chore: bump version to 1.0.10

.editorconfig

@@ -0,0 +1,55 @@
+# EditorConfig is awesome: https://editorconfig.org
+root = true
+
+# -------------------------------------------------
+# General settings – apply to all files
+# -------------------------------------------------
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# -------------------------------------------------
+# Markdown (*.md)
+# -------------------------------------------------
+[*.md]
+max_line_length = off        # Markdown lines can be long
+trim_trailing_whitespace = false   # Preserve intentional spaces
+
+# -------------------------------------------------
+# Go (*.go)
+# -------------------------------------------------
+[*.go]
+indent_style = tab
+indent_size = 4
+trim_trailing_whitespace = true
+max_line_length = 100
+
+# -------------------------------------------------
+# JavaScript & TypeScript (*.js, *.jsx, *.ts, *.tsx)
+# -------------------------------------------------
+[*.{js,jsx,ts,tsx}]
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 120
+
+# -------------------------------------------------
+# HTML (*.html, *.htm)
+# -------------------------------------------------
+[*.{html,htm}]
+indent_style = space
+indent_size = 2
+max_line_length = 120
+trim_trailing_whitespace = true
+
+# -------------------------------------------------
+# CSS & SCSS (*.css, *.scss)
+# -------------------------------------------------
+[*.{css,scss}]
+indent_style = space
+indent_size = 2
+max_line_length = 120
+trim_trailing_whitespace = true

.gitea/workflows/cd.yml

@@ -48,7 +48,7 @@ jobs:
           DOCKER_HOST: tcp://192.168.88.40:2375
         run: |
           docker run --rm \
-            -v prometheus-config:/etc/prometheus \
+            -v linearvoid_prometheus-config:/etc/prometheus \
             alpine:latest sh -c '
               cat > /etc/prometheus/prometheus.yml << "PROMEOF"
           global:
@@ -113,6 +113,20 @@ jobs:
                     severity: warning
                   annotations:
                     summary: "Playout in slate fallback"
+                - alert: HighChatLatency
+                  expr: rate(linearvoid_chat_messages_total[5m]) < 0.01
+                  for: 5m
+                  labels:
+                    severity: warning
+                  annotations:
+                    summary: "Unusually low chat message rate"
+                - alert: PrometheusWALFailing
+                  expr: increase(prometheus_tsdb_wal_writes_failed_total[5m]) > 0
+                  for: 5m
+                  labels:
+                    severity: warning
+                  annotations:
+                    summary: "Prometheus WAL writes failing"
                 - alert: HighCPU
                   expr: 100 - (avg by (instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
                   for: 10m
@@ -130,6 +144,66 @@ jobs:
           ALERTSEOF
             '
 
+      - name: Seed Grafana provisioning on remote host
+        env:
+          DOCKER_HOST: tcp://192.168.88.40:2375
+        run: |
+          docker run --rm \
+            -v linearvoid_grafana-provisioning:/etc/grafana/provisioning \
+            alpine:latest sh -c '
+              mkdir -p /etc/grafana/provisioning/datasources /etc/grafana/provisioning/dashboards
+              cat > /etc/grafana/provisioning/datasources/datasource.yml << "DSEOF"
+          apiVersion: 1
+          datasources:
+            - name: Prometheus
+              type: prometheus
+              access: proxy
+              url: http://prometheus:9090
+              isDefault: true
+              editable: true
+          DSEOF
+              cat > /etc/grafana/provisioning/dashboards/dashboard.yml << "PROVEOF"
+          apiVersion: 1
+          providers:
+            - name: "default"
+              orgId: 1
+              folder: ""
+              type: file
+              disableDeletion: false
+              updateIntervalSeconds: 10
+              allowUiUpdates: true
+              options:
+                path: /etc/grafana/provisioning/dashboards
+          PROVEOF
+              cat > /etc/grafana/provisioning/dashboards/linearvoid-app.json << "DBEOF"
+          {
+            "title": "Linear Void Monitoring",
+            "panels": [
+              {
+                "title": "Concurrent Viewers",
+                "type": "timeseries",
+                "targets": [{ "expr": "linearvoid_chat_connected_clients" }]
+              },
+              {
+                "title": "Stored Messages",
+                "type": "stat",
+                "targets": [{ "expr": "linearvoid_chat_messages_total" }]
+              },
+              {
+                "title": "Redis Reachable",
+                "type": "stat",
+                "targets": [{ "expr": "linearvoid_chat_redis_up" }]
+              },
+              {
+                "title": "Playout Mode",
+                "type": "stat",
+                "targets": [{ "expr": "linearvoid_playout_mode" }]
+              }
+            ]
+          }
+          DBEOF
+            '
+
       - name: Deploy with docker-compose
         env:
           DOCKER_HOST: tcp://192.168.88.40:2375

.gitea/workflows/ci.yml

@@ -43,7 +43,17 @@ jobs:
         run: cd backend/chat && GOTOOLCHAIN=local go vet ./...
 
       - name: Run Tests
-        run: echo "Tests will be added in future CI steps"
+        run: cd backend/chat && GOTOOLCHAIN=local go test ./... -v -cover -coverprofile=coverage.out -race
+
+      - name: Check Coverage
+        run: |
+          cd backend/chat
+          COVERAGE=$(GOTOOLCHAIN=local go tool cover -func=coverage.out | grep total | awk '{print $3}' | sed 's/%//')
+          echo "Coverage: $COVERAGE%"
+          if [ "$(echo "$COVERAGE < 50" | bc)" -eq 1 ]; then
+            echo "Coverage $COVERAGE% below 50% threshold"
+            exit 1
+          fi
 
   docker:
     needs: test

.gitignore

@@ -7,6 +7,10 @@
 .env.local
 .env.*.local
 
+# Test coverage
+coverage
+coverage.out
+
 # Logs
 logs
 *.log
@@ -41,6 +45,7 @@ out/
 # FFmpeg temporary files
 *.ts.tmp
 *.m3u8.tmp
+*.m4s.tmp
 hls/
 temp/
 
@@ -79,10 +84,9 @@ Thumbs.db
 .terraform/
 
 # Agent / Tool files
-.github/instructions/TODO.md
+.github/agents/
-.github/instructions/DONE.md
+.github/instructions/
-.github/instructions/BACKLOG.md
+.github/MEMORY.md
-# (keep AGENTS.md, MEMORY.md, and other instruction files)
 
 # Temporary architecture artifacts
 **/*.tmp

.prettierignore

@@ -0,0 +1,95 @@
+# =============================================
+# Linear Void .prettierignore
+# =============================================
+
+# Dependencies
+node_modules/
+
+# Build outputs
+dist/
+build/
+out/
+*.min.js
+
+# Test coverage
+coverage/
+coverage.out
+
+# Go source (handled by gofmt, not prettier)
+*.go
+go.mod
+go.sum
+
+# Binary / compiled
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Media files
+*.m4s
+*.m3u8
+*.ts.tmp        # FFmpeg temp, not TypeScript
+*.m3u8.tmp
+*.png
+*.jpg
+*.jpeg
+*.gif
+*.svg
+*.ico
+*.webp
+*.mp4
+*.webm
+*.mp3
+*.ogg
+
+# Runtime data
+data/
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Databases
+*.db
+*.sqlite
+*.sqlite3
+
+# Lockfile (auto-generated, don't reformat)
+package-lock.json
+
+# Shell scripts (prettier doesn't handle sh)
+*.sh
+
+# Environment & secrets
+.env
+.env.*
+!.env.example
+
+# Logs
+*.log
+
+# Editor & IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Git
+.git/
+
+# Terraform / IaC
+*.tfstate
+*.tfstate.backup
+.terraform/
+
+# Temp & backup files
+**/*.tmp
+**/*.bak
+
+# Docker
+.dockerignore

CHANGELOG.md

@@ -16,10 +16,15 @@
 - **CI pipeline**: Removed redundant `release` job (handled by `release.yml`).
 - **Tag format**: Standardized on `*.*.*` (e.g. `1.0.9`), removed `v` prefix from existing tags.
 - **DEPLOYMENT.md**: Documented parallel CI/CD pipeline flow with workflow table.
+- **Runtime checks**: Executed normalization edge-case tests (MOV, MKV, VFR, 5.1 input) and concat continuity verification in running playout environment.
+- **Incident runbook**: Added quarterly disaster recovery drill procedure with prerequisites, outage simulation, restore validation, and evidence template.
+- **Manual ops checklist**: Added `docs/operations/cloudflare-uptimerobot-checklist.md` to execute and record Cloudflare + UptimeRobot dashboard tasks with evidence capture.
+- **Scaling playbook**: Added `docs/operations/scaling-performance-playbook.md` with benchmark methods, trigger thresholds, and Phase 2/3 scaling decision flow.
 
 ### Fixed
 
 - **Prometheus config mount**: Switched prod from bind mounts to named volume `prometheus-config`, populated via `docker run` on remote host. Fixes `not a directory` error when bind source path doesn't exist on deployment host.
+- **Viewer mobile overflow**: Replaced `100vw` with `100%` on full-screen viewer containers to remove horizontal overflow on mobile viewports.
 
 ### Removed
 

DEVELOPMENT.md

@@ -0,0 +1,93 @@
+# DEVELOPMENT.md — Linear Void Remaining Tasks
+
+> Auto-generated 2026-08-07. All completed items moved to `.github/instructions/DONE.md`.
+
+## Test Fixtures (BLOCKED — requires ffmpeg)
+
+- [ ] Create test media fixtures in `backend/playout/testdata/`:
+  - `valid_720p30.mp4` — small (1-2s) H.264/AAC compliant file
+  - `invalid_h265.mp4` — wrong codec
+  - `invalid_24fps.mp4` — wrong framerate
+  - Generate via `ffmpeg` commands documented in test file headers
+
+- [ ] Create test playlist fixtures in `backend/playout/testdata/`:
+  - `valid_playlist.txt`, `empty_playlist.txt`, `comments_only.txt`, `mixed_valid_invalid.txt`
+
+## User Frontend Tests
+
+- [ ] Video player behavior (play, pause, seek, buffering, error handling)
+- [ ] Chat functionality (send/receive messages, presence, rate limiting, moderation)
+- [ ] State management and data flow
+- [ ] Responsive design and layout across different screen sizes
+- [ ] Accessibility testing (keyboard navigation, screen reader support)
+- [ ] Integration with backend APIs (mocking API responses for testing)
+- [ ] Test coverage for all critical frontend components and interactions
+- [ ] Add code coverage reporting and enforce minimum coverage threshold in CI/CD pipeline
+- [ ] Document test cases and expected outcomes
+
+## Admin Frontend Tests
+
+- [ ] Playlist management UI (add/remove videos, reorder, normalize)
+- [ ] User moderation tools (mute/ban/report users, view moderation logs)
+- [ ] Metrics and monitoring dashboards (Prometheus/Grafana integration)
+- [ ] State management and data flow
+- [ ] Responsive design and layout across different screen sizes
+- [ ] Accessibility testing (keyboard navigation, screen reader support)
+- [ ] Integration with backend APIs (mocking API responses for testing)
+- [ ] Test coverage for all critical admin UI components and interactions
+- [ ] Add code coverage reporting and enforce minimum coverage threshold in CI/CD pipeline
+- [ ] Document test cases and expected outcomes
+
+## Cloudflare R2 Integration Test
+
+- [ ] Upload test HLS segments and manifests to R2 bucket
+- [ ] Verify correct cache headers are applied (immutable segments, TTLs)
+- [ ] Test retrieval of segments and manifests from R2 via Cloudflare edge
+- [ ] Validate cache hit/miss behavior and performance metrics
+- [ ] Ensure integration test can run in CI/CD pipeline with proper mocking/stubbing of R2 API
+- [ ] Document test cases and expected outcomes
+
+## Cloudflare Configuration (manual — Cloudflare dashboard)
+
+> Evidence tracker: `docs/operations/cloudflare-uptimerobot-checklist.md`
+
+- [ ] Cloudflare Pages: link Gitea repo, build `cd frontend && npm run build`, output `frontend/dist`
+- [ ] Tiered Cache: enable Smart Tiered Cache, validate `Cf-Cache-Status: HIT` from upper tier
+- [ ] WAF: enable OWASP Managed Ruleset, set to Simulate → review 48h → Block, enable Bot Fight Mode
+- [ ] Rate limiting: `/api/admin/login` + `/api/admin/*` → 10 req/10s per IP, Challenge action
+- [ ] HTTPS/WSS: Always Use HTTPS, HSTS max-age=31536000 includeSubDomains preload, min TLS 1.2
+- [ ] HTTPS/WSS: enforce at edge (Cloudflare) and origin (nginx), redirect HTTP → HTTPS
+
+## External Services
+
+> Evidence tracker: `docs/operations/cloudflare-uptimerobot-checklist.md`
+
+- [ ] UptimeRobot: add HTTP monitor for `https://linearvoid.tv/health` (5min interval)
+- [ ] UptimeRobot: add keyword monitor for `https://linearvoid.tv/hls/playlist.m3u8` (keyword: `#EXTM3U`, 5min)
+- [ ] Alert on 2 consecutive failures, notify via email + Discord/Slack webhook
+
+## Production Deployment (Hetzner — not provisioned)
+
+- [ ] Provision Hetzner CX22 (2 vCPU, 4 GB, 40 GB) in Ashburn VA, Ubuntu 24.04
+- [ ] Install Docker Engine + Compose plugin, open firewall: 80/443 (public), 2375 (runner IP only)
+- [ ] Configure Docker daemon for remote TLS access (`-H tcp://0.0.0.0:2376` with certs)
+- [ ] Create `/srv/linearvoid/data/{playlist,media,hls,chat,slate}` directories
+- [ ] Add `CI_PROD_*` secrets to Gitea: DOCKER_HOST, R2 keys, admin password, DB password, Grafana password
+- [ ] Trigger CD workflow with `DOCKER_HOST` pointing to Hetzner IP
+- [ ] Verify all 11 containers start healthy, check `/health`, `/hls/playlist.m3u8`, WebSocket
+- [ ] Update Cloudflare A record `linearvoid.tv` → Hetzner IP, SSL Full (strict), test HTTPS + WSS
+- [ ] Smoke test: viewer SPA loads, HLS plays, chat connects, admin login → upload → playlist → playout
+- [ ] Set up Prometheus alerting notifications + UptimeRobot on production URL
+- [ ] Run `scripts/backup-db.sh` + `scripts/verify-backups.sh` on production host
+- [ ] Document production IP, SSH access, rollback procedure, scaling thresholds
+
+## Scaling & Performance (planning only)
+
+- [ ] Tune manifest TTL: measure `Cf-Cache-Status` distribution, adjust to 0.5× segment duration
+- [ ] Measure TTFB: WebPageTest from 3+ US regions, target <4s warm cache, document baseline
+- [ ] Load-test WebSocket: `artillery` or Go script, ramp 10→100→500→1000 connections, measure p95 latency + errors
+- [ ] Benchmark admin API: `wrk`/`k6` against `/api/admin/*`, target p95 <1s, identify slow queries
+- [ ] Track cache hit ratio: Cloudflare GraphQL → Grafana panel, alert <90%
+- [ ] Capacity triggers: Prometheus rules for cache-miss >10%/15min, chat p95 >1s/5min, CPU >80%/10min
+- [ ] Phase 2 plan: document boundaries (playout CPU, chat latency, DB state, monitoring), estimate per-service resources
+- [ ] Phase 3 plan: research second Hetzner location, design warm standby + DNS failover + DB/Redis replication

README.md

@@ -7,7 +7,7 @@
 [![Build Status](https://git.allucanget.biz/zwitschi/linearvoid/actions/workflows/ci.yml/badge.svg)](https://git.allucanget.biz/zwitschi/linearvoid/actions)
 [![License](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
 [![Gitea](https://img.shields.io/badge/Gitea-1.27.1-blue)](https://git.allucanget.biz)
-[![Version](https://img.shields.io/badge/version-1.0.9-blue)](https://git.allucanget.biz/zwitschi/linearvoid/releases)
+[![Version](https://img.shields.io/badge/version-1.0.10-blue)](https://git.allucanget.biz/zwitschi/linearvoid/releases)
 [![Release Notes](https://img.shields.io/badge/release-notes-green)](CHANGELOG.md)
 
 ## Architecture
@@ -15,7 +15,7 @@
 The architecture (detailed in [`docs/architecture/README.md`](docs/architecture/README.md)) uses:
 
 - Hetzner Ashburn VPS for playout (FFmpeg + MediaMTX/SRS) and chat _(planned production; currently test lab at 192.168.88.40)_.
-- Cloudflare R2 + CDN with aggressive immutable caching of HLS `.ts` segments ($0 egress).
+- Cloudflare R2 + CDN with aggressive immutable caching of `.m4s` segments ($0 egress).
 - Lightweight static frontend and WebSocket chat backend.
 - Gitea self-hosted CI/CD (Actions) and Container Registry.
 
@@ -211,6 +211,7 @@ Contributions, issues, and further evolution (LL-HLS, ABR, multi-channel, E2EE)
 - [DEPLOYMENT.md](DEPLOYMENT.md) - Production deployment and operations guide.
 - [MONITORING.md](MONITORING.md) - Prometheus and Grafana setup and troubleshooting.
 - [SECURITY.md](SECURITY.md) - Security controls, hardening checklist, and incident baseline.
+- [Scaling Playbook](docs/operations/scaling-performance-playbook.md) - Performance test method, thresholds, and scaling decision flow.
 - [Architecture Documentation](docs/architecture/README.md) - Full arc42 template with diagrams and decisions.
 - [ADRs](docs/architecture/adr/) - Detailed decision records (ADR-001 to ADR-007).
 
@@ -227,7 +228,7 @@ Contributions are welcome! See [`CONTRIBUTING.md`](CONTRIBUTING.md) for guidelin
 3. Open PRs on [Gitea](https://git.allucanget.biz/zwitschi/linearvoid).
 4. CI validates builds and tests automatically.
 
-Since this a linear project, we also rely on a linear development and release model: Only main branch is used for releases, and all features are merged into main after review and CI validation. Releases are tagged with semantic versioning (1.0.3, 1.0.4, etc.) and automatically built/pushed to the container registry. Version numbers are declared in `frontend/package.json`, `CHANGELOG.md`, and the version badge in this README. For patches, we use even numbers for stable versions (1.0.2, 1.0.4) and odd numbers for pre-release/unstable versions (1.0.3, 1.0.5).
+Since this is a linear project, we also rely on a linear development and release model: only `main` branch is used for releases, and all features are merged into `main` after review and CI validation. Releases use semantic version tags in `*.*.*` format (for example `1.0.9`) and are automatically built/pushed to the container registry. Version numbers are declared in `frontend/package.json`, `CHANGELOG.md`, and the version badge in this README.
 
 [MIT License](LICENSE)
 

SETUP.md

@@ -162,39 +162,6 @@ flowchart LR
    - Place normalized MP4 files in `data/media/`.
    - Create a `data/playlist/playlist.txt` with paths (see ADR-001 for normalization requirements).
 
-## Cloudflare R2 Setup
-
-1. **Create an R2 bucket**:
-   - Create a bucket such as `linearvoid-media` in Cloudflare R2.
-   - Keep the bucket name aligned with `R2_BUCKET_NAME` in `.env`.
-
-2. **Generate R2 API credentials**:
-   - Create an access key pair with read/write permissions for the bucket.
-   - Set `R2_ACCESS_KEY_ID`, `R2_SECRET_ACCESS_KEY`, and `R2_REGION=auto` in `.env`.
-
-3. **Find the S3 endpoint**:
-   - Use the account-scoped endpoint format `https://<account-id>.r2.cloudflarestorage.com`.
-   - Store the account ID in both `R2_ENDPOINT` and `CLOUDFLARE_ACCOUNT_ID` where applicable.
-
-4. **Bind a custom media domain**:
-   - Attach a domain such as `media.linearvoid.tv` to the bucket.
-   - Set `MEDIA_DOMAIN` to that hostname.
-
-5. **Configure app-domain DNS and TLS**:
-   - Point `linearvoid.tv` to the public entrypoint serving nginx.
-   - Point `www.linearvoid.tv` to the same target and redirect it to `https://linearvoid.tv`.
-   - Keep `media.linearvoid.tv` on the R2 custom domain path so HLS delivery stays split from the app origin.
-   - Use Cloudflare proxied DNS with Full (strict) TLS so browser traffic uses `https://linearvoid.tv`, `wss://linearvoid.tv/ws`, and `https://media.linearvoid.tv`.
-
-6. **Apply cache behavior**:
-   - Configure the `.ts` and `.m3u8` cache rules from `infrastructure/cloudflare/cache-rules.md`.
-   - Enable Smart Tiered Cache for the R2-backed hostname.
-   - If you need header normalization for immutable segment caching, deploy `infrastructure/cloudflare/worker.js` to the same zone.
-
-7. **Verify access**:
-   - Confirm uploads with an S3-compatible client such as `aws s3 ls --endpoint-url <R2_ENDPOINT>`.
-   - After deployment, check Cloudflare analytics for cache hit ratio and origin request volume.
-
 ## Gitea Setup
 
 1. **Create or verify a Gitea user**:
@@ -231,6 +198,160 @@ flowchart LR
 7. **Validate image availability**:
    - Before a production rollout, verify that the expected `:latest` tags can be pulled from the registry on the target server.
 
+## Cloudflare R2 Setup
+
+1. **Create an R2 bucket**:
+   - Create a bucket such as `linearvoid-media` in Cloudflare R2.
+   - Keep the bucket name aligned with `R2_BUCKET_NAME` in `.env`.
+
+2. **Generate R2 API credentials**:
+   - Create an access key pair with read/write permissions for the bucket.
+   - Set `R2_ACCESS_KEY_ID`, `R2_SECRET_ACCESS_KEY`, and `R2_REGION=auto` in `.env`.
+
+3. **Find the S3 endpoint**:
+   - Use the account-scoped endpoint format `https://<account-id>.r2.cloudflarestorage.com`.
+   - Store the account ID in both `R2_ENDPOINT` and `CLOUDFLARE_ACCOUNT_ID` where applicable.
+
+4. **Bind a custom media domain**:
+   - Attach a domain such as `media.linearvoid.tv` to the bucket.
+   - Set `MEDIA_DOMAIN` to that hostname.
+
+5. **Configure app-domain DNS and TLS**:
+   - Point `linearvoid.tv` to the public entrypoint serving nginx.
+   - Point `www.linearvoid.tv` to the same target and redirect it to `https://linearvoid.tv`.
+   - Keep `media.linearvoid.tv` on the R2 custom domain path so HLS delivery stays split from the app origin.
+   - Use Cloudflare proxied DNS with Full (strict) TLS so browser traffic uses `https://linearvoid.tv`, `wss://linearvoid.tv/ws`, and `https://media.linearvoid.tv`.
+
+6. **Apply cache behavior**:
+   - Configure the `.m4s` and `.m3u8` cache rules from `infrastructure/cloudflare/cache-rules.md`.
+   - Enable Smart Tiered Cache for the R2-backed hostname.
+   - If you need header normalization for immutable segment caching, deploy `infrastructure/cloudflare/worker.js` to the same zone.
+
+7. **Verify access**:
+   - Confirm uploads with an S3-compatible client such as `aws s3 ls --endpoint-url <R2_ENDPOINT>`.
+   - After deployment, check Cloudflare analytics for cache hit ratio and origin request volume.
+
+## Cloudflare
+
+Use this section for full edge setup (DNS, Pages, cache, security, and monitoring).
+
+Execution tracker: `docs/operations/cloudflare-uptimerobot-checklist.md`.
+
+### 1. DNS Setup
+
+1. Add apex record for `linearvoid.tv` pointing to Cloudflare Pages target.
+2. Add `www` CNAME to Cloudflare Pages and configure redirect to `https://linearvoid.tv`.
+3. Add `media.linearvoid.tv` for split-domain HLS delivery.
+4. Keep all records proxied (orange cloud) unless troubleshooting requires DNS-only mode.
+
+### 2. R2 Bucket
+
+1. Create bucket `linearvoid-media`.
+2. Set location hint to `enam` (US-East).
+3. Attach custom domain `media.linearvoid.tv` to the bucket.
+4. Verify object read works from the custom domain.
+
+### 3. Cache Rules
+
+Configure Cloudflare Cache Rules:
+
+1. HLS segment files (`*.ts`, `*.m4s`):
+   - Cache: eligible
+   - Edge TTL: `31536000`
+   - Browser TTL: long-lived
+   - Cache key: include full path
+2. HLS manifests (`*.m3u8`):
+   - Cache: eligible
+   - Edge TTL: `2s`
+   - Revalidation: enabled
+3. Static assets (`*.js`, `*.css`):
+   - Cache: eligible
+   - Edge TTL: `1y`
+   - Browser TTL: long-lived
+   - Cache key: include full path
+4. Validate behavior using response headers:
+   - `Cf-Cache-Status` should move from `MISS` to `HIT` for hot objects
+
+Reference: `infrastructure/cloudflare/cache-rules.md`.
+
+### 4. Cloudflare Pages
+
+1. Connect Gitea repository to Cloudflare Pages.
+2. Build command:
+
+   ```bash
+   cd frontend && npm run build
+   ```
+
+3. Output directory:
+
+   ```text
+   frontend/dist
+   ```
+
+4. Configure production domain to `linearvoid.tv`.
+
+### 5. Tiered Cache
+
+1. Enable Smart Tiered Cache in Cloudflare dashboard.
+2. Warm a segment and manifest path.
+3. Confirm tiered behavior through repeated requests and `Cf-Cache-Status: HIT`.
+
+### 6. WAF and Bot Protection
+
+1. Enable OWASP Managed Ruleset.
+2. Start in `Simulate` mode.
+3. Review events for 48 hours.
+4. Switch to `Block` once false positives are addressed.
+5. Enable Bot Fight Mode.
+
+### 7. Rate Limiting
+
+Create rules:
+
+1. Path: `/api/admin/login`
+2. Path: `/api/admin/*`
+3. Threshold: `10 requests / 10 seconds / IP`
+4. Action: `Managed Challenge`
+
+### 8. HTTPS and WSS
+
+1. Enable `Always Use HTTPS`.
+2. Enable HSTS with:
+   - `max-age=31536000`
+   - `includeSubDomains`
+   - `preload`
+3. Minimum TLS version: `1.2`.
+4. Keep SSL mode at `Full (strict)` when origin certs are valid.
+5. Enforce HTTPS redirect at both layers:
+   - Cloudflare edge
+   - nginx origin
+6. Validate websocket endpoint uses `wss://linearvoid.tv/ws`.
+
+### 9. UptimeRobot Monitors
+
+Create external monitors:
+
+1. HTTP monitor:
+   - URL: `https://linearvoid.tv/health`
+   - Interval: 5 minutes
+2. Keyword monitor:
+   - URL: `https://linearvoid.tv/hls/playlist.m3u8`
+   - Keyword: `#EXTM3U`
+   - Interval: 5 minutes
+3. Alert policy:
+   - Trigger on 2 consecutive failures
+   - Notify via email and Discord/Slack webhook
+
+### 10. Verification Checklist
+
+1. DNS resolves for `linearvoid.tv`, `www.linearvoid.tv`, and `media.linearvoid.tv`.
+2. Pages serves frontend for apex and `www` redirects correctly.
+3. HLS segments are cacheable long-term, manifests refresh every ~2s.
+4. Admin paths are rate-limited and WAF events are visible.
+5. HTTPS and WSS both succeed with valid certificates.
+6. UptimeRobot alerts fire as expected when endpoints are intentionally made unavailable.
+
 ## Running the Application
 
 ### Local Development
@@ -450,7 +571,7 @@ See `docs/architecture/README.md` for the full arc42 documentation and the ADRs
 - **R2 Upload Fails**: Check credentials in `.env` and ensure the bucket exists. Verify with `aws s3 ls --endpoint-url=$R2_ENDPOINT`.
 - **Normalization Errors**: Run `backend/playout/start-playout.sh` manually to see ffprobe output. All videos must be H.264/AAC, 30 fps constant, 2s keyframes (ADR-001).
 - **Chat Not Connecting**: Check Redis connection and WebSocket URL. The health check at `/health` should return 200.
-- **Cache Not Working**: Verify Cloudflare cache rules (`.ts` = long TTL immutable, `.m3u8` = short TTL). Check cache hit ratio in Cloudflare dashboard.
+- **Cache Not Working**: Verify Cloudflare cache rules (`.m4s` = long TTL immutable, `.m3u8` = short TTL). Check cache hit ratio in Cloudflare dashboard.
 - **Docker Issues**: Run `docker compose logs` for service-specific errors. Ensure ports are not in use.
 - **Admin Interface**: Ensure `ADMIN_USERNAME`, `ADMIN_PASSWORD`, and `ADMIN_SESSION_TTL_HOURS` are set. `/admin/` and `/api/admin/*` are protected by a session-based login flow.
 - **Production Pull Fails**: Confirm `docker login` to Gitea succeeded on the server and the image tags referenced by `docker-compose.prod.yml` exist.

backend/chat/go.mod

@@ -3,24 +3,33 @@ module chat
 go 1.25.0
 
 require (
+	github.com/glebarez/sqlite v1.11.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/redis/go-redis/v9 v9.7.0
 	gorm.io/driver/postgres v1.5.11
-	gorm.io/driver/sqlite v1.5.7
 	gorm.io/gorm v1.25.12
 )
 
 require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/glebarez/go-sqlite v1.21.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/pgx/v5 v5.7.5 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/mattn/go-sqlite3 v1.14.22 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	golang.org/x/crypto v0.37.0 // indirect
 	golang.org/x/sync v0.13.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.24.0 // indirect
+	modernc.org/libc v1.22.5 // indirect
+	modernc.org/mathutil v1.5.0 // indirect
+	modernc.org/memory v1.5.0 // indirect
+	modernc.org/sqlite v1.23.1 // indirect
 )

backend/chat/go.sum

@@ -9,6 +9,16 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/glebarez/go-sqlite v1.21.2 h1:3a6LFC4sKahUunAmynQKLZceZCOzUthkRkEAl9gAXWo=
+github.com/glebarez/go-sqlite v1.21.2/go.mod h1:sfxdZyhQjTM2Wry3gVYWaW072Ri1WMdWJi0k6+3382k=
+github.com/glebarez/sqlite v1.11.0 h1:wSG0irqzP6VurnMEpFGer5Li19RpIRi2qvQz++w0GMw=
+github.com/glebarez/sqlite v1.11.0/go.mod h1:h8/o8j5wiAsqSPoWELDUdJXhjAhsVliSn7bWZjOhrgQ=
+github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
+github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26/go.mod h1:dDKJzRmX4S37WGHujM7tX//fmj1uioxKzKxz3lo4HJo=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -23,12 +33,15 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
-github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/redis/go-redis/v9 v9.7.0 h1:HhLSs+B6O021gwzl+locl0zEDnyNkxMtf/Z3NNBMa9E=
 github.com/redis/go-redis/v9 v9.7.0/go.mod h1:f6zhXITC7JUJIlPEiBOTXxJgPLdZcA93GewI7inzyWw=
+github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -38,6 +51,9 @@ golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
 golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
 golang.org/x/sync v0.13.0 h1:AauUjRAJ9OSnvULf/ARrrVywoJDy0YS2AwQ98I37610=
 golang.org/x/sync v0.13.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/text v0.24.0 h1:dd5Bzh4yt5KYA8f9CJHCP4FB4D51c2c6JvN37xJJkJ0=
 golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -46,7 +62,13 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gorm.io/driver/postgres v1.5.11 h1:ubBVAfbKEUld/twyKZ0IYn9rSQh448EdelLYk9Mv314=
 gorm.io/driver/postgres v1.5.11/go.mod h1:DX3GReXH+3FPWGrrgffdvCk3DQ1dwDPdmbenSkweRGI=
-gorm.io/driver/sqlite v1.5.7 h1:8NvsrhP0ifM7LX9G4zPB97NwovUakUxc+2V2uuf3Z1I=
-gorm.io/driver/sqlite v1.5.7/go.mod h1:U+J8craQU6Fzkcvu8oLeAQmi50TkwPEhHDEjQZXDah4=
 gorm.io/gorm v1.25.12 h1:I0u8i2hWQItBq1WfE0o2+WuL9+8L21K9e2HHSTE/0f8=
 gorm.io/gorm v1.25.12/go.mod h1:xh7N7RHfYlNc5EmcI/El95gXusucDrQnHXe0+CgWcLQ=
+modernc.org/libc v1.22.5 h1:91BNch/e5B0uPbJFgqbxXuOnxBQjlS//icfQEGmvyjE=
+modernc.org/libc v1.22.5/go.mod h1:jj+Z7dTNX8fBScMVNRAYZ/jF91K8fdT2hYMThc3YjBY=
+modernc.org/mathutil v1.5.0 h1:rV0Ko/6SfM+8G+yKiyI830l3Wuz1zRutdslNoQ0kfiQ=
+modernc.org/mathutil v1.5.0/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/memory v1.5.0 h1:N+/8c5rE6EqugZwHii4IFsaJ7MUhoWX07J5tC/iI5Ds=
+modernc.org/memory v1.5.0/go.mod h1:PkUhL0Mugw21sHPeskwZW4D6VscE/GQJOnIpCnW6pSU=
+modernc.org/sqlite v1.23.1 h1:nrSBg4aRQQwq59JpvGEQ15tNxoO5pX/kUjcRNwSAGQM=
+modernc.org/sqlite v1.23.1/go.mod h1:OrDj17Mggn6MhE+iPbBNf7RGKODDE9NFT0f3EwDzJqk=

backend/chat/src/auth/auth.go

@@ -0,0 +1,140 @@
+package auth
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+)
+
+// SessionStore manages admin authentication sessions.
+type SessionStore struct {
+	mu       sync.Mutex
+	sessions map[string]time.Time
+}
+
+// NewSessionStore creates a new session store.
+func NewSessionStore() *SessionStore {
+	return &SessionStore{
+		sessions: make(map[string]time.Time),
+	}
+}
+
+// GenerateToken creates a cryptographically random 64-char hex session token.
+func GenerateToken() (string, error) {
+	buf := make([]byte, 32)
+	if _, err := rand.Read(buf); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(buf), nil
+}
+
+// Validate checks if a session token is valid and not expired.
+// Returns true if valid, false otherwise. Expired sessions are cleaned up.
+func (s *SessionStore) Validate(token string) bool {
+	if token == "" {
+		return false
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	expiresAt, ok := s.sessions[token]
+	if !ok {
+		return false
+	}
+	if time.Now().After(expiresAt) {
+		delete(s.sessions, token)
+		return false
+	}
+	return true
+}
+
+// Add stores a session token with expiry.
+func (s *SessionStore) Add(token string, expiresAt time.Time) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.sessions[token] = expiresAt
+}
+
+// Remove deletes a session token.
+func (s *SessionStore) Remove(token string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	delete(s.sessions, token)
+}
+
+// CountActive returns the number of unexpired sessions.
+func (s *SessionStore) CountActive() int {
+	now := time.Now()
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for token, expiresAt := range s.sessions {
+		if now.After(expiresAt) {
+			delete(s.sessions, token)
+		}
+	}
+	return len(s.sessions)
+}
+
+// CookieSecure determines if the session cookie should have Secure flag.
+func CookieSecure(r *http.Request) bool {
+	if forwardedProto := strings.TrimSpace(r.Header.Get("X-Forwarded-Proto")); forwardedProto != "" {
+		return strings.EqualFold(forwardedProto, "https")
+	}
+	return r.TLS != nil
+}
+
+// SetCookie writes the admin session cookie.
+func SetCookie(w http.ResponseWriter, r *http.Request, cookieName, token string, expiresAt time.Time) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     cookieName,
+		Value:    token,
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteStrictMode,
+		Secure:   CookieSecure(r),
+		Expires:  expiresAt,
+		MaxAge:   int(time.Until(expiresAt).Seconds()),
+	})
+}
+
+// ClearCookie removes the admin session cookie.
+func ClearCookie(w http.ResponseWriter, r *http.Request, cookieName string) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     cookieName,
+		Value:    "",
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteStrictMode,
+		Secure:   CookieSecure(r),
+		Expires:  time.Unix(0, 0),
+		MaxAge:   -1,
+	})
+}
+
+// GetTokenFromCookie extracts the session token from the request cookie.
+func GetTokenFromCookie(r *http.Request, cookieName string) (string, bool) {
+	cookie, err := r.Cookie(cookieName)
+	if err != nil || cookie.Value == "" {
+		return "", false
+	}
+	return cookie.Value, true
+}
+
+// RequireAdmin returns middleware that checks for a valid admin session.
+func RequireAdmin(store *SessionStore, cookieName string) func(http.HandlerFunc) http.HandlerFunc {
+	return func(next http.HandlerFunc) http.HandlerFunc {
+		return func(w http.ResponseWriter, r *http.Request) {
+			token, ok := GetTokenFromCookie(r, cookieName)
+			if !ok || !store.Validate(token) {
+				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				return
+			}
+			next(w, r)
+		}
+	}
+}

backend/chat/src/auth/auth_test.go

@@ -0,0 +1,248 @@
+package auth
+
+import (
+	"crypto/tls"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+)
+
+func TestGenerateToken(t *testing.T) {
+	token, err := GenerateToken()
+	if err != nil {
+		t.Fatalf("GenerateToken() error = %v", err)
+	}
+	if len(token) != 64 {
+		t.Errorf("GenerateToken() length = %d, want 64", len(token))
+	}
+
+	// Uniqueness check
+	tokens := make(map[string]bool)
+	for i := 0; i < 1000; i++ {
+		tok, err := GenerateToken()
+		if err != nil {
+			t.Fatalf("GenerateToken() iteration %d error = %v", i, err)
+		}
+		if tokens[tok] {
+			t.Errorf("GenerateToken() produced duplicate token at iteration %d", i)
+		}
+		tokens[tok] = true
+	}
+}
+
+func TestSessionStore_Validate(t *testing.T) {
+	store := NewSessionStore()
+
+	// Empty token
+	if store.Validate("") {
+		t.Error("Validate(\"\") = true, want false")
+	}
+
+	// Missing token
+	if store.Validate("nonexistent") {
+		t.Error("Validate(\"nonexistent\") = true, want false")
+	}
+
+	// Valid token
+	token, _ := GenerateToken()
+	store.Add(token, time.Now().Add(1*time.Hour))
+	if !store.Validate(token) {
+		t.Error("Validate(valid) = false, want true")
+	}
+
+	// Expired token
+	expiredToken, _ := GenerateToken()
+	store.Add(expiredToken, time.Now().Add(-1*time.Hour))
+	if store.Validate(expiredToken) {
+		t.Error("Validate(expired) = true, want false")
+	}
+
+	// Expired token should be cleaned up
+	if store.Validate(expiredToken) {
+		t.Error("Validate(expired) second call = true, want false (should be cleaned)")
+	}
+}
+
+func TestSessionStore_AddRemove(t *testing.T) {
+	store := NewSessionStore()
+	token, _ := GenerateToken()
+
+	store.Add(token, time.Now().Add(1*time.Hour))
+	if !store.Validate(token) {
+		t.Error("Validate after Add = false, want true")
+	}
+
+	store.Remove(token)
+	if store.Validate(token) {
+		t.Error("Validate after Remove = true, want false")
+	}
+}
+
+func TestSessionStore_CountActive(t *testing.T) {
+	store := NewSessionStore()
+
+	if count := store.CountActive(); count != 0 {
+		t.Errorf("CountActive() = %d, want 0", count)
+	}
+
+	t1, _ := GenerateToken()
+	t2, _ := GenerateToken()
+	t3, _ := GenerateToken()
+
+	store.Add(t1, time.Now().Add(1*time.Hour))
+	store.Add(t2, time.Now().Add(1*time.Hour))
+	store.Add(t3, time.Now().Add(-1*time.Hour)) // expired
+
+	if count := store.CountActive(); count != 2 {
+		t.Errorf("CountActive() = %d, want 2 (expired should be cleaned)", count)
+	}
+}
+
+func TestCookieSecure(t *testing.T) {
+	tests := []struct {
+		name           string
+		forwardedProto string
+		tls            bool
+		expected       bool
+	}{
+		{"https forwarded", "https", false, true},
+		{"http forwarded", "http", false, false},
+		{"empty forwarded, no TLS", "", false, false},
+		{"empty forwarded, TLS", "", true, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest("GET", "/", nil)
+			if tt.forwardedProto != "" {
+				req.Header.Set("X-Forwarded-Proto", tt.forwardedProto)
+			}
+			if tt.tls {
+				req.TLS = &tls.ConnectionState{}
+			}
+			if got := CookieSecure(req); got != tt.expected {
+				t.Errorf("CookieSecure() = %v, want %v", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestSetCookie(t *testing.T) {
+	req := httptest.NewRequest("GET", "/", nil)
+	req.Header.Set("X-Forwarded-Proto", "https")
+	w := httptest.NewRecorder()
+
+	expiresAt := time.Now().Add(1 * time.Hour)
+	SetCookie(w, req, "test_cookie", "abc123", expiresAt)
+
+	cookies := w.Result().Cookies()
+	if len(cookies) != 1 {
+		t.Fatalf("expected 1 cookie, got %d", len(cookies))
+	}
+	c := cookies[0]
+	if c.Name != "test_cookie" {
+		t.Errorf("cookie name = %q, want test_cookie", c.Name)
+	}
+	if c.Value != "abc123" {
+		t.Errorf("cookie value = %q, want abc123", c.Value)
+	}
+	if !c.HttpOnly {
+		t.Error("cookie HttpOnly = false, want true")
+	}
+	if c.SameSite != http.SameSiteStrictMode {
+		t.Errorf("cookie SameSite = %v, want Strict", c.SameSite)
+	}
+	if !c.Secure {
+		t.Error("cookie Secure = false, want true (X-Forwarded-Proto: https)")
+	}
+	if c.Path != "/" {
+		t.Errorf("cookie Path = %q, want /", c.Path)
+	}
+}
+
+func TestClearCookie(t *testing.T) {
+	req := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+
+	ClearCookie(w, req, "test_cookie")
+
+	cookies := w.Result().Cookies()
+	if len(cookies) != 1 {
+		t.Fatalf("expected 1 cookie, got %d", len(cookies))
+	}
+	c := cookies[0]
+	if c.Name != "test_cookie" {
+		t.Errorf("cookie name = %q, want test_cookie", c.Name)
+	}
+	if c.Value != "" {
+		t.Errorf("cookie value = %q, want empty", c.Value)
+	}
+	if c.MaxAge != -1 {
+		t.Errorf("cookie MaxAge = %d, want -1", c.MaxAge)
+	}
+}
+
+func TestGetTokenFromCookie(t *testing.T) {
+	req := httptest.NewRequest("GET", "/", nil)
+	req.AddCookie(&http.Cookie{Name: "session", Value: "token123"})
+
+	token, ok := GetTokenFromCookie(req, "session")
+	if !ok {
+		t.Error("GetTokenFromCookie() ok = false, want true")
+	}
+	if token != "token123" {
+		t.Errorf("GetTokenFromCookie() = %q, want token123", token)
+	}
+
+	// Missing cookie
+	_, ok = GetTokenFromCookie(req, "nonexistent")
+	if ok {
+		t.Error("GetTokenFromCookie() for missing cookie ok = true, want false")
+	}
+
+	// Empty value
+	req2 := httptest.NewRequest("GET", "/", nil)
+	req2.AddCookie(&http.Cookie{Name: "session", Value: ""})
+	_, ok = GetTokenFromCookie(req2, "session")
+	if ok {
+		t.Error("GetTokenFromCookie() for empty value ok = true, want false")
+	}
+}
+
+func TestRequireAdmin(t *testing.T) {
+	store := NewSessionStore()
+	token, _ := GenerateToken()
+	store.Add(token, time.Now().Add(1*time.Hour))
+
+	handler := RequireAdmin(store, "session")(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("ok"))
+	})
+
+	// Valid session
+	req := httptest.NewRequest("GET", "/", nil)
+	req.AddCookie(&http.Cookie{Name: "session", Value: token})
+	w := httptest.NewRecorder()
+	handler(w, req)
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	// No cookie
+	req2 := httptest.NewRequest("GET", "/", nil)
+	w2 := httptest.NewRecorder()
+	handler(w2, req2)
+	if w2.Code != http.StatusUnauthorized {
+		t.Errorf("status = %d, want 401", w2.Code)
+	}
+
+	// Invalid token
+	req3 := httptest.NewRequest("GET", "/", nil)
+	req3.AddCookie(&http.Cookie{Name: "session", Value: "invalid"})
+	w3 := httptest.NewRecorder()
+	handler(w3, req3)
+	if w3.Code != http.StatusUnauthorized {
+		t.Errorf("status = %d, want 401", w3.Code)
+	}
+}

backend/chat/src/config/config.go

@@ -0,0 +1,118 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Defaults and constants
+const (
+	AdminSessionCookieName = "linearvoid_admin_session"
+	MaxAdminUploadBytes    int64 = 2 * 1024 * 1024 * 1024
+	DefaultAdminChunkSize  int64 = 8 * 1024 * 1024
+	MaxAdminChunkSize      int64 = 32 * 1024 * 1024
+	DefaultRateLimitMax          = 10
+	DefaultRateLimitWindow       = 10 * time.Second
+	DefaultAdminSessionTTL       = 12 * time.Hour
+	DefaultChatPort              = "3000"
+)
+
+// PlaylistPath returns the playlist file path from env or default.
+func PlaylistPath() string {
+	p := strings.TrimSpace(os.Getenv("PLAYLIST_PATH"))
+	if p == "" {
+		return "/app/playlist/playlist.txt"
+	}
+	return p
+}
+
+// MediaDir returns the media directory from env or default.
+func MediaDir() string {
+	d := strings.TrimSpace(os.Getenv("MEDIA_DIR"))
+	if d == "" {
+		return "/app/media"
+	}
+	return d
+}
+
+// AdminUsername returns the admin username from env or default.
+func AdminUsername() string {
+	u := strings.TrimSpace(os.Getenv("ADMIN_USERNAME"))
+	if u == "" {
+		return "admin"
+	}
+	return u
+}
+
+// AdminPassword returns the admin password from env or default.
+func AdminPassword() string {
+	p := strings.TrimSpace(os.Getenv("ADMIN_PASSWORD"))
+	if p == "" {
+		return "admin"
+	}
+	return p
+}
+
+// AdminSessionTTL returns the admin session TTL from env or default.
+func AdminSessionTTL() time.Duration {
+	raw := strings.TrimSpace(os.Getenv("ADMIN_SESSION_TTL_HOURS"))
+	if raw == "" {
+		return DefaultAdminSessionTTL
+	}
+	hours, err := strconv.Atoi(raw)
+	if err != nil || hours <= 0 {
+		return DefaultAdminSessionTTL
+	}
+	return time.Duration(hours) * time.Hour
+}
+
+// RateLimitMax returns the chat rate limit max messages per window.
+func RateLimitMax() int {
+	raw := strings.TrimSpace(os.Getenv("CHAT_RATE_LIMIT_MAX"))
+	if raw == "" {
+		return DefaultRateLimitMax
+	}
+	v, err := strconv.Atoi(raw)
+	if err != nil || v <= 0 {
+		return DefaultRateLimitMax
+	}
+	return v
+}
+
+// RateLimitWindow returns the chat rate limit window duration.
+func RateLimitWindow() time.Duration {
+	raw := strings.TrimSpace(os.Getenv("CHAT_RATE_LIMIT_WINDOW_S"))
+	if raw == "" {
+		return DefaultRateLimitWindow
+	}
+	v, err := strconv.Atoi(raw)
+	if err != nil || v <= 0 {
+		return DefaultRateLimitWindow
+	}
+	return time.Duration(v) * time.Second
+}
+
+// ChatPort returns the chat service port from env or default.
+func ChatPort() string {
+	p := strings.TrimSpace(os.Getenv("CHAT_PORT"))
+	if p == "" {
+		return DefaultChatPort
+	}
+	return p
+}
+
+// RedisAddress returns the Redis address from env or default.
+func RedisAddress() string {
+	a := strings.TrimSpace(os.Getenv("REDIS_URL"))
+	if a == "" {
+		return "redis:6379"
+	}
+	return a
+}
+
+// DatabaseURL returns the database URL from env (empty = SQLite default).
+func DatabaseURL() string {
+	return strings.TrimSpace(os.Getenv("DATABASE_URL"))
+}

backend/chat/src/config/config_test.go

@@ -0,0 +1,267 @@
+package config
+
+import (
+	"os"
+	"testing"
+	"time"
+)
+
+func TestPlaylistPath(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "/app/playlist/playlist.txt"},
+		{"custom", "/custom/playlist.txt", "/custom/playlist.txt"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("PLAYLIST_PATH", tt.env)
+				defer os.Unsetenv("PLAYLIST_PATH")
+			} else {
+				os.Unsetenv("PLAYLIST_PATH")
+			}
+			if got := PlaylistPath(); got != tt.expected {
+				t.Errorf("PlaylistPath() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestMediaDir(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "/app/media"},
+		{"custom", "/data/media", "/data/media"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("MEDIA_DIR", tt.env)
+				defer os.Unsetenv("MEDIA_DIR")
+			} else {
+				os.Unsetenv("MEDIA_DIR")
+			}
+			if got := MediaDir(); got != tt.expected {
+				t.Errorf("MediaDir() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestAdminUsername(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "admin"},
+		{"custom", "superadmin", "superadmin"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("ADMIN_USERNAME", tt.env)
+				defer os.Unsetenv("ADMIN_USERNAME")
+			} else {
+				os.Unsetenv("ADMIN_USERNAME")
+			}
+			if got := AdminUsername(); got != tt.expected {
+				t.Errorf("AdminUsername() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestAdminPassword(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "admin"},
+		{"custom", "secret123", "secret123"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("ADMIN_PASSWORD", tt.env)
+				defer os.Unsetenv("ADMIN_PASSWORD")
+			} else {
+				os.Unsetenv("ADMIN_PASSWORD")
+			}
+			if got := AdminPassword(); got != tt.expected {
+				t.Errorf("AdminPassword() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestAdminSessionTTL(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected time.Duration
+	}{
+		{"default", "", 12 * time.Hour},
+		{"custom", "24", 24 * time.Hour},
+		{"zero", "0", 12 * time.Hour},
+		{"negative", "-5", 12 * time.Hour},
+		{"invalid", "abc", 12 * time.Hour},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("ADMIN_SESSION_TTL_HOURS", tt.env)
+				defer os.Unsetenv("ADMIN_SESSION_TTL_HOURS")
+			} else {
+				os.Unsetenv("ADMIN_SESSION_TTL_HOURS")
+			}
+			if got := AdminSessionTTL(); got != tt.expected {
+				t.Errorf("AdminSessionTTL() = %v, want %v", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestRateLimitMax(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected int
+	}{
+		{"default", "", 10},
+		{"custom", "20", 20},
+		{"zero", "0", 10},
+		{"negative", "-5", 10},
+		{"invalid", "abc", 10},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("CHAT_RATE_LIMIT_MAX", tt.env)
+				defer os.Unsetenv("CHAT_RATE_LIMIT_MAX")
+			} else {
+				os.Unsetenv("CHAT_RATE_LIMIT_MAX")
+			}
+			if got := RateLimitMax(); got != tt.expected {
+				t.Errorf("RateLimitMax() = %d, want %d", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestRateLimitWindow(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected time.Duration
+	}{
+		{"default", "", 10 * time.Second},
+		{"custom", "30", 30 * time.Second},
+		{"zero", "0", 10 * time.Second},
+		{"negative", "-5", 10 * time.Second},
+		{"invalid", "abc", 10 * time.Second},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("CHAT_RATE_LIMIT_WINDOW_S", tt.env)
+				defer os.Unsetenv("CHAT_RATE_LIMIT_WINDOW_S")
+			} else {
+				os.Unsetenv("CHAT_RATE_LIMIT_WINDOW_S")
+			}
+			if got := RateLimitWindow(); got != tt.expected {
+				t.Errorf("RateLimitWindow() = %v, want %v", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestChatPort(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "3000"},
+		{"custom", "8080", "8080"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("CHAT_PORT", tt.env)
+				defer os.Unsetenv("CHAT_PORT")
+			} else {
+				os.Unsetenv("CHAT_PORT")
+			}
+			if got := ChatPort(); got != tt.expected {
+				t.Errorf("ChatPort() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestRedisAddress(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", "redis:6379"},
+		{"custom", "redis.example.com:6380", "redis.example.com:6380"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("REDIS_URL", tt.env)
+				defer os.Unsetenv("REDIS_URL")
+			} else {
+				os.Unsetenv("REDIS_URL")
+			}
+			if got := RedisAddress(); got != tt.expected {
+				t.Errorf("RedisAddress() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestDatabaseURL(t *testing.T) {
+	tests := []struct {
+		name     string
+		env      string
+		expected string
+	}{
+		{"default", "", ""},
+		{"sqlite", "sqlite://test.db", "sqlite://test.db"},
+		{"postgres", "postgres://user:pass@localhost/db", "postgres://user:pass@localhost/db"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env != "" {
+				os.Setenv("DATABASE_URL", tt.env)
+				defer os.Unsetenv("DATABASE_URL")
+			} else {
+				os.Unsetenv("DATABASE_URL")
+			}
+			if got := DatabaseURL(); got != tt.expected {
+				t.Errorf("DatabaseURL() = %q, want %q", got, tt.expected)
+			}
+		})
+	}
+}

backend/chat/src/db/db.go

@@ -0,0 +1,82 @@
+package db
+
+import (
+	"context"
+	"log"
+	"strings"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+// DBClient wraps gorm.DB for testability.
+type DBClient struct {
+	*gorm.DB
+}
+
+// InitDB initializes configured SQL storage for chat, moderation, and admin metadata (ADR-006).
+// Returns the client and the driver name.
+func InitDB(databaseURL string) (*DBClient, string, error) {
+	var (
+		gormDB *gorm.DB
+		err    error
+		driver = "sqlite"
+	)
+
+	switch {
+	case databaseURL == "":
+		gormDB, err = gorm.Open(sqlite.Open("chat.db"), &gorm.Config{})
+	case strings.HasPrefix(databaseURL, "sqlite://"):
+		sqlitePath := strings.TrimPrefix(databaseURL, "sqlite://")
+		if sqlitePath == "" {
+			sqlitePath = "chat.db"
+		}
+		gormDB, err = gorm.Open(sqlite.Open(sqlitePath), &gorm.Config{})
+	case strings.HasPrefix(databaseURL, "postgres://") || strings.HasPrefix(databaseURL, "postgresql://"):
+		driver = "postgres"
+		gormDB, err = gorm.Open(postgres.Open(databaseURL), &gorm.Config{})
+	default:
+		log.Fatalf("Unsupported DATABASE_URL scheme: %s", databaseURL)
+	}
+
+	if err != nil {
+		return nil, driver, err
+	}
+
+	gormDB.AutoMigrate(&Message{}, &ModerationLog{}, &Media{}, &ScheduleOverride{})
+	log.Printf("%s database initialized (chat history, moderation log, media metadata)", strings.Title(driver))
+
+	return &DBClient{DB: gormDB}, driver, nil
+}
+
+// RedisClient wraps the Redis client for testability.
+// Interface defined for mocking in tests.
+type RedisClient interface {
+	Ping(ctx context.Context) error
+	Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error
+	Get(ctx context.Context, key string) (string, error)
+	Del(ctx context.Context, keys ...string) error
+	Incr(ctx context.Context, key string) (int64, error)
+	Decr(ctx context.Context, key string) (int64, error)
+	Expire(ctx context.Context, key string, expiration time.Duration) error
+	Exists(ctx context.Context, keys ...string) (int64, error)
+	Publish(ctx context.Context, channel string, message interface{}) error
+	PSubscribe(ctx context.Context, channels ...string) PubSub
+	Scan(ctx context.Context, cursor uint64, match string, count int64) ([]string, uint64, error)
+	Info(ctx context.Context, sections ...string) (string, error)
+	Close() error
+}
+
+// PubSub wraps Redis pub/sub subscription.
+type PubSub interface {
+	ReceiveMessage(ctx context.Context) (*PubSubMessage, error)
+	Close() error
+}
+
+// PubSubMessage represents a received pub/sub message.
+type PubSubMessage struct {
+	Channel string
+	Payload string
+}

backend/chat/src/db/db_test.go

@@ -0,0 +1,179 @@
+package db
+
+import (
+	"testing"
+	"time"
+)
+
+func TestInitDB_SQLite(t *testing.T) {
+	client, driver, err := InitDB("sqlite://:memory:")
+	if err != nil {
+		t.Fatalf("InitDB() error = %v", err)
+	}
+	if driver != "sqlite" {
+		t.Errorf("InitDB() driver = %q, want sqlite", driver)
+	}
+	if client == nil {
+		t.Fatal("InitDB() client = nil")
+	}
+
+	// Verify tables exist by running AutoMigrate (idempotent)
+	err = client.DB.AutoMigrate(&Message{}, &ModerationLog{}, &Media{}, &ScheduleOverride{})
+	if err != nil {
+		t.Errorf("AutoMigrate error = %v", err)
+	}
+
+	// Verify CRUD on Message
+	msg := Message{
+		Room:      "test",
+		Username:  "user1",
+		Text:      "hello",
+		Timestamp: time.Now(),
+		Type:      "public",
+	}
+	if err := client.DB.Create(&msg).Error; err != nil {
+		t.Fatalf("Create message error = %v", err)
+	}
+	if msg.ID == 0 {
+		t.Error("Create message did not set ID")
+	}
+
+	var count int64
+	client.DB.Model(&Message{}).Count(&count)
+	if count != 1 {
+		t.Errorf("Message count = %d, want 1", count)
+	}
+
+	// Verify read
+	var read Message
+	if err := client.DB.First(&read, msg.ID).Error; err != nil {
+		t.Fatalf("First message error = %v", err)
+	}
+	if read.Text != "hello" {
+		t.Errorf("read.Text = %q, want hello", read.Text)
+	}
+
+	// Verify delete
+	client.DB.Delete(&Message{}, msg.ID)
+	client.DB.Model(&Message{}).Count(&count)
+	if count != 0 {
+		t.Errorf("Message count after delete = %d, want 0", count)
+	}
+}
+
+func TestInitDB_ModerationLog(t *testing.T) {
+	client, _, err := InitDB("sqlite://:memory:")
+	if err != nil {
+		t.Fatalf("InitDB() error = %v", err)
+	}
+
+	log := ModerationLog{
+		Action:    "mute",
+		Target:    "user1",
+		Moderator: "admin",
+		Reason:    "spam",
+		Timestamp: time.Now(),
+	}
+	if err := client.DB.Create(&log).Error; err != nil {
+		t.Fatalf("Create moderation log error = %v", err)
+	}
+	if log.ID == 0 {
+		t.Error("Create moderation log did not set ID")
+	}
+
+	var count int64
+	client.DB.Model(&ModerationLog{}).Count(&count)
+	if count != 1 {
+		t.Errorf("ModerationLog count = %d, want 1", count)
+	}
+}
+
+func TestInitDB_Media(t *testing.T) {
+	client, _, err := InitDB("sqlite://:memory:")
+	if err != nil {
+		t.Fatalf("InitDB() error = %v", err)
+	}
+
+	media := Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            "/media/test.mp4",
+		SizeBytes:       1024,
+		DurationSeconds: 60,
+		Status:          "ready",
+		Title:           "Test Video",
+		Tags:            "tag1,tag2",
+	}
+	if err := client.DB.Create(&media).Error; err != nil {
+		t.Fatalf("Create media error = %v", err)
+	}
+	if media.ID == 0 {
+		t.Error("Create media did not set ID")
+	}
+
+	// Verify update
+	client.DB.Model(&media).Update("status", "needs_normalization")
+	var updated Media
+	client.DB.First(&updated, media.ID)
+	if updated.Status != "needs_normalization" {
+		t.Errorf("updated.Status = %q, want needs_normalization", updated.Status)
+	}
+}
+
+func TestInitDB_ScheduleOverride(t *testing.T) {
+	client, _, err := InitDB("sqlite://:memory:")
+	if err != nil {
+		t.Fatalf("InitDB() error = %v", err)
+	}
+
+	now := time.Now()
+	ov := ScheduleOverride{
+		MediaID:   1,
+		StartTime: now,
+		EndTime:   now.Add(1 * time.Hour),
+		Reason:    "special event",
+	}
+	if err := client.DB.Create(&ov).Error; err != nil {
+		t.Fatalf("Create schedule override error = %v", err)
+	}
+	if ov.ID == 0 {
+		t.Error("Create schedule override did not set ID")
+	}
+
+	// Conflict detection
+	var conflict int64
+	client.DB.Model(&ScheduleOverride{}).
+		Where("start_time < ? AND end_time > ?", ov.EndTime, ov.StartTime).
+		Count(&conflict)
+	if conflict != 1 {
+		t.Errorf("conflict count = %d, want 1", conflict)
+	}
+}
+
+func TestInitDB_EmptyURL(t *testing.T) {
+	// Empty URL should default to SQLite chat.db
+	// This creates a file, clean up after
+	client, driver, err := InitDB("")
+	if err != nil {
+		t.Fatalf("InitDB(\"\") error = %v", err)
+	}
+	if driver != "sqlite" {
+		t.Errorf("InitDB(\"\") driver = %q, want sqlite", driver)
+	}
+	if client == nil {
+		t.Fatal("InitDB(\"\") client = nil")
+	}
+}
+
+func TestInitDB_SQLitePath(t *testing.T) {
+	client, driver, err := InitDB("sqlite://:memory:?cache=shared")
+	if err != nil {
+		t.Fatalf("InitDB() error = %v", err)
+	}
+	if driver != "sqlite" {
+		t.Errorf("InitDB() driver = %q, want sqlite", driver)
+	}
+	if client == nil {
+		t.Fatal("InitDB() client = nil")
+	}
+}

backend/chat/src/db/models.go

@@ -0,0 +1,57 @@
+package db
+
+import (
+	"time"
+)
+
+// Message represents a chat message (persisted in SQL DB per ADR-006)
+type Message struct {
+	ID        uint      `gorm:"primarykey" json:"id"`
+	Room      string    `json:"room"`
+	Username  string    `json:"username"`
+	Text      string    `json:"text"`
+	Timestamp time.Time `json:"timestamp"`
+	Type      string    `json:"type"` // "public", "private", "system", "moderation"
+}
+
+// ModerationLog for audit trail (immutable per ADR-005)
+type ModerationLog struct {
+	ID        uint      `gorm:"primarykey" json:"id"`
+	Action    string    `json:"action"` // "mute", "ban", "delete", "timeout"
+	Target    string    `json:"target"`
+	Moderator string    `json:"moderator"`
+	Reason    string    `json:"reason"`
+	Timestamp time.Time `json:"timestamp"`
+}
+
+// Media stores admin media library metadata (filesystem + DB model per ADR-006)
+type Media struct {
+	ID              uint      `gorm:"primarykey" json:"id"`
+	Filename        string    `gorm:"index" json:"filename"`
+	OriginalName    string    `json:"originalName"`
+	Path            string    `json:"path"`
+	SizeBytes       int64     `json:"sizeBytes"`
+	DurationSeconds int       `json:"durationSeconds"`
+	Status          string    `gorm:"index" json:"status"`
+	Title           string    `json:"title"`
+	Tags            string    `json:"tags"`
+	UploadedAt      time.Time `gorm:"autoCreateTime" json:"uploadedAt"`
+	UpdatedAt       time.Time `gorm:"autoUpdateTime" json:"updatedAt"`
+}
+
+// ScheduleOverride represents a scheduled playlist override (ADR-004)
+type ScheduleOverride struct {
+	ID        uint      `gorm:"primarykey" json:"id"`
+	MediaID   uint      `json:"mediaId"`
+	StartTime time.Time `json:"startTime"`
+	EndTime   time.Time `json:"endTime"`
+	Reason    string    `json:"reason"`
+	CreatedAt time.Time `json:"createdAt"`
+}
+
+// Presence tracks online users per room (using Redis per ADR-007)
+type Presence struct {
+	Username string `json:"username"`
+	Room     string `json:"room"`
+	Online   bool   `json:"online"`
+}

backend/chat/src/db/redis.go

@@ -0,0 +1,163 @@
+package db
+
+import (
+	"context"
+	"log"
+	"strings"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// RedisWrapper wraps go-redis client to implement RedisClient interface.
+type RedisWrapper struct {
+	client *redis.Client
+}
+
+// NewRedisWrapper creates a RedisWrapper from a go-redis client.
+func NewRedisWrapper(client *redis.Client) *RedisWrapper {
+	return &RedisWrapper{client: client}
+}
+
+// InitRedis initializes Redis for presence, rate limiting, and pub/sub (ADR-007).
+// Returns nil if Redis is unavailable (non-fatal).
+func InitRedis(redisAddress string) *RedisWrapper {
+	var options *redis.Options
+	var err error
+
+	if strings.Contains(redisAddress, "://") {
+		options, err = redis.ParseURL(redisAddress)
+		if err != nil {
+			log.Printf("Redis configuration warning: %v (rate limiting and presence will be disabled)", err)
+			return nil
+		}
+	} else {
+		options = &redis.Options{Addr: redisAddress}
+	}
+
+	client := redis.NewClient(options)
+	if err := client.Ping(context.Background()).Err(); err != nil {
+		log.Printf("Redis connection warning: %v (rate limiting and presence will be disabled)", err)
+		client.Close()
+		// Start auto-reconnect goroutine
+		go redisReconnectLoop(redisAddress, options)
+		return nil
+	}
+
+	log.Println("Redis connected successfully (presence, rate limiting, pub/sub enabled)")
+	return &RedisWrapper{client: client}
+}
+
+// redisReconnectLoop attempts to reconnect to Redis with exponential backoff.
+func redisReconnectLoop(addr string, baseOptions *redis.Options) {
+	backoff := 2 * time.Second
+	maxBackoff := 60 * time.Second
+	for {
+		time.Sleep(backoff)
+		testClient := redis.NewClient(baseOptions)
+		if err := testClient.Ping(context.Background()).Err(); err != nil {
+			log.Printf("Redis reconnect failed: %v (retry in %v)", err, backoff)
+			backoff *= 2
+			if backoff > maxBackoff {
+				backoff = maxBackoff
+			}
+			testClient.Close()
+			continue
+		}
+		// Reconnected — caller must replace their reference.
+		// This is a best-effort background reconnect; the wrapper
+		// returned by InitRedis remains nil until a new InitRedis call.
+		log.Println("Redis reconnected successfully (background)")
+		testClient.Close()
+		return
+	}
+}
+
+// Ping checks Redis connectivity.
+func (r *RedisWrapper) Ping(ctx context.Context) error {
+	if r == nil || r.client == nil {
+		return redis.ErrClosed
+	}
+	return r.client.Ping(ctx).Err()
+}
+
+// Set stores a key with TTL.
+func (r *RedisWrapper) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
+	return r.client.Set(ctx, key, value, expiration).Err()
+}
+
+// Get retrieves a key.
+func (r *RedisWrapper) Get(ctx context.Context, key string) (string, error) {
+	return r.client.Get(ctx, key).Result()
+}
+
+// Del removes keys.
+func (r *RedisWrapper) Del(ctx context.Context, keys ...string) error {
+	return r.client.Del(ctx, keys...).Err()
+}
+
+// Incr increments a key.
+func (r *RedisWrapper) Incr(ctx context.Context, key string) (int64, error) {
+	return r.client.Incr(ctx, key).Result()
+}
+
+// Decr decrements a key.
+func (r *RedisWrapper) Decr(ctx context.Context, key string) (int64, error) {
+	return r.client.Decr(ctx, key).Result()
+}
+
+// Expire sets TTL on a key.
+func (r *RedisWrapper) Expire(ctx context.Context, key string, expiration time.Duration) error {
+	return r.client.Expire(ctx, key, expiration).Err()
+}
+
+// Exists checks if keys exist.
+func (r *RedisWrapper) Exists(ctx context.Context, keys ...string) (int64, error) {
+	return r.client.Exists(ctx, keys...).Result()
+}
+
+// Publish publishes a message to a channel.
+func (r *RedisWrapper) Publish(ctx context.Context, channel string, message interface{}) error {
+	return r.client.Publish(ctx, channel, message).Err()
+}
+
+// PSubscribe subscribes to channels by pattern.
+func (r *RedisWrapper) PSubscribe(ctx context.Context, channels ...string) PubSub {
+	ps := r.client.PSubscribe(ctx, channels...)
+	return &redisPubSubWrapper{ps: ps}
+}
+
+// Scan scans keys matching a pattern.
+func (r *RedisWrapper) Scan(ctx context.Context, cursor uint64, match string, count int64) ([]string, uint64, error) {
+	return r.client.Scan(ctx, cursor, match, count).Result()
+}
+
+// Info returns Redis server info.
+func (r *RedisWrapper) Info(ctx context.Context, sections ...string) (string, error) {
+	return r.client.Info(ctx, sections...).Result()
+}
+
+// Close closes the Redis connection.
+func (r *RedisWrapper) Close() error {
+	if r == nil || r.client == nil {
+		return nil
+	}
+	return r.client.Close()
+}
+
+// redisPubSubWrapper wraps go-redis PubSub.
+type redisPubSubWrapper struct {
+	ps *redis.PubSub
+}
+
+func (w *redisPubSubWrapper) ReceiveMessage(ctx context.Context) (*PubSubMessage, error) {
+	msg, err := w.ps.ReceiveMessage(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &PubSubMessage{Channel: msg.Channel, Payload: msg.Payload}, nil
+}
+
+func (w *redisPubSubWrapper) Close() error {
+	return w.ps.Close()
+}

backend/chat/src/handlers/handlers_test.go

@@ -0,0 +1,947 @@
+package handlers
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+
+	"chat/src/auth"
+	"chat/src/config"
+	"chat/src/db"
+	"chat/src/ws"
+)
+
+// mockRedis implements db.RedisClient for handler tests.
+type mockRedis struct {
+	mu    sync.Mutex
+	store map[string]string
+}
+
+func newMockRedis() *mockRedis {
+	return &mockRedis{store: make(map[string]string)}
+}
+
+func (m *mockRedis) Ping(ctx context.Context) error { return nil }
+func (m *mockRedis) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.store[key] = value.(string)
+	return nil
+}
+func (m *mockRedis) Get(ctx context.Context, key string) (string, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.store[key], nil
+}
+func (m *mockRedis) Del(ctx context.Context, keys ...string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, k := range keys {
+		delete(m.store, k)
+	}
+	return nil
+}
+func (m *mockRedis) Incr(ctx context.Context, key string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.store[key] = "1"
+	return 1, nil
+}
+func (m *mockRedis) Decr(ctx context.Context, key string) (int64, error) { return 0, nil }
+func (m *mockRedis) Expire(ctx context.Context, key string, expiration time.Duration) error {
+	return nil
+}
+func (m *mockRedis) Exists(ctx context.Context, keys ...string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, k := range keys {
+		if _, ok := m.store[k]; ok {
+			return 1, nil
+		}
+	}
+	return 0, nil
+}
+func (m *mockRedis) Publish(ctx context.Context, channel string, message interface{}) error {
+	return nil
+}
+func (m *mockRedis) PSubscribe(ctx context.Context, channels ...string) db.PubSub {
+	return nil
+}
+func (m *mockRedis) Scan(ctx context.Context, cursor uint64, match string, count int64) ([]string, uint64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var keys []string
+	for k := range m.store {
+		if strings.Contains(k, strings.TrimSuffix(match, "*")) {
+			keys = append(keys, k)
+		}
+	}
+	return keys, 0, nil
+}
+func (m *mockRedis) Info(ctx context.Context, sections ...string) (string, error) {
+	return "connected_clients:1\nused_memory_human:1M\n", nil
+}
+func (m *mockRedis) Close() error { return nil }
+
+func setupTestDeps(t *testing.T) (*Dependencies, *gorm.DB, *auth.SessionStore) {
+	t.Helper()
+	gormDB, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("failed to open test DB: %v", err)
+	}
+	gormDB.AutoMigrate(&db.Message{}, &db.ModerationLog{}, &db.Media{}, &db.ScheduleOverride{})
+	mr := newMockRedis()
+	sessionStore := auth.NewSessionStore()
+	hub := ws.NewHub(gormDB, mr, "test-instance", 10, 10*time.Second, config.AdminUsername())
+
+	deps := &Dependencies{
+		DB:           gormDB,
+		Redis:        mr,
+		Hub:          hub,
+		SessionStore: sessionStore,
+		DBDriver:     "sqlite",
+	}
+	return deps, gormDB, sessionStore
+}
+
+// adminCookie creates a valid admin session and returns the cookie header.
+func adminCookie(t *testing.T, store *auth.SessionStore) string {
+	t.Helper()
+	token, _ := auth.GenerateToken()
+	store.Add(token, time.Now().Add(1*time.Hour))
+	return config.AdminSessionCookieName + "=" + token
+}
+
+func TestHandleAdminLogin_Success(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+	handler := HandleAdminLogin(deps)
+
+	// Ensure env vars are set for credential check
+	os.Setenv("ADMIN_USERNAME", "admin")
+	os.Setenv("ADMIN_PASSWORD", "admin")
+	defer os.Unsetenv("ADMIN_USERNAME")
+	defer os.Unsetenv("ADMIN_PASSWORD")
+
+	body := `{"username":"admin","password":"admin"}`
+	req := httptest.NewRequest("POST", "/api/admin/login", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp AdminSessionResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if !resp.Authenticated {
+		t.Error("Authenticated = false, want true")
+	}
+
+	// Check cookie set
+	cookies := w.Result().Cookies()
+	found := false
+	for _, c := range cookies {
+		if c.Name == config.AdminSessionCookieName {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("session cookie not set")
+	}
+}
+
+func TestHandleAdminLogin_InvalidCreds(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+	handler := HandleAdminLogin(deps)
+
+	body := `{"username":"admin","password":"wrong"}`
+	req := httptest.NewRequest("POST", "/api/admin/login", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Errorf("status = %d, want 401", w.Code)
+	}
+}
+
+func TestHandleAdminLogin_InvalidJSON(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+	handler := HandleAdminLogin(deps)
+
+	req := httptest.NewRequest("POST", "/api/admin/login", strings.NewReader("not json"))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status = %d, want 400", w.Code)
+	}
+}
+
+func TestHandleAdminLogin_WrongMethod(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+	handler := HandleAdminLogin(deps)
+
+	req := httptest.NewRequest("GET", "/api/admin/login", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusMethodNotAllowed {
+		t.Errorf("status = %d, want 405", w.Code)
+	}
+}
+
+func TestHandleAdminLogout(t *testing.T) {
+	deps, _, store := setupTestDeps(t)
+	handler := HandleAdminLogout(deps)
+
+	cookie := adminCookie(t, store)
+	req := httptest.NewRequest("POST", "/api/admin/logout", nil)
+	req.Header.Set("Cookie", cookie)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	// Cookie should be cleared
+	cookies := w.Result().Cookies()
+	found := false
+	for _, c := range cookies {
+		if c.Name == config.AdminSessionCookieName && c.MaxAge == -1 {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("session cookie not cleared")
+	}
+}
+
+func TestHandleAdminSession_Authenticated(t *testing.T) {
+	deps, _, store := setupTestDeps(t)
+	handler := HandleAdminSession(deps)
+
+	cookie := adminCookie(t, store)
+	req := httptest.NewRequest("GET", "/api/admin/session", nil)
+	req.Header.Set("Cookie", cookie)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp AdminSessionResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if !resp.Authenticated {
+		t.Error("Authenticated = false, want true")
+	}
+}
+
+func TestHandleAdminSession_Unauthenticated(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+	handler := HandleAdminSession(deps)
+
+	req := httptest.NewRequest("GET", "/api/admin/session", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Errorf("status = %d, want 401", w.Code)
+	}
+}
+
+func TestHandleAdminOverview(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	// Add some test data
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hi", Timestamp: time.Now(), Type: "public"})
+	gormDB.Create(&db.ModerationLog{Action: "mute", Target: "u2", Moderator: "admin", Reason: "spam", Timestamp: time.Now()})
+
+	handler := HandleAdminOverview(deps)
+	req := httptest.NewRequest("GET", "/api/admin/overview", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var overview AdminOverview
+	json.NewDecoder(w.Body).Decode(&overview)
+	if overview.StoredMessages != 1 {
+		t.Errorf("StoredMessages = %d, want 1", overview.StoredMessages)
+	}
+	if overview.ModerationActions != 1 {
+		t.Errorf("ModerationActions = %d, want 1", overview.ModerationActions)
+	}
+}
+
+func TestHandleAdminPlaylist_Get(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	// Create temp playlist
+	tmpDir := t.TempDir()
+	playlistPath := filepath.Join(tmpDir, "playlist.txt")
+	os.WriteFile(playlistPath, []byte("file /videos/test.mp4\n"), 0644)
+	os.Setenv("PLAYLIST_PATH", playlistPath)
+	defer os.Unsetenv("PLAYLIST_PATH")
+
+	handler := HandleAdminPlaylist(deps)
+	req := httptest.NewRequest("GET", "/api/admin/playlist", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var payload PlaylistPayload
+	json.NewDecoder(w.Body).Decode(&payload)
+	if !strings.Contains(payload.Content, "test.mp4") {
+		t.Errorf("Content = %q, want test.mp4", payload.Content)
+	}
+}
+
+func TestHandleAdminPlaylist_Put(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	tmpDir := t.TempDir()
+	playlistPath := filepath.Join(tmpDir, "playlist.txt")
+	os.Setenv("PLAYLIST_PATH", playlistPath)
+	defer os.Unsetenv("PLAYLIST_PATH")
+
+	handler := HandleAdminPlaylist(deps)
+	body := `{"content":"file /videos/new.mp4"}`
+	req := httptest.NewRequest("PUT", "/api/admin/playlist", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	// Verify file written
+	data, _ := os.ReadFile(playlistPath)
+	if !strings.Contains(string(data), "new.mp4") {
+		t.Errorf("file content = %q, want new.mp4", string(data))
+	}
+}
+
+func TestHandleAdminModerationLogs(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.ModerationLog{Action: "mute", Target: "u1", Moderator: "admin", Reason: "spam", Timestamp: time.Now()})
+
+	handler := HandleAdminModerationLogs(deps)
+	req := httptest.NewRequest("GET", "/api/admin/moderation/logs", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp ModerationLogsResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if len(resp.Logs) != 1 {
+		t.Errorf("len(Logs) = %d, want 1", len(resp.Logs))
+	}
+}
+
+func TestHandleAdminModerationAction(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	handler := HandleAdminModerationAction(deps)
+	body := `{"action":"mute","target":"baduser","moderator":"admin","reason":"spam","room":"main"}`
+	req := httptest.NewRequest("POST", "/api/admin/moderation/actions", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var count int64
+	gormDB.Model(&db.ModerationLog{}).Count(&count)
+	if count != 1 {
+		t.Errorf("moderation log count = %d, want 1", count)
+	}
+}
+
+func TestHandleAdminModerationAction_MissingFields(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminModerationAction(deps)
+	body := `{"action":"mute"}`
+	req := httptest.NewRequest("POST", "/api/admin/moderation/actions", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status = %d, want 400", w.Code)
+	}
+}
+
+func TestHandleAdminAnalytics(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hi", Timestamp: time.Now(), Type: "public"})
+	gormDB.Create(&db.Message{Room: "main", Username: "u2", Text: "hey", Timestamp: time.Now(), Type: "public"})
+
+	handler := HandleAdminAnalytics(deps)
+	req := httptest.NewRequest("GET", "/api/admin/analytics", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var analytics AdminAnalytics
+	json.NewDecoder(w.Body).Decode(&analytics)
+	if analytics.TotalMessages != 2 {
+		t.Errorf("TotalMessages = %d, want 2", analytics.TotalMessages)
+	}
+}
+
+func TestHandleAdminSystemSummary(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminSystemSummary(deps)
+	req := httptest.NewRequest("GET", "/api/admin/system", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var summary AdminSystemSummary
+	json.NewDecoder(w.Body).Decode(&summary)
+	if summary.DatabaseDriver != "sqlite" {
+		t.Errorf("DatabaseDriver = %q, want sqlite", summary.DatabaseDriver)
+	}
+}
+
+func TestHandleAdminConfig_Get(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminConfig(deps)
+	req := httptest.NewRequest("GET", "/api/admin/config", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminConfig_Put(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminConfig(deps)
+	body := `{"rateLimitMax":20}`
+	req := httptest.NewRequest("PUT", "/api/admin/config", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminRestart(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminRestart(deps)
+	req := httptest.NewRequest("POST", "/api/admin/restart?service=chat", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminUsers_Get(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminUsers(deps)
+	req := httptest.NewRequest("GET", "/api/admin/users", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminUsers_Post(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminUsers(deps)
+	body := `{"action":"mute","username":"baduser","duration":10}`
+	req := httptest.NewRequest("POST", "/api/admin/users", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminSchedule(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	tmpDir := t.TempDir()
+	playlistPath := filepath.Join(tmpDir, "playlist.txt")
+	os.WriteFile(playlistPath, []byte("file /videos/test.mp4\n"), 0644)
+	os.Setenv("PLAYLIST_PATH", playlistPath)
+	defer os.Unsetenv("PLAYLIST_PATH")
+
+	gormDB.Create(&db.Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            "/videos/test.mp4",
+		SizeBytes:       1024,
+		DurationSeconds: 60,
+		Status:          "ready",
+		Title:           "Test Video",
+	})
+
+	handler := HandleAdminSchedule(deps)
+	req := httptest.NewRequest("GET", "/api/admin/schedule", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp AdminScheduleResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if resp.MatchedEntries != 1 {
+		t.Errorf("MatchedEntries = %d, want 1", resp.MatchedEntries)
+	}
+}
+
+func TestHandleAdminScheduleOverrides_CRUD(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	// Create
+	handler := HandleAdminScheduleOverrides(deps)
+	now := time.Now()
+	body, _ := json.Marshal(db.ScheduleOverride{
+		MediaID:   1,
+		StartTime: now,
+		EndTime:   now.Add(1 * time.Hour),
+		Reason:    "test",
+	})
+	req := httptest.NewRequest("POST", "/api/admin/schedule/overrides", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	handler(w, req)
+
+	if w.Code != http.StatusCreated {
+		t.Errorf("POST status = %d, want 201", w.Code)
+	}
+
+	// List
+	req2 := httptest.NewRequest("GET", "/api/admin/schedule/overrides", nil)
+	w2 := httptest.NewRecorder()
+	handler(w2, req2)
+
+	if w2.Code != http.StatusOK {
+		t.Errorf("GET status = %d, want 200", w2.Code)
+	}
+
+	// Delete
+	var overrides []db.ScheduleOverride
+	gormDB.Find(&overrides)
+	if len(overrides) > 0 {
+		req3 := httptest.NewRequest("DELETE", "/api/admin/schedule/overrides?id=1", nil)
+		w3 := httptest.NewRecorder()
+		handler(w3, req3)
+		if w3.Code != http.StatusNoContent {
+			t.Errorf("DELETE status = %d, want 204", w3.Code)
+		}
+	}
+}
+
+func TestHandleAdminChatLog(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hello", Timestamp: time.Now(), Type: "public"})
+
+	handler := HandleAdminChatLog(deps)
+	req := httptest.NewRequest("GET", "/api/admin/chat-log", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp ChatLogListResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if resp.Total != 1 {
+		t.Errorf("Total = %d, want 1", resp.Total)
+	}
+}
+
+func TestHandleAdminChatLog_FilterByRoom(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hello", Timestamp: time.Now(), Type: "public"})
+	gormDB.Create(&db.Message{Room: "lobby", Username: "u2", Text: "hey", Timestamp: time.Now(), Type: "public"})
+
+	handler := HandleAdminChatLog(deps)
+	req := httptest.NewRequest("GET", "/api/admin/chat-log?room=main", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp ChatLogListResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if resp.Total != 1 {
+		t.Errorf("Total = %d, want 1", resp.Total)
+	}
+}
+
+func TestHandleAdminChatLogByID_Get(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	msg := db.Message{Room: "main", Username: "u1", Text: "hello", Timestamp: time.Now(), Type: "public"}
+	gormDB.Create(&msg)
+
+	handler := HandleAdminChatLogByID(deps)
+	req := httptest.NewRequest("GET", "/api/admin/chat-log/1", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminChatLogByID_Delete(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	msg := db.Message{Room: "main", Username: "u1", Text: "hello", Timestamp: time.Now(), Type: "public"}
+	gormDB.Create(&msg)
+
+	handler := HandleAdminChatLogByID(deps)
+	req := httptest.NewRequest("DELETE", "/api/admin/chat-log/1", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusNoContent {
+		t.Errorf("status = %d, want 204", w.Code)
+	}
+
+	var count int64
+	gormDB.Model(&db.Message{}).Count(&count)
+	if count != 0 {
+		t.Errorf("message count after delete = %d, want 0", count)
+	}
+}
+
+func TestHandleAdminChatLogBulk(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "m1", Timestamp: time.Now(), Type: "public"})
+	gormDB.Create(&db.Message{Room: "main", Username: "u2", Text: "m2", Timestamp: time.Now(), Type: "public"})
+
+	handler := HandleAdminChatLogBulk(deps)
+	body := `{"ids":[1,2]}`
+	req := httptest.NewRequest("DELETE", "/api/admin/chat-log/bulk", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var count int64
+	gormDB.Model(&db.Message{}).Count(&count)
+	if count != 0 {
+		t.Errorf("message count after bulk delete = %d, want 0", count)
+	}
+}
+
+func TestHandleAdminChatLogExport(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hello", Timestamp: time.Now(), Type: "public"})
+
+	handler := HandleAdminChatLogExport(deps)
+	req := httptest.NewRequest("GET", "/api/admin/chat-log/export", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	contentType := w.Header().Get("Content-Type")
+	if !strings.Contains(contentType, "text/csv") {
+		t.Errorf("Content-Type = %q, want text/csv", contentType)
+	}
+
+	body := w.Body.String()
+	if !strings.Contains(body, "hello") {
+		t.Errorf("CSV body missing 'hello': %s", body)
+	}
+}
+
+func TestHandlePublicSchedule(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	tmpDir := t.TempDir()
+	playlistPath := filepath.Join(tmpDir, "playlist.txt")
+	os.WriteFile(playlistPath, []byte("file /videos/test.mp4\n"), 0644)
+	os.Setenv("PLAYLIST_PATH", playlistPath)
+	defer os.Unsetenv("PLAYLIST_PATH")
+
+	handler := HandlePublicSchedule(deps)
+	req := httptest.NewRequest("GET", "/api/schedule", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminMedia_Get(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            "/media/test.mp4",
+		SizeBytes:       1024,
+		DurationSeconds: 60,
+		Status:          "ready",
+		Title:           "Test",
+	})
+
+	handler := HandleAdminMedia(deps)
+	req := httptest.NewRequest("GET", "/api/admin/media", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var resp AdminMediaResponse
+	json.NewDecoder(w.Body).Decode(&resp)
+	if len(resp.Files) != 1 {
+		t.Errorf("len(Files) = %d, want 1", len(resp.Files))
+	}
+}
+
+func TestHandleAdminMediaByID_Get(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            "/media/test.mp4",
+		SizeBytes:       1024,
+		DurationSeconds: 60,
+		Status:          "ready",
+		Title:           "Test",
+	})
+
+	handler := HandleAdminMediaByID(deps)
+	req := httptest.NewRequest("GET", "/api/admin/media/1", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+}
+
+func TestHandleAdminMediaByID_NotFound(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminMediaByID(deps)
+	req := httptest.NewRequest("GET", "/api/admin/media/999", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("status = %d, want 404", w.Code)
+	}
+}
+
+func TestHandleAdminMediaByID_Put(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	gormDB.Create(&db.Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            "/media/test.mp4",
+		SizeBytes:       1024,
+		DurationSeconds: 60,
+		Status:          "ready",
+		Title:           "Old Title",
+	})
+
+	handler := HandleAdminMediaByID(deps)
+	body := `{"title":"New Title","status":"needs_normalization","tags":"tag1"}`
+	req := httptest.NewRequest("PUT", "/api/admin/media/1", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var updated db.Media
+	gormDB.First(&updated, 1)
+	if updated.Title != "New Title" {
+		t.Errorf("Title = %q, want New Title", updated.Title)
+	}
+}
+
+func TestHandleAdminMediaByID_Delete(t *testing.T) {
+	deps, gormDB, _ := setupTestDeps(t)
+
+	// Create a real temp file for the media record
+	tmpDir := t.TempDir()
+	os.Setenv("MEDIA_DIR", tmpDir)
+	defer os.Unsetenv("MEDIA_DIR")
+
+	mediaPath := filepath.Join(tmpDir, "test.mp4")
+	os.WriteFile(mediaPath, []byte("fake video"), 0644)
+
+	gormDB.Create(&db.Media{
+		Filename:        "test.mp4",
+		OriginalName:    "test.mp4",
+		Path:            mediaPath,
+		SizeBytes:       10,
+		DurationSeconds: 1,
+		Status:          "ready",
+		Title:           "Test",
+	})
+
+	handler := HandleAdminMediaByID(deps)
+	req := httptest.NewRequest("DELETE", "/api/admin/media/1", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var count int64
+	gormDB.Model(&db.Media{}).Count(&count)
+	if count != 0 {
+		t.Errorf("media count after delete = %d, want 0", count)
+	}
+}
+
+func TestHandleAdminMediaUploads_Init(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminMediaUploads(deps)
+	body := `{"fileName":"video.mp4","fileSize":1024,"mimeType":"video/mp4","chunkSize":524288,"totalChunks":1}`
+	req := httptest.NewRequest("POST", "/api/admin/media/uploads", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	var status AdminMediaUploadStatusResponse
+	json.NewDecoder(w.Body).Decode(&status)
+	if status.FileName != "video.mp4" {
+		t.Errorf("FileName = %q, want video.mp4", status.FileName)
+	}
+	if status.UploadID == "" {
+		t.Error("UploadID is empty")
+	}
+}
+
+func TestHandleAdminMediaUploads_InvalidFile(t *testing.T) {
+	deps, _, _ := setupTestDeps(t)
+
+	handler := HandleAdminMediaUploads(deps)
+	body := `{"fileName":"bad.exe","fileSize":1024,"mimeType":"application/x-msdownload","chunkSize":524288,"totalChunks":1}`
+	req := httptest.NewRequest("POST", "/api/admin/media/uploads", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status = %d, want 400", w.Code)
+	}
+}

backend/chat/src/media/media.go

@@ -0,0 +1,385 @@
+package media
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// FormatDuration converts seconds to HH:MM:SS string.
+func FormatDuration(seconds int) string {
+	if seconds < 0 {
+		seconds = 0
+	}
+	hours := seconds / 3600
+	minutes := (seconds % 3600) / 60
+	remainingSeconds := seconds % 60
+	return fmt.Sprintf("%02d:%02d:%02d", hours, minutes, remainingSeconds)
+}
+
+// NormalizationResult holds ffprobe validation output for admin uploads.
+type NormalizationResult struct {
+	Valid  bool     `json:"valid"`
+	Errors []string `json:"errors"`
+}
+
+// ValidateNormalization runs ffprobe against a media file and checks
+// conformance with the Linear Void normalization profile (ADR-001).
+func ValidateNormalization(mediaPath string) NormalizationResult {
+	result := NormalizationResult{Valid: true, Errors: []string{}}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	out, err := exec.CommandContext(ctx,
+		"ffprobe", "-v", "quiet", "-print_format", "json", "-show_format", "-show_streams", mediaPath,
+	).CombinedOutput()
+
+	if ctx.Err() == context.DeadlineExceeded {
+		return NormalizationResult{Valid: false, Errors: []string{"ffprobe timed out"}}
+	}
+	if err != nil {
+		return NormalizationResult{Valid: false, Errors: []string{fmt.Sprintf("ffprobe failed: %v (%s)", err, strings.TrimSpace(string(out)))}}
+	}
+
+	var probe struct {
+		Streams []struct {
+			CodecName  string `json:"codec_name"`
+			CodecType  string `json:"codec_type"`
+			Width      int    `json:"width"`
+			Height     int    `json:"height"`
+			RFrameRate string `json:"r_frame_rate"`
+			PixFmt     string `json:"pix_fmt"`
+			SampleRate string `json:"sample_rate"`
+		} `json:"streams"`
+	}
+	if err := json.Unmarshal(out, &probe); err != nil {
+		return NormalizationResult{Valid: false, Errors: []string{"ffprobe JSON parse failed: " + err.Error()}}
+	}
+
+	var hasVideo, hasAudio bool
+	for _, s := range probe.Streams {
+		switch s.CodecType {
+		case "video":
+			hasVideo = true
+			if s.CodecName != "h264" {
+				result.Errors = append(result.Errors, fmt.Sprintf("video codec must be h264, got %s", s.CodecName))
+			}
+			if s.RFrameRate != "30/1" {
+				result.Errors = append(result.Errors, fmt.Sprintf("framerate must be 30 fps constant, got %s", s.RFrameRate))
+			}
+			if s.Width != 1280 && s.Width != 1920 {
+				result.Errors = append(result.Errors, fmt.Sprintf("width must be 1280 or 1920, got %d", s.Width))
+			}
+			if s.Height != 720 && s.Height != 1080 {
+				result.Errors = append(result.Errors, fmt.Sprintf("height must be 720 or 1080, got %d", s.Height))
+			}
+			if s.PixFmt != "yuv420p" {
+				result.Errors = append(result.Errors, fmt.Sprintf("pixel format must be yuv420p, got %s", s.PixFmt))
+			}
+		case "audio":
+			hasAudio = true
+			if s.CodecName != "aac" {
+				result.Errors = append(result.Errors, fmt.Sprintf("audio codec must be aac, got %s", s.CodecName))
+			}
+			if s.SampleRate != "48000" {
+				result.Errors = append(result.Errors, fmt.Sprintf("sample rate must be 48000 Hz, got %s", s.SampleRate))
+			}
+		}
+	}
+
+	if !hasVideo {
+		result.Errors = append(result.Errors, "no video stream found")
+	}
+	if !hasAudio {
+		result.Errors = append(result.Errors, "no audio stream found")
+	}
+
+	if len(result.Errors) > 0 {
+		result.Valid = false
+	}
+
+	return result
+}
+
+// ProbeDurationSeconds returns the duration of a media file in seconds.
+func ProbeDurationSeconds(mediaPath string) (int, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	out, err := exec.CommandContext(
+		ctx,
+		"ffprobe",
+		"-v", "error",
+		"-show_entries", "format=duration",
+		"-of", "default=noprint_wrappers=1:nokey=1",
+		mediaPath,
+	).CombinedOutput()
+
+	if ctx.Err() == context.DeadlineExceeded {
+		return 0, fmt.Errorf("ffprobe timed out")
+	}
+	if err != nil {
+		return 0, fmt.Errorf("ffprobe failed: %w (%s)", err, strings.TrimSpace(string(out)))
+	}
+
+	rawDuration := strings.TrimSpace(string(out))
+	if rawDuration == "" {
+		return 0, fmt.Errorf("ffprobe returned empty duration")
+	}
+
+	secondsFloat, err := strconv.ParseFloat(rawDuration, 64)
+	if err != nil {
+		return 0, fmt.Errorf("failed to parse duration %q: %w", rawDuration, err)
+	}
+	if secondsFloat < 0 {
+		secondsFloat = 0
+	}
+
+	seconds := int(secondsFloat + 0.5)
+	if secondsFloat > 0 && seconds == 0 {
+		seconds = 1
+	}
+
+	return seconds, nil
+}
+
+// DetectMime reads the first 512 bytes of a file to detect its MIME type.
+func DetectMime(filePath string) (string, error) {
+	f, err := os.Open(filePath)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	head := make([]byte, 512)
+	n, err := f.Read(head)
+	if err != nil && err != io.EOF {
+		return "", err
+	}
+
+	return strings.SplitN(http.DetectContentType(head[:n]), ";", 2)[0], nil
+}
+
+// IsAllowedExtension checks if the file extension is a supported video format.
+func IsAllowedExtension(fileName string) bool {
+	ext := strings.ToLower(filepath.Ext(fileName))
+	switch ext {
+	case ".mp4", ".mov", ".mkv", ".webm", ".m4v", ".ts":
+		return true
+	default:
+		return false
+	}
+}
+
+// IsAllowedMime checks if the MIME type is a supported video type.
+func IsAllowedMime(mime string) bool {
+	mime = strings.TrimSpace(strings.ToLower(mime))
+	if mime == "" {
+		return true
+	}
+	if strings.HasPrefix(mime, "video/") {
+		return true
+	}
+	return mime == "application/octet-stream"
+}
+
+// UniqueTargetPath returns a unique file path in mediaDir, appending -N if needed.
+func UniqueTargetPath(mediaDir, fileName string) string {
+	baseName := filepath.Base(fileName)
+	ext := filepath.Ext(baseName)
+	nameOnly := strings.TrimSuffix(baseName, ext)
+	candidate := filepath.Join(mediaDir, baseName)
+
+	for i := 1; ; i++ {
+		if _, err := os.Stat(candidate); os.IsNotExist(err) {
+			return candidate
+		}
+		candidate = filepath.Join(mediaDir, fmt.Sprintf("%s-%d%s", nameOnly, i, ext))
+	}
+}
+
+// FileEntry represents a media file for API responses.
+type FileEntry struct {
+	ID              uint   `json:"id"`
+	Name            string `json:"name"`
+	OriginalName    string `json:"originalName"`
+	Path            string `json:"path"`
+	Size            int64  `json:"size"`
+	DurationSeconds int    `json:"durationSeconds"`
+	Runtime         string `json:"runtime"`
+	Status          string `json:"status"`
+	Title           string `json:"title"`
+	Tags            string `json:"tags"`
+	UploadedAt      string `json:"uploadedAt"`
+	ModifiedAt      string `json:"modifiedAt"`
+}
+
+// MediaRecord is the interface for media DB records.
+type MediaRecord interface {
+	GetID() uint
+	GetFilename() string
+	GetOriginalName() string
+	GetPath() string
+	GetSizeBytes() int64
+	GetDurationSeconds() int
+	GetStatus() string
+	GetTitle() string
+	GetTags() string
+	GetUploadedAt() time.Time
+	GetUpdatedAt() time.Time
+}
+
+// ListFiles returns all media files sorted by upload date descending.
+func ListFiles(db *gorm.DB) ([]FileEntry, error) {
+	type record struct {
+		ID              uint
+		Filename        string
+		OriginalName    string
+		Path            string
+		SizeBytes       int64
+		DurationSeconds int
+		Status          string
+		Title           string
+		Tags            string
+		UploadedAt      time.Time
+		UpdatedAt       time.Time
+	}
+
+	var records []record
+	if err := db.Table("media").Order("uploaded_at desc").Find(&records).Error; err != nil {
+		return nil, err
+	}
+
+	files := make([]FileEntry, 0, len(records))
+	for _, r := range records {
+		files = append(files, FileEntry{
+			ID:              r.ID,
+			Name:            r.Filename,
+			OriginalName:    r.OriginalName,
+			Path:            r.Path,
+			Size:            r.SizeBytes,
+			DurationSeconds: r.DurationSeconds,
+			Runtime:         FormatDuration(r.DurationSeconds),
+			Status:          r.Status,
+			Title:           r.Title,
+			Tags:            r.Tags,
+			UploadedAt:      r.UploadedAt.UTC().Format(time.RFC3339),
+			ModifiedAt:      r.UpdatedAt.UTC().Format(time.RFC3339),
+		})
+	}
+
+	sort.Slice(files, func(i, j int) bool {
+		if files[i].UploadedAt == files[j].UploadedAt {
+			return files[i].Name < files[j].Name
+		}
+		return files[i].UploadedAt > files[j].UploadedAt
+	})
+
+	return files, nil
+}
+
+// ParsePlaylistEntries parses playlist content into schedule entries.
+type ScheduleEntry struct {
+	Index           int    `json:"index"`
+	Path            string `json:"path"`
+	Label           string `json:"label"`
+	DurationSeconds int    `json:"durationSeconds"`
+	Runtime         string `json:"runtime"`
+	Status          string `json:"status"`
+	Title           string `json:"title"`
+}
+
+// ParsePlaylist parses playlist text content into entries.
+func ParsePlaylist(content string) []ScheduleEntry {
+	entries := []ScheduleEntry{}
+	lines := strings.Split(content, "\n")
+	for _, rawLine := range lines {
+		line := strings.TrimSpace(rawLine)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		if strings.HasPrefix(line, "file ") {
+			line = strings.TrimSpace(strings.TrimPrefix(line, "file "))
+			line = strings.Trim(line, "'\"")
+		}
+
+		entries = append(entries, ScheduleEntry{
+			Index: len(entries) + 1,
+			Path:  line,
+			Label: filepath.Base(line),
+		})
+	}
+
+	return entries
+}
+
+// UploadSessionDir returns the directory for an upload session's chunks.
+func UploadSessionDir(mediaDir, uploadID string) string {
+	return filepath.Join(mediaDir, ".uploads", uploadID)
+}
+
+// UploadSessionMetaPath returns the path to the session metadata file.
+func UploadSessionMetaPath(mediaDir, uploadID string) string {
+	return filepath.Join(UploadSessionDir(mediaDir, uploadID), "session.json")
+}
+
+// UploadChunkPath returns the path for a specific chunk file.
+func UploadChunkPath(mediaDir, uploadID string, chunkIndex int) string {
+	return filepath.Join(UploadSessionDir(mediaDir, uploadID), fmt.Sprintf("chunk-%06d.part", chunkIndex))
+}
+
+// CountUploadedChunks counts how many chunks exist for a session.
+func CountUploadedChunks(mediaDir, uploadID string, totalChunks int) int {
+	uploaded := 0
+	for i := 0; i < totalChunks; i++ {
+		if _, err := os.Stat(UploadChunkPath(mediaDir, uploadID, i)); err == nil {
+			uploaded++
+		}
+	}
+	return uploaded
+}
+
+// ValidateUploadID checks that an upload ID is a valid hex string of appropriate length.
+func ValidateUploadID(uploadID string) bool {
+	if len(uploadID) < 16 || len(uploadID) > 128 {
+		return false
+	}
+	for _, r := range uploadID {
+		if (r < 'a' || r > 'f') && (r < '0' || r > '9') {
+			return false
+		}
+	}
+	return true
+}
+
+// GetMediaIDFromPath extracts a media ID from a URL path like /api/admin/media/123.
+func GetMediaIDFromPath(path, prefix string) (uint, error) {
+	if !strings.HasPrefix(path, prefix) {
+		return 0, fmt.Errorf("invalid media path")
+	}
+	idPart := strings.TrimPrefix(path, prefix)
+	idPart = strings.TrimSpace(idPart)
+	if idPart == "" || strings.Contains(idPart, "/") {
+		return 0, fmt.Errorf("invalid media id")
+	}
+
+	id, err := strconv.ParseUint(idPart, 10, 64)
+	if err != nil || id == 0 {
+		return 0, fmt.Errorf("invalid media id")
+	}
+
+	return uint(id), nil
+}

backend/chat/src/media/media_test.go

@@ -0,0 +1,204 @@
+package media
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestFormatDuration(t *testing.T) {
+	tests := []struct {
+		name     string
+		seconds  int
+		expected string
+	}{
+		{"zero", 0, "00:00:00"},
+		{"one second", 1, "00:00:01"},
+		{"one minute", 60, "00:01:00"},
+		{"one hour", 3600, "01:00:00"},
+		{"mixed", 3661, "01:01:01"},
+		{"large", 86399, "23:59:59"},
+		{"negative", -5, "00:00:00"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := FormatDuration(tt.seconds); got != tt.expected {
+				t.Errorf("FormatDuration(%d) = %q, want %q", tt.seconds, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestIsAllowedExtension(t *testing.T) {
+	tests := []struct {
+		name     string
+		expected bool
+	}{
+		{"video.mp4", true},
+		{"video.mov", true},
+		{"video.mkv", true},
+		{"video.webm", true},
+		{"video.m4v", true},
+		{"video.ts", true},
+		{"video.MP4", true},
+		{"video.avi", false},
+		{"video.flv", false},
+		{"video.wmv", false},
+		{"video", false},
+		{"", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsAllowedExtension(tt.name); got != tt.expected {
+				t.Errorf("IsAllowedExtension(%q) = %v, want %v", tt.name, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestIsAllowedMime(t *testing.T) {
+	tests := []struct {
+		mime     string
+		expected bool
+	}{
+		{"video/mp4", true},
+		{"video/quicktime", true},
+		{"video/x-matroska", true},
+		{"video/webm", true},
+		{"application/octet-stream", true},
+		{"", true},
+		{"image/jpeg", false},
+		{"audio/mpeg", false},
+		{"text/plain", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.mime, func(t *testing.T) {
+			if got := IsAllowedMime(tt.mime); got != tt.expected {
+				t.Errorf("IsAllowedMime(%q) = %v, want %v", tt.mime, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestValidateUploadID(t *testing.T) {
+	tests := []struct {
+		id       string
+		expected bool
+	}{
+		{"abcdef0123456789", true},           // 16 hex chars
+		{"abcdef0123456789abcdef0123456789", true}, // 32 hex chars
+		{"abc", false},                        // too short
+		{"abcdef012345678", false},            // 15 chars (too short)
+		{"abcdef0123456789g", false},          // non-hex char
+		{"ABCDEF0123456789", false},           // uppercase (not allowed)
+		{"", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.id, func(t *testing.T) {
+			if got := ValidateUploadID(tt.id); got != tt.expected {
+				t.Errorf("ValidateUploadID(%q) = %v, want %v", tt.id, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestParsePlaylist(t *testing.T) {
+	tests := []struct {
+		name     string
+		content  string
+		expected int
+		first    string
+	}{
+		{
+			name:     "simple",
+			content:  "/videos/video1.mp4\n/videos/video2.mp4\n",
+			expected: 2,
+			first:    "/videos/video1.mp4",
+		},
+		{
+			name:     "with file prefix",
+			content:  "file /videos/video1.mp4\nfile '/videos/video2.mp4'\n",
+			expected: 2,
+			first:    "/videos/video1.mp4",
+		},
+		{
+			name:     "with comments and blanks",
+			content:  "# comment\n\n/videos/video1.mp4\n\n# another comment\n/videos/video2.mp4\n",
+			expected: 2,
+			first:    "/videos/video1.mp4",
+		},
+		{
+			name:     "empty",
+			content:  "",
+			expected: 0,
+		},
+		{
+			name:     "only comments",
+			content:  "# comment\n# another\n",
+			expected: 0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			entries := ParsePlaylist(tt.content)
+			if len(entries) != tt.expected {
+				t.Errorf("ParsePlaylist() len = %d, want %d", len(entries), tt.expected)
+			}
+			if tt.expected > 0 && entries[0].Path != tt.first {
+				t.Errorf("ParsePlaylist()[0].Path = %q, want %q", entries[0].Path, tt.first)
+			}
+			// Check indices
+			for i, e := range entries {
+				if e.Index != i+1 {
+					t.Errorf("ParsePlaylist()[%d].Index = %d, want %d", i, e.Index, i+1)
+				}
+			}
+		})
+	}
+}
+
+func TestGetMediaIDFromPath(t *testing.T) {
+	tests := []struct {
+		path      string
+		prefix    string
+		expected  uint
+		expectErr bool
+	}{
+		{"/api/admin/media/123", "/api/admin/media/", 123, false},
+		{"/api/admin/media/1", "/api/admin/media/", 1, false},
+		{"/api/admin/media/", "/api/admin/media/", 0, true},
+		{"/api/admin/media/abc", "/api/admin/media/", 0, true},
+		{"/api/admin/media/0", "/api/admin/media/", 0, true},
+		{"/other/path", "/api/admin/media/", 0, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.path, func(t *testing.T) {
+			id, err := GetMediaIDFromPath(tt.path, tt.prefix)
+			if tt.expectErr && err == nil {
+				t.Errorf("GetMediaIDFromPath(%q) expected error, got nil", tt.path)
+			}
+			if !tt.expectErr && err != nil {
+				t.Errorf("GetMediaIDFromPath(%q) error = %v", tt.path, err)
+			}
+			if id != tt.expected {
+				t.Errorf("GetMediaIDFromPath(%q) = %d, want %d", tt.path, id, tt.expected)
+			}
+		})
+	}
+}
+
+func TestUniqueTargetPath(t *testing.T) {
+	// Test that the function returns a path with the mediaDir prefix
+	// and the correct filename. We can't easily test collision behavior
+	// without filesystem setup, but we can verify the basic path.
+	expected := filepath.Join("/tmp/media", "video.mp4")
+	path := UniqueTargetPath("/tmp/media", "video.mp4")
+	if path != expected {
+		t.Errorf("UniqueTargetPath() = %q, want %q", path, expected)
+	}
+}

backend/chat/src/metrics/metrics.go

@@ -0,0 +1,128 @@
+package metrics
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"gorm.io/gorm"
+
+	"chat/src/auth"
+	"chat/src/db"
+	"chat/src/ws"
+)
+
+// HandleMetrics returns Prometheus-format metrics for the chat service.
+func HandleMetrics(gormDB *gorm.DB, redis db.RedisClient, hub *ws.Hub, sessionStore *auth.SessionStore, dbDriver, instanceID string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		var storedMessages int64
+		if gormDB != nil {
+			_ = gormDB.Model(&db.Message{}).Count(&storedMessages).Error
+		}
+
+		var moderationActions int64
+		if gormDB != nil {
+			_ = gormDB.Model(&db.ModerationLog{}).Count(&moderationActions).Error
+		}
+
+		redisEnabled := 0
+		redisUp := 0
+		redisClients := 0
+		if redis != nil {
+			redisEnabled = 1
+			if err := redis.Ping(context.Background()); err == nil {
+				redisUp = 1
+				if info, err := redis.Info(context.Background(), "clients"); err == nil {
+					for _, line := range strings.Split(info, "\n") {
+						if strings.HasPrefix(line, "connected_clients:") {
+							if value, err := strconv.Atoi(strings.TrimSpace(strings.TrimPrefix(line, "connected_clients:"))); err == nil {
+								redisClients = value
+							}
+							break
+						}
+					}
+				}
+			}
+		}
+
+		connectedClients := 0
+		dmsSent := int64(0)
+		if hub != nil {
+			connectedClients = hub.ConnectedClients()
+			dmsSent = hub.DMsSent
+		}
+
+		activeSessions := 0
+		if sessionStore != nil {
+			activeSessions = sessionStore.CountActive()
+		}
+
+		w.Header().Set("Content-Type", "text/plain; version=0.0.4; charset=utf-8")
+
+		writeLine := func(name string, value any) {
+			fmt.Fprintf(w, "%s %v\n", name, value)
+		}
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_connected_clients Current connected WebSocket clients.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_connected_clients gauge")
+		writeLine("linearvoid_chat_connected_clients", connectedClients)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_messages_total Total stored chat messages.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_messages_total gauge")
+		writeLine("linearvoid_chat_messages_total", storedMessages)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_dms_total Total private messages sent.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_dms_total counter")
+		writeLine("linearvoid_chat_dms_total", dmsSent)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_moderation_actions_total Total moderation log entries.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_moderation_actions_total gauge")
+		writeLine("linearvoid_chat_moderation_actions_total", moderationActions)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_redis_enabled Redis configured for chat service.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_redis_enabled gauge")
+		writeLine("linearvoid_chat_redis_enabled", redisEnabled)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_redis_up Redis reachable from chat service.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_redis_up gauge")
+		writeLine("linearvoid_chat_redis_up", redisUp)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_redis_connected_clients Redis connected client count seen by chat service.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_redis_connected_clients gauge")
+		writeLine("linearvoid_chat_redis_connected_clients", redisClients)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_admin_sessions_active Active unexpired admin sessions.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_admin_sessions_active gauge")
+		writeLine("linearvoid_chat_admin_sessions_active", activeSessions)
+
+		fmt.Fprintln(w, "# HELP linearvoid_chat_build_info Static build info for chat service.")
+		fmt.Fprintln(w, "# TYPE linearvoid_chat_build_info gauge")
+		fmt.Fprintf(w, "linearvoid_chat_build_info{service=\"chat\",database_driver=\"%s\",instance_id=\"%s\"} 1\n", dbDriver, instanceID)
+	}
+}
+
+// HandleHealth returns a simple health check endpoint.
+func HandleHealth() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, `{"status":"healthy","service":"chat","timestamp":"`+time.Now().UTC().Format(time.RFC3339)+`"}`)
+	}
+}
+
+// HandleNotFound returns a 404 JSON response for all unhandled paths.
+func HandleNotFound() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprint(w, `{"error":"not found"}`)
+	}
+}

backend/chat/src/metrics/metrics_test.go

@@ -0,0 +1,190 @@
+package metrics
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+
+	"chat/src/auth"
+	"chat/src/db"
+	"chat/src/ws"
+)
+
+func TestHandleHealth(t *testing.T) {
+	handler := HandleHealth()
+	req := httptest.NewRequest("GET", "/health", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	body := w.Body.String()
+	if !strings.Contains(body, `"healthy"`) {
+		t.Errorf("body missing healthy: %s", body)
+	}
+	if !strings.Contains(body, `"chat"`) {
+		t.Errorf("body missing service name: %s", body)
+	}
+}
+
+func TestHandleNotFound(t *testing.T) {
+	handler := HandleNotFound()
+	req := httptest.NewRequest("GET", "/nonexistent", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("status = %d, want 404", w.Code)
+	}
+
+	body := w.Body.String()
+	if !strings.Contains(body, `"not found"`) {
+		t.Errorf("body missing not found: %s", body)
+	}
+}
+
+func TestHandleMetrics(t *testing.T) {
+	gormDB, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("failed to open test DB: %v", err)
+	}
+	gormDB.AutoMigrate(&db.Message{}, &db.ModerationLog{})
+
+	// Add some test data
+	gormDB.Create(&db.Message{Room: "main", Username: "u1", Text: "hi", Timestamp: time.Now(), Type: "public"})
+	gormDB.Create(&db.ModerationLog{Action: "mute", Target: "u2", Moderator: "admin", Reason: "spam", Timestamp: time.Now()})
+
+	sessionStore := auth.NewSessionStore()
+	hub := ws.NewHub(gormDB, nil, "test-instance", 10, 10*time.Second, "admin")
+	hub.DMsSent = 5
+
+	handler := HandleMetrics(gormDB, nil, hub, sessionStore, "sqlite", "test-instance")
+	req := httptest.NewRequest("GET", "/metrics", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	body := w.Body.String()
+
+	// Check required metric names
+	requiredMetrics := []string{
+		"linearvoid_chat_connected_clients",
+		"linearvoid_chat_messages_total",
+		"linearvoid_chat_dms_total",
+		"linearvoid_chat_moderation_actions_total",
+		"linearvoid_chat_redis_enabled",
+		"linearvoid_chat_redis_up",
+		"linearvoid_chat_redis_connected_clients",
+		"linearvoid_chat_admin_sessions_active",
+		"linearvoid_chat_build_info",
+	}
+
+	for _, metric := range requiredMetrics {
+		if !strings.Contains(body, metric) {
+			t.Errorf("body missing metric %s", metric)
+		}
+	}
+
+	// Check build_info has instance_id label
+	if !strings.Contains(body, `instance_id="test-instance"`) {
+		t.Error("build_info missing instance_id label")
+	}
+
+	// Check values
+	if !strings.Contains(body, "linearvoid_chat_messages_total 1") {
+		t.Error("messages_total should be 1")
+	}
+	if !strings.Contains(body, "linearvoid_chat_moderation_actions_total 1") {
+		t.Error("moderation_actions_total should be 1")
+	}
+	if !strings.Contains(body, "linearvoid_chat_dms_total 5") {
+		t.Error("dms_total should be 5")
+	}
+	if !strings.Contains(body, "linearvoid_chat_redis_enabled 0") {
+		t.Error("redis_enabled should be 0 (nil redis)")
+	}
+}
+
+func TestHandleMetrics_WrongMethod(t *testing.T) {
+	handler := HandleMetrics(nil, nil, nil, nil, "", "")
+	req := httptest.NewRequest("POST", "/metrics", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusMethodNotAllowed {
+		t.Errorf("status = %d, want 405", w.Code)
+	}
+}
+
+func TestHandleMetrics_WithRedis(t *testing.T) {
+	gormDB, _ := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	gormDB.AutoMigrate(&db.Message{}, &db.ModerationLog{})
+
+	// mockRedis for metrics test
+	mr := &metricsMockRedis{}
+	sessionStore := auth.NewSessionStore()
+	hub := ws.NewHub(gormDB, mr, "test-instance", 10, 10*time.Second, "admin")
+
+	handler := HandleMetrics(gormDB, mr, hub, sessionStore, "sqlite", "inst-123")
+	req := httptest.NewRequest("GET", "/metrics", nil)
+	w := httptest.NewRecorder()
+
+	handler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	body := w.Body.String()
+	if !strings.Contains(body, "linearvoid_chat_redis_enabled 1") {
+		t.Error("redis_enabled should be 1")
+	}
+	if !strings.Contains(body, "linearvoid_chat_redis_up 1") {
+		t.Error("redis_up should be 1")
+	}
+	if !strings.Contains(body, "linearvoid_chat_redis_connected_clients 5") {
+		t.Error("redis_connected_clients should be 5")
+	}
+}
+
+// metricsMockRedis is a minimal mock for metrics tests.
+type metricsMockRedis struct{}
+
+func (m *metricsMockRedis) Ping(ctx context.Context) error { return nil }
+func (m *metricsMockRedis) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
+	return nil
+}
+func (m *metricsMockRedis) Get(ctx context.Context, key string) (string, error) { return "", nil }
+func (m *metricsMockRedis) Del(ctx context.Context, keys ...string) error       { return nil }
+func (m *metricsMockRedis) Incr(ctx context.Context, key string) (int64, error) { return 0, nil }
+func (m *metricsMockRedis) Decr(ctx context.Context, key string) (int64, error) { return 0, nil }
+func (m *metricsMockRedis) Expire(ctx context.Context, key string, expiration time.Duration) error {
+	return nil
+}
+func (m *metricsMockRedis) Exists(ctx context.Context, keys ...string) (int64, error) { return 0, nil }
+func (m *metricsMockRedis) Publish(ctx context.Context, channel string, message interface{}) error {
+	return nil
+}
+func (m *metricsMockRedis) PSubscribe(ctx context.Context, channels ...string) db.PubSub { return nil }
+func (m *metricsMockRedis) Scan(ctx context.Context, cursor uint64, match string, count int64) ([]string, uint64, error) {
+	return nil, 0, nil
+}
+func (m *metricsMockRedis) Info(ctx context.Context, sections ...string) (string, error) {
+	return "connected_clients:5\nused_memory_human:1M\n", nil
+}
+func (m *metricsMockRedis) Close() error { return nil }

backend/chat/src/ratelimit/ratelimit.go

@@ -0,0 +1,75 @@
+package ratelimit
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// RedisClient is the subset of Redis operations needed for rate limiting.
+type RedisClient interface {
+	Incr(ctx context.Context, key string) (int64, error)
+	Expire(ctx context.Context, key string, expiration time.Duration) error
+	Decr(ctx context.Context, key string) (int64, error)
+}
+
+// CheckMessageRate checks if a user has exceeded the message rate limit.
+// Returns true if allowed, false if rate limited.
+func CheckMessageRate(ctx context.Context, redis RedisClient, username string, max int, window time.Duration) (bool, error) {
+	if redis == nil {
+		return true, nil // No Redis = no rate limiting
+	}
+	key := fmt.Sprintf("rate:%s", username)
+	count, err := redis.Incr(ctx, key)
+	if err != nil {
+		return true, err // Fail open on Redis error
+	}
+	if count == 1 {
+		_ = redis.Expire(ctx, key, window)
+	}
+	return count <= int64(max), nil
+}
+
+// CheckLoginRate checks if an IP has exceeded the login attempt limit.
+// Returns true if allowed, false if rate limited.
+func CheckLoginRate(ctx context.Context, redis RedisClient, clientIP string) (bool, error) {
+	if redis == nil {
+		return true, nil
+	}
+	key := fmt.Sprintf("login_attempts:%s", clientIP)
+	count, err := redis.Incr(ctx, key)
+	if err != nil {
+		return true, err
+	}
+	if count == 1 {
+		_ = redis.Expire(ctx, key, 5*time.Minute)
+	}
+	return count <= 5, nil
+}
+
+// CheckWSConnRate checks if an IP has exceeded the WebSocket connection limit.
+// Returns true if allowed, false if rate limited.
+// Caller must call Decr on disconnect.
+func CheckWSConnRate(ctx context.Context, redis RedisClient, clientIP string) (bool, error) {
+	if redis == nil {
+		return true, nil
+	}
+	key := fmt.Sprintf("ws_conn:%s", clientIP)
+	count, err := redis.Incr(ctx, key)
+	if err != nil {
+		return true, err
+	}
+	if count == 1 {
+		_ = redis.Expire(ctx, key, 60*time.Second)
+	}
+	return count <= 5, nil
+}
+
+// DecrWSConn decrements the WebSocket connection counter for an IP.
+func DecrWSConn(ctx context.Context, redis RedisClient, clientIP string) {
+	if redis == nil {
+		return
+	}
+	key := fmt.Sprintf("ws_conn:%s", clientIP)
+	_, _ = redis.Decr(ctx, key)
+}

backend/chat/src/ratelimit/ratelimit_test.go

@@ -0,0 +1,190 @@
+package ratelimit
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+)
+
+// mockRedis implements RedisClient for testing.
+type mockRedis struct {
+	mu    sync.Mutex
+	store map[string]int64
+}
+
+func newMockRedis() *mockRedis {
+	return &mockRedis{store: make(map[string]int64)}
+}
+
+func (m *mockRedis) Incr(ctx context.Context, key string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.store[key]++
+	return m.store[key], nil
+}
+
+func (m *mockRedis) Expire(ctx context.Context, key string, expiration time.Duration) error {
+	return nil
+}
+
+func (m *mockRedis) Decr(ctx context.Context, key string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.store[key]--
+	return m.store[key], nil
+}
+
+func TestCheckMessageRate(t *testing.T) {
+	redis := newMockRedis()
+	ctx := context.Background()
+
+	// First 10 messages allowed
+	for i := 0; i < 10; i++ {
+		allowed, err := CheckMessageRate(ctx, redis, "user1", 10, 10*time.Second)
+		if err != nil {
+			t.Fatalf("CheckMessageRate #%d error = %v", i+1, err)
+		}
+		if !allowed {
+			t.Errorf("CheckMessageRate #%d = false, want true", i+1)
+		}
+	}
+
+	// 11th message blocked
+	allowed, err := CheckMessageRate(ctx, redis, "user1", 10, 10*time.Second)
+	if err != nil {
+		t.Fatalf("CheckMessageRate #11 error = %v", err)
+	}
+	if allowed {
+		t.Error("CheckMessageRate #11 = true, want false (rate limited)")
+	}
+
+	// Different user not affected
+	allowed, err = CheckMessageRate(ctx, redis, "user2", 10, 10*time.Second)
+	if err != nil {
+		t.Fatalf("CheckMessageRate user2 error = %v", err)
+	}
+	if !allowed {
+		t.Error("CheckMessageRate user2 = false, want true")
+	}
+}
+
+func TestCheckMessageRate_NilRedis(t *testing.T) {
+	allowed, err := CheckMessageRate(context.Background(), nil, "user1", 10, 10*time.Second)
+	if err != nil {
+		t.Fatalf("CheckMessageRate nil redis error = %v", err)
+	}
+	if !allowed {
+		t.Error("CheckMessageRate nil redis = false, want true (fail open)")
+	}
+}
+
+func TestCheckLoginRate(t *testing.T) {
+	redis := newMockRedis()
+	ctx := context.Background()
+
+	// First 5 attempts allowed
+	for i := 0; i < 5; i++ {
+		allowed, err := CheckLoginRate(ctx, redis, "192.168.1.1")
+		if err != nil {
+			t.Fatalf("CheckLoginRate #%d error = %v", i+1, err)
+		}
+		if !allowed {
+			t.Errorf("CheckLoginRate #%d = false, want true", i+1)
+		}
+	}
+
+	// 6th attempt blocked
+	allowed, err := CheckLoginRate(ctx, redis, "192.168.1.1")
+	if err != nil {
+		t.Fatalf("CheckLoginRate #6 error = %v", err)
+	}
+	if allowed {
+		t.Error("CheckLoginRate #6 = true, want false (rate limited)")
+	}
+
+	// Different IP not affected
+	allowed, err = CheckLoginRate(ctx, redis, "10.0.0.1")
+	if err != nil {
+		t.Fatalf("CheckLoginRate other IP error = %v", err)
+	}
+	if !allowed {
+		t.Error("CheckLoginRate other IP = false, want true")
+	}
+}
+
+func TestCheckLoginRate_NilRedis(t *testing.T) {
+	allowed, err := CheckLoginRate(context.Background(), nil, "192.168.1.1")
+	if err != nil {
+		t.Fatalf("CheckLoginRate nil redis error = %v", err)
+	}
+	if !allowed {
+		t.Error("CheckLoginRate nil redis = false, want true (fail open)")
+	}
+}
+
+func TestCheckWSConnRate(t *testing.T) {
+	redis := newMockRedis()
+	ctx := context.Background()
+
+	// First 5 connections allowed
+	for i := 0; i < 5; i++ {
+		allowed, err := CheckWSConnRate(ctx, redis, "192.168.1.1")
+		if err != nil {
+			t.Fatalf("CheckWSConnRate #%d error = %v", i+1, err)
+		}
+		if !allowed {
+			t.Errorf("CheckWSConnRate #%d = false, want true", i+1)
+		}
+	}
+
+	// 6th connection blocked
+	allowed, err := CheckWSConnRate(ctx, redis, "192.168.1.1")
+	if err != nil {
+		t.Fatalf("CheckWSConnRate #6 error = %v", err)
+	}
+	if allowed {
+		t.Error("CheckWSConnRate #6 = true, want false (rate limited)")
+	}
+}
+
+func TestCheckWSConnRate_NilRedis(t *testing.T) {
+	allowed, err := CheckWSConnRate(context.Background(), nil, "192.168.1.1")
+	if err != nil {
+		t.Fatalf("CheckWSConnRate nil redis error = %v", err)
+	}
+	if !allowed {
+		t.Error("CheckWSConnRate nil redis = false, want true (fail open)")
+	}
+}
+
+func TestDecrWSConn(t *testing.T) {
+	redis := newMockRedis()
+	ctx := context.Background()
+
+	// Increment to 5
+	for i := 0; i < 5; i++ {
+		CheckWSConnRate(ctx, redis, "192.168.1.1")
+	}
+
+	// 6th should be blocked
+	allowed, _ := CheckWSConnRate(ctx, redis, "192.168.1.1")
+	if allowed {
+		t.Error("6th connection should be blocked")
+	}
+
+	// Decrement twice (simulate 2 disconnects)
+	DecrWSConn(ctx, redis, "192.168.1.1")
+	DecrWSConn(ctx, redis, "192.168.1.1")
+
+	// Now should be allowed again (counter 6→4, then incr→5)
+	allowed, _ = CheckWSConnRate(ctx, redis, "192.168.1.1")
+	if !allowed {
+		t.Error("after 2x DecrWSConn, connection should be allowed")
+	}
+}
+
+func TestDecrWSConn_NilRedis(t *testing.T) {
+	// Should not panic
+	DecrWSConn(context.Background(), nil, "192.168.1.1")
+}

backend/chat/src/ws/ws.go

@@ -0,0 +1,434 @@
+package ws
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+	"gorm.io/gorm"
+
+	"chat/src/db"
+	"chat/src/ratelimit"
+)
+
+// Upgrader is the WebSocket upgrader configuration.
+var Upgrader = websocket.Upgrader{
+	CheckOrigin: func(r *http.Request) bool { return true },
+}
+
+// ClientInfo stores metadata about a connected WebSocket client.
+type ClientInfo struct {
+	Username string
+	Room     string
+}
+
+// Hub manages all WebSocket connections and message routing.
+type Hub struct {
+	mu          sync.Mutex
+	clients     map[*websocket.Conn]bool
+	clientMeta  map[*websocket.Conn]ClientInfo
+	DB          *gorm.DB
+	Redis       db.RedisClient
+	InstanceID  string
+	RateLimitMax    int
+	RateLimitWindow time.Duration
+	AdminUsername   string
+	DMsSent         int64
+}
+
+// NewHub creates a new WebSocket hub.
+func NewHub(gormDB *gorm.DB, redis db.RedisClient, instanceID string, rateMax int, rateWindow time.Duration, adminUser string) *Hub {
+	return &Hub{
+		clients:         make(map[*websocket.Conn]bool),
+		clientMeta:      make(map[*websocket.Conn]ClientInfo),
+		DB:              gormDB,
+		Redis:           redis,
+		InstanceID:      instanceID,
+		RateLimitMax:    rateMax,
+		RateLimitWindow: rateWindow,
+		AdminUsername:   adminUser,
+	}
+}
+
+// ConnectedClients returns the number of currently connected clients.
+func (h *Hub) ConnectedClients() int {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	return len(h.clients)
+}
+
+// Broadcast sends a message to all connected clients and persists to DB.
+func (h *Hub) Broadcast(msg db.Message) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	// Persist to configured SQL backend.
+	if h.DB != nil {
+		h.DB.Create(&msg)
+	}
+
+	// Local fan-out
+	for client := range h.clients {
+		if err := client.WriteJSON(msg); err != nil {
+			client.Close()
+			delete(h.clients, client)
+			delete(h.clientMeta, client)
+		}
+	}
+
+	// Redis pub/sub for multi-instance fan-out
+	if h.Redis != nil && msg.Room != "" {
+		payload, _ := json.Marshal(map[string]any{
+			"instance": h.InstanceID,
+			"msg":      msg,
+		})
+		_ = h.Redis.Publish(context.Background(), fmt.Sprintf("room:%s:messages", msg.Room), payload)
+	}
+}
+
+// PushChatHistory sends the last N messages for a room via WebSocket.
+func (h *Hub) PushChatHistory(conn *websocket.Conn, room string, limit int) {
+	if h.DB == nil || room == "" {
+		return
+	}
+	var messages []db.Message
+	h.DB.Where("room = ?", room).Order("timestamp desc").Limit(limit).Find(&messages)
+	// Reverse to chronological order
+	for i := len(messages)/2 - 1; i >= 0; i-- {
+		opp := len(messages) - 1 - i
+		messages[i], messages[opp] = messages[opp], messages[i]
+	}
+	for _, msg := range messages {
+		conn.WriteJSON(msg)
+	}
+}
+
+// HandleConnection handles a new WebSocket connection.
+func (h *Hub) HandleConnection(w http.ResponseWriter, r *http.Request) {
+	clientIP := r.Header.Get("X-Forwarded-For")
+	if clientIP == "" {
+		clientIP = r.RemoteAddr
+	}
+
+	// IP-based connection rate limiting
+	allowed, err := ratelimit.CheckWSConnRate(context.Background(), h.Redis, clientIP)
+	if err != nil {
+		log.Printf("WS rate limit check error: %v", err)
+	}
+	if !allowed {
+		http.Error(w, "too many connections from this IP", http.StatusTooManyRequests)
+		return
+	}
+	defer ratelimit.DecrWSConn(context.Background(), h.Redis, clientIP)
+
+	conn, err := Upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println("Upgrade error:", err)
+		return
+	}
+
+	username := r.URL.Query().Get("username")
+	room := r.URL.Query().Get("room")
+	if username == "" {
+		username = fmt.Sprintf("anon_%d", time.Now().UnixNano()%10000)
+	}
+
+	h.mu.Lock()
+	h.clients[conn] = true
+	h.clientMeta[conn] = ClientInfo{Username: username, Room: room}
+	h.mu.Unlock()
+
+	// Announce presence (ADR-007)
+	if h.Redis != nil && room != "" {
+		_ = h.Redis.Set(context.Background(), fmt.Sprintf("presence:%s:%s", room, username), "online", 60*time.Second)
+		h.Broadcast(db.Message{Room: room, Username: "system", Text: username + " joined " + room, Type: "system", Timestamp: time.Now()})
+	}
+
+	// Push chat history on join (last 50 messages)
+	h.PushChatHistory(conn, room, 50)
+
+	// Heartbeat goroutine: refresh presence TTL every 30s
+	heartbeatStop := make(chan struct{})
+	go func() {
+		ticker := time.NewTicker(30 * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				if h.Redis != nil && room != "" {
+					_ = h.Redis.Set(context.Background(), fmt.Sprintf("presence:%s:%s", room, username), "online", 60*time.Second)
+				}
+				// Ping to detect dead connections
+				if err := conn.WriteMessage(websocket.PingMessage, nil); err != nil {
+					return
+				}
+			case <-heartbeatStop:
+				return
+			}
+		}
+	}()
+
+	defer func() {
+		close(heartbeatStop)
+		h.mu.Lock()
+		delete(h.clients, conn)
+		delete(h.clientMeta, conn)
+		h.mu.Unlock()
+		if h.Redis != nil && room != "" {
+			_ = h.Redis.Del(context.Background(), fmt.Sprintf("presence:%s:%s", room, username))
+			h.Broadcast(db.Message{Room: room, Username: "system", Text: username + " left " + room, Type: "system", Timestamp: time.Now()})
+		}
+		conn.Close()
+	}()
+
+	for {
+		var msg db.Message
+		if err := conn.ReadJSON(&msg); err != nil {
+			break
+		}
+
+		msg.Timestamp = time.Now()
+		msg.Username = username // enforce from query param for security
+
+		// Check if banned before processing
+		if h.Redis != nil {
+			if isBanned, _ := h.Redis.Exists(context.Background(), fmt.Sprintf("banned:%s", username)); isBanned > 0 {
+				conn.WriteJSON(db.Message{Type: "system", Text: "You are banned from chat.", Timestamp: time.Now()})
+				continue
+			}
+			if isMuted, _ := h.Redis.Exists(context.Background(), fmt.Sprintf("muted:%s", username)); isMuted > 0 {
+				conn.WriteJSON(db.Message{Type: "system", Text: "You are muted.", Timestamp: time.Now()})
+				continue
+			}
+		}
+
+		// Rate limiting check
+		allowed, _ := ratelimit.CheckMessageRate(context.Background(), h.Redis, msg.Username, h.RateLimitMax, h.RateLimitWindow)
+		if !allowed {
+			conn.WriteJSON(db.Message{Type: "system", Text: "Rate limit exceeded. Please slow down.", Timestamp: time.Now()})
+			continue
+		}
+
+		// Handle moderation commands
+		if strings.HasPrefix(msg.Text, "/mod ") || strings.HasPrefix(msg.Text, "/mute ") || strings.HasPrefix(msg.Text, "/ban ") {
+			h.handleModerationCommand(msg, conn)
+			continue
+		}
+
+		// Handle private DMs
+		if strings.HasPrefix(msg.Room, "dm:") {
+			h.handlePrivateDM(msg)
+			continue
+		}
+
+		msg.Type = "public"
+		log.Printf("Chat message in room %s from %s: %s", msg.Room, msg.Username, msg.Text)
+		h.Broadcast(msg)
+	}
+}
+
+// handlePrivateDM routes private messages to the specific user pair.
+func (h *Hub) handlePrivateDM(msg db.Message) {
+	msg.Type = "private"
+	h.DMsSent++
+
+	// Persist for history
+	if h.DB != nil {
+		h.DB.Create(&msg)
+	}
+
+	// Deliver to target if online
+	h.mu.Lock()
+	targetOnline := false
+	for conn, info := range h.clientMeta {
+		if info.Username == msg.Room || strings.Contains(msg.Room, info.Username) {
+			if err := conn.WriteJSON(msg); err == nil {
+				targetOnline = true
+			}
+		}
+	}
+	h.mu.Unlock()
+
+	if !targetOnline {
+		log.Printf("DM stored for offline user: %s -> room %s", msg.Username, msg.Room)
+	}
+
+	// Also deliver to sender for confirmation
+	h.mu.Lock()
+	for conn, info := range h.clientMeta {
+		if info.Username == msg.Username {
+			conn.WriteJSON(msg)
+			break
+		}
+	}
+	h.mu.Unlock()
+
+	log.Printf("Private DM from %s to room %s: %s", msg.Username, msg.Room, msg.Text)
+}
+
+// logModerationAction logs an action to the immutable ModerationLog table.
+func (h *Hub) logModerationAction(action, target, moderator, reason string) {
+	logEntry := db.ModerationLog{
+		Action:    action,
+		Target:    target,
+		Moderator: moderator,
+		Reason:    reason,
+		Timestamp: time.Now(),
+	}
+	if h.DB != nil {
+		h.DB.Create(&logEntry)
+	}
+	log.Printf("Moderation action logged: %s %s by %s - %s", action, target, moderator, reason)
+}
+
+// handleModerationCommand processes /mod, /mute, /ban commands.
+func (h *Hub) handleModerationCommand(msg db.Message, conn *websocket.Conn) {
+	parts := strings.Fields(msg.Text)
+	if len(parts) < 3 {
+		conn.WriteJSON(db.Message{Type: "system", Text: "Usage: /mute <user> <duration_m> <reason> or /ban <user> <reason>", Timestamp: time.Now()})
+		return
+	}
+
+	if msg.Username != h.AdminUsername {
+		conn.WriteJSON(db.Message{Type: "system", Text: "Only moderators can use moderation commands.", Timestamp: time.Now()})
+		return
+	}
+
+	action := strings.TrimPrefix(parts[0], "/")
+	target := parts[1]
+	reason := strings.Join(parts[2:], " ")
+
+	if h.Redis != nil {
+		switch action {
+		case "mute", "mod":
+			durationMinutes := 10 // default
+			if len(parts) >= 3 {
+				if d, err := strconv.Atoi(parts[2]); err == nil && d > 0 {
+					durationMinutes = d
+					if len(parts) > 3 {
+						reason = strings.Join(parts[3:], " ")
+					} else {
+						reason = "no reason given"
+					}
+				}
+			}
+			_ = h.Redis.Set(context.Background(), fmt.Sprintf("muted:%s", target), "1", time.Duration(durationMinutes)*time.Minute)
+		case "ban":
+			_ = h.Redis.Set(context.Background(), fmt.Sprintf("banned:%s", target), "1", 0) // no expiry
+		}
+	}
+
+	h.logModerationAction(action, target, msg.Username, reason)
+
+	h.Broadcast(db.Message{
+		Room:      msg.Room,
+		Username:  "system",
+		Type:      "system",
+		Text:      fmt.Sprintf("%s was %s by %s: %s", target, action, msg.Username, reason),
+		Timestamp: time.Now(),
+	})
+}
+
+// SubscribeRoomMessages listens for Redis pub/sub messages and fans out locally.
+func (h *Hub) SubscribeRoomMessages() {
+	if h.Redis == nil {
+		return
+	}
+	pubsub := h.Redis.PSubscribe(context.Background(), "room:*:messages")
+	defer pubsub.Close()
+
+	log.Printf("Redis pub/sub subscriber started (instance %s)", h.InstanceID)
+
+	for {
+		msg, err := pubsub.ReceiveMessage(context.Background())
+		if err != nil {
+			log.Printf("Redis pub/sub error: %v — retrying in 5s", err)
+			time.Sleep(5 * time.Second)
+			pubsub = h.Redis.PSubscribe(context.Background(), "room:*:messages")
+			continue
+		}
+
+		var envelope struct {
+			Instance string     `json:"instance"`
+			Msg      db.Message `json:"msg"`
+		}
+		if err := json.Unmarshal([]byte(msg.Payload), &envelope); err != nil {
+			continue
+		}
+
+		// Skip messages originating from this instance
+		if envelope.Instance == h.InstanceID {
+			continue
+		}
+
+		// Fan out to local clients
+		h.mu.Lock()
+		for client := range h.clients {
+			client.WriteJSON(envelope.Msg)
+		}
+		h.mu.Unlock()
+	}
+}
+
+// ScanPresence returns all active presence entries from Redis.
+func (h *Hub) ScanPresence(ctx context.Context) ([]db.Presence, error) {
+	if h.Redis == nil {
+		return nil, nil
+	}
+	keys, _, err := h.Redis.Scan(ctx, 0, "presence:*", 200)
+	if err != nil {
+		return nil, err
+	}
+	var presences []db.Presence
+	for _, key := range keys {
+		parts := strings.SplitN(key, ":", 3)
+		if len(parts) != 3 {
+			continue
+		}
+		presences = append(presences, db.Presence{
+			Room:     parts[1],
+			Username: parts[2],
+			Online:   true,
+		})
+	}
+	return presences, nil
+}
+
+// MuteUser mutes a user for a duration.
+func (h *Hub) MuteUser(ctx context.Context, username string, duration time.Duration) error {
+	if h.Redis == nil {
+		return fmt.Errorf("redis unavailable")
+	}
+	return h.Redis.Set(ctx, fmt.Sprintf("muted:%s", username), "1", duration)
+}
+
+// UnmuteUser removes a mute.
+func (h *Hub) UnmuteUser(ctx context.Context, username string) error {
+	if h.Redis == nil {
+		return fmt.Errorf("redis unavailable")
+	}
+	return h.Redis.Del(ctx, fmt.Sprintf("muted:%s", username))
+}
+
+// BanUser bans a user permanently.
+func (h *Hub) BanUser(ctx context.Context, username string) error {
+	if h.Redis == nil {
+		return fmt.Errorf("redis unavailable")
+	}
+	return h.Redis.Set(ctx, fmt.Sprintf("banned:%s", username), "1", 0)
+}
+
+// UnbanUser removes a ban.
+func (h *Hub) UnbanUser(ctx context.Context, username string) error {
+	if h.Redis == nil {
+		return fmt.Errorf("redis unavailable")
+	}
+	return h.Redis.Del(ctx, fmt.Sprintf("banned:%s", username))
+}

backend/chat/src/ws/ws_test.go

@@ -0,0 +1,563 @@
+package ws
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"github.com/gorilla/websocket"
+	"gorm.io/gorm"
+
+	"chat/src/db"
+)
+
+// mockRedis implements db.RedisClient for testing.
+type mockRedis struct {
+	mu      sync.Mutex
+	store   map[string]string
+	pubsubs []*mockPubSub
+}
+
+func newMockRedis() *mockRedis {
+	return &mockRedis{store: make(map[string]string)}
+}
+
+func (m *mockRedis) Ping(ctx context.Context) error { return nil }
+func (m *mockRedis) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.store[key] = value.(string)
+	return nil
+}
+func (m *mockRedis) Get(ctx context.Context, key string) (string, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.store[key], nil
+}
+func (m *mockRedis) Del(ctx context.Context, keys ...string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, k := range keys {
+		delete(m.store, k)
+	}
+	return nil
+}
+func (m *mockRedis) Incr(ctx context.Context, key string) (int64, error) { return 0, nil }
+func (m *mockRedis) Decr(ctx context.Context, key string) (int64, error) { return 0, nil }
+func (m *mockRedis) Expire(ctx context.Context, key string, expiration time.Duration) error {
+	return nil
+}
+func (m *mockRedis) Exists(ctx context.Context, keys ...string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, k := range keys {
+		if _, ok := m.store[k]; ok {
+			return 1, nil
+		}
+	}
+	return 0, nil
+}
+func (m *mockRedis) Publish(ctx context.Context, channel string, message interface{}) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	payload, _ := json.Marshal(message)
+	for _, ps := range m.pubsubs {
+		ps.messages <- &db.PubSubMessage{Channel: channel, Payload: string(payload)}
+	}
+	return nil
+}
+func (m *mockRedis) PSubscribe(ctx context.Context, channels ...string) db.PubSub {
+	ps := &mockPubSub{messages: make(chan *db.PubSubMessage, 100)}
+	m.mu.Lock()
+	m.pubsubs = append(m.pubsubs, ps)
+	m.mu.Unlock()
+	return ps
+}
+func (m *mockRedis) Scan(ctx context.Context, cursor uint64, match string, count int64) ([]string, uint64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var keys []string
+	for k := range m.store {
+		if strings.Contains(k, strings.TrimSuffix(match, "*")) {
+			keys = append(keys, k)
+		}
+	}
+	return keys, 0, nil
+}
+func (m *mockRedis) Info(ctx context.Context, sections ...string) (string, error) { return "", nil }
+func (m *mockRedis) Close() error                                                   { return nil }
+
+type mockPubSub struct {
+	messages chan *db.PubSubMessage
+}
+
+func (m *mockPubSub) ReceiveMessage(ctx context.Context) (*db.PubSubMessage, error) {
+	select {
+	case msg := <-m.messages:
+		return msg, nil
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+func (m *mockPubSub) Close() error { return nil }
+
+func setupTestHub(t *testing.T) (*Hub, *gorm.DB, *mockRedis) {
+	t.Helper()
+	gormDB, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("failed to open test DB: %v", err)
+	}
+	gormDB.AutoMigrate(&db.Message{}, &db.ModerationLog{})
+	mr := newMockRedis()
+	hub := NewHub(gormDB, mr, "test-instance", 10, 10*time.Second, "admin")
+	return hub, gormDB, mr
+}
+
+func setupWSServer(hub *Hub) *httptest.Server {
+	return httptest.NewServer(http.HandlerFunc(hub.HandleConnection))
+}
+
+// wsClient wraps a websocket.Conn with a channel-based read helper.
+type wsClient struct {
+	conn   *websocket.Conn
+	msgs   chan db.Message
+	errors chan error
+	done   chan struct{}
+}
+
+func newWSClient(t *testing.T, url string) *wsClient {
+	t.Helper()
+	conn, _, err := websocket.DefaultDialer.Dial(url, nil)
+	if err != nil {
+		t.Fatalf("Dial error: %v", err)
+	}
+	wc := &wsClient{
+		conn:   conn,
+		msgs:   make(chan db.Message, 100),
+		errors: make(chan error, 1),
+		done:   make(chan struct{}),
+	}
+	go wc.readLoop()
+	return wc
+}
+
+func (wc *wsClient) readLoop() {
+	defer close(wc.msgs)
+	for {
+		var msg db.Message
+		if err := wc.conn.ReadJSON(&msg); err != nil {
+			wc.errors <- err
+			return
+		}
+		select {
+		case wc.msgs <- msg:
+		case <-wc.done:
+			return
+		}
+	}
+}
+
+func (wc *wsClient) close() {
+	close(wc.done)
+	wc.conn.Close()
+}
+
+// recvMsg reads the next message with a timeout.
+func (wc *wsClient) recvMsg(timeout time.Duration) (*db.Message, error) {
+	select {
+	case msg := <-wc.msgs:
+		return &msg, nil
+	case err := <-wc.errors:
+		return nil, err
+	case <-time.After(timeout):
+		return nil, context.DeadlineExceeded
+	}
+}
+
+// skipSystem reads and discards system messages.
+func (wc *wsClient) skipSystem(timeout time.Duration) {
+	for {
+		msg, err := wc.recvMsg(timeout)
+		if err != nil || msg.Type != "system" {
+			return
+		}
+	}
+}
+
+func (wc *wsClient) writeJSON(v interface{}) error {
+	return wc.conn.WriteJSON(v)
+}
+
+func TestHub_Broadcast(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+
+	msg := db.Message{
+		Room:      "main",
+		Username:  "user1",
+		Text:      "hello",
+		Timestamp: time.Now(),
+		Type:      "public",
+	}
+	hub.Broadcast(msg)
+
+	var count int64
+	hub.DB.Model(&db.Message{}).Count(&count)
+	if count != 1 {
+		t.Errorf("message count = %d, want 1", count)
+	}
+}
+
+func TestHub_ConnectedClients(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	if hub.ConnectedClients() != 0 {
+		t.Errorf("ConnectedClients() = %d, want 0", hub.ConnectedClients())
+	}
+}
+
+func TestHub_WebSocketConnection(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=testuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	msg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if !strings.Contains(msg.Text, "joined") {
+		t.Errorf("expected join message, got text=%s", msg.Text)
+	}
+
+	if hub.ConnectedClients() != 1 {
+		t.Errorf("ConnectedClients() = %d, want 1", hub.ConnectedClients())
+	}
+}
+
+func TestHub_SendMessage(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=testuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	wc.skipSystem(2 * time.Second)
+
+	if err := wc.writeJSON(db.Message{Room: "main", Text: "hello world"}); err != nil {
+		t.Fatalf("writeJSON error: %v", err)
+	}
+
+	recvMsg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if recvMsg.Text != "hello world" {
+		t.Errorf("recvMsg.Text = %q, want hello world", recvMsg.Text)
+	}
+	if recvMsg.Username != "testuser" {
+		t.Errorf("recvMsg.Username = %q, want testuser", recvMsg.Username)
+	}
+	if recvMsg.Type != "public" {
+		t.Errorf("recvMsg.Type = %q, want public", recvMsg.Type)
+	}
+}
+
+func TestHub_Disconnect(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=testuser&room=main"
+	wc := newWSClient(t, wsURL)
+	wc.skipSystem(2 * time.Second)
+
+	if hub.ConnectedClients() != 1 {
+		t.Errorf("ConnectedClients() = %d, want 1", hub.ConnectedClients())
+	}
+
+	wc.close()
+	time.Sleep(200 * time.Millisecond)
+
+	if hub.ConnectedClients() != 0 {
+		t.Errorf("ConnectedClients() after close = %d, want 0", hub.ConnectedClients())
+	}
+}
+
+func TestHub_BannedUser(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	mr.Set(context.Background(), "banned:testuser", "1", 0)
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=testuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	wc.skipSystem(2 * time.Second)
+	wc.writeJSON(db.Message{Room: "main", Text: "hello"})
+
+	recvMsg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if !strings.Contains(recvMsg.Text, "banned") {
+		t.Errorf("expected banned message, got %q", recvMsg.Text)
+	}
+}
+
+func TestHub_MutedUser(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	mr.Set(context.Background(), "muted:testuser", "1", 0)
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=testuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	wc.skipSystem(2 * time.Second)
+	wc.writeJSON(db.Message{Room: "main", Text: "hello"})
+
+	recvMsg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if !strings.Contains(recvMsg.Text, "muted") {
+		t.Errorf("expected muted message, got %q", recvMsg.Text)
+	}
+}
+
+func TestHub_ModerationCommand(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=admin&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	wc.skipSystem(2 * time.Second)
+	wc.writeJSON(db.Message{Room: "main", Text: "/mute baduser 5 spamming"})
+
+	recvMsg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if !strings.Contains(recvMsg.Text, "mute") {
+		t.Errorf("expected mute broadcast, got text=%s", recvMsg.Text)
+	}
+
+	var count int64
+	hub.DB.Model(&db.ModerationLog{}).Count(&count)
+	if count != 1 {
+		t.Errorf("moderation log count = %d, want 1", count)
+	}
+}
+
+func TestHub_NonAdminModerationCommand(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=regularuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	wc.skipSystem(2 * time.Second)
+	wc.writeJSON(db.Message{Room: "main", Text: "/mute baduser 5 spamming"})
+
+	recvMsg, err := wc.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("recvMsg error: %v", err)
+	}
+	if !strings.Contains(recvMsg.Text, "Only moderators") {
+		t.Errorf("expected moderator-only message, got %q", recvMsg.Text)
+	}
+}
+
+func TestHub_PrivateDM(t *testing.T) {
+	hub, _, _ := setupTestHub(t)
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http")
+	wc1 := newWSClient(t, wsURL+"?username=alice&room=main")
+	defer wc1.close()
+	wc2 := newWSClient(t, wsURL+"?username=bob&room=main")
+	defer wc2.close()
+
+	wc1.skipSystem(2 * time.Second)
+	wc2.skipSystem(2 * time.Second)
+
+	wc1.writeJSON(db.Message{Room: "dm:bob", Text: "hey bob"})
+
+	recvMsg, err := wc2.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("bob recvMsg error: %v", err)
+	}
+	if recvMsg.Type != "private" {
+		t.Errorf("expected private type, got %s", recvMsg.Type)
+	}
+	if recvMsg.Text != "hey bob" {
+		t.Errorf("expected 'hey bob', got %q", recvMsg.Text)
+	}
+
+	recvMsg2, err := wc1.recvMsg(2 * time.Second)
+	if err != nil {
+		t.Fatalf("alice recvMsg error: %v", err)
+	}
+	if recvMsg2.Type != "private" {
+		t.Errorf("expected private confirmation, got %s", recvMsg2.Type)
+	}
+}
+
+func TestHub_PushChatHistory(t *testing.T) {
+	hub, gormDB, _ := setupTestHub(t)
+
+	for i := 0; i < 5; i++ {
+		gormDB.Create(&db.Message{
+			Room:      "main",
+			Username:  "user1",
+			Text:      "msg",
+			Timestamp: time.Now().Add(time.Duration(i) * time.Second),
+			Type:      "public",
+		})
+	}
+
+	srv := setupWSServer(hub)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "?username=newuser&room=main"
+	wc := newWSClient(t, wsURL)
+	defer wc.close()
+
+	count := 0
+	for i := 0; i < 10; i++ {
+		msg, err := wc.recvMsg(2 * time.Second)
+		if err != nil {
+			break
+		}
+		if msg.Type == "public" {
+			count++
+		}
+	}
+	if count != 5 {
+		t.Errorf("history message count = %d, want 5", count)
+	}
+}
+
+func TestHub_MuteUser_UnmuteUser(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+	ctx := context.Background()
+
+	err := hub.MuteUser(ctx, "user1", 10*time.Minute)
+	if err != nil {
+		t.Fatalf("MuteUser error = %v", err)
+	}
+
+	exists, _ := mr.Exists(ctx, "muted:user1")
+	if exists != 1 {
+		t.Error("muted key not found after MuteUser")
+	}
+
+	err = hub.UnmuteUser(ctx, "user1")
+	if err != nil {
+		t.Fatalf("UnmuteUser error = %v", err)
+	}
+
+	exists, _ = mr.Exists(ctx, "muted:user1")
+	if exists != 0 {
+		t.Error("muted key still exists after UnmuteUser")
+	}
+}
+
+func TestHub_BanUser_UnbanUser(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+	ctx := context.Background()
+
+	err := hub.BanUser(ctx, "user1")
+	if err != nil {
+		t.Fatalf("BanUser error = %v", err)
+	}
+
+	exists, _ := mr.Exists(ctx, "banned:user1")
+	if exists != 1 {
+		t.Error("banned key not found after BanUser")
+	}
+
+	err = hub.UnbanUser(ctx, "user1")
+	if err != nil {
+		t.Fatalf("UnbanUser error = %v", err)
+	}
+
+	exists, _ = mr.Exists(ctx, "banned:user1")
+	if exists != 0 {
+		t.Error("banned key still exists after UnbanUser")
+	}
+}
+
+func TestHub_ScanPresence(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+	ctx := context.Background()
+
+	mr.Set(ctx, "presence:main:user1", "online", 0)
+	mr.Set(ctx, "presence:main:user2", "online", 0)
+	mr.Set(ctx, "presence:lobby:user3", "online", 0)
+
+	presences, err := hub.ScanPresence(ctx)
+	if err != nil {
+		t.Fatalf("ScanPresence error = %v", err)
+	}
+	if len(presences) != 3 {
+		t.Errorf("ScanPresence len = %d, want 3", len(presences))
+	}
+}
+
+func TestHub_SubscribeRoomMessages(t *testing.T) {
+	hub, _, mr := setupTestHub(t)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	go func() {
+		hub.SubscribeRoomMessages()
+	}()
+
+	payload, _ := json.Marshal(map[string]any{
+		"instance": "other-instance",
+		"msg": db.Message{
+			Room:      "main",
+			Username:  "remoteuser",
+			Text:      "remote hello",
+			Timestamp: time.Now(),
+			Type:      "public",
+		},
+	})
+	mr.Publish(ctx, "room:main:messages", string(payload))
+	time.Sleep(50 * time.Millisecond)
+
+	ownPayload, _ := json.Marshal(map[string]any{
+		"instance": "test-instance",
+		"msg": db.Message{
+			Room:      "main",
+			Username:  "localuser",
+			Text:      "local hello",
+			Timestamp: time.Now(),
+			Type:      "public",
+		},
+	})
+	mr.Publish(ctx, "room:main:messages", string(ownPayload))
+	time.Sleep(50 * time.Millisecond)
+}

backend/playout/src/go.mod

@@ -0,0 +1,27 @@
+module playout
+
+go 1.26.5
+
+require (
+	github.com/aws/aws-sdk-go-v2 v1.43.4
+	github.com/aws/aws-sdk-go-v2/config v1.32.35
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.107.0
+)
+
+require (
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.16 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.19.34 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.35 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.35 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.35 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.36 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.15 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.28 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.35 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.36 // indirect
+	github.com/aws/aws-sdk-go-v2/service/signin v1.5.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.33.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.38.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.45.4 // indirect
+	github.com/aws/smithy-go v1.27.6 // indirect
+)

backend/playout/src/go.sum

@@ -0,0 +1,36 @@
+github.com/aws/aws-sdk-go-v2 v1.43.4 h1:b9FTvbRwy+JCsfp2Wp6wV/KbOx3Aj7nkoFb2cRX0IhE=
+github.com/aws/aws-sdk-go-v2 v1.43.4/go.mod h1:70vwSy16txshwG+g55WkpgPKDIByzHI8ccBsOteo3bQ=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.16 h1:aiuaKlDweRC5qExJondpWjOgyzMHpofpwspGXUtwn4c=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.16/go.mod h1:nG/LOlmox9BDe9HvQnXWzgcK8uKbgBMZ/Hp5pVt/21I=
+github.com/aws/aws-sdk-go-v2/config v1.32.35 h1:UEzXuET8E42lxBPijuACu/tEK7v5lFPlk0Q+GT5WD9E=
+github.com/aws/aws-sdk-go-v2/config v1.32.35/go.mod h1:KaMtJpFa2JlL2BStjjHQVwQpzZEmw+ND/EgVrfFoo2g=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.34 h1:y6GkSmcv5myd1ngrYbGmiLlwQqB6TQhOuN/tbSSuWDY=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.34/go.mod h1:w3dTcnDVoQIewjo7JG45hduAToikiIFLC4FIO7fndvw=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.35 h1:+S7kbJoLDDQ5tE+lHrUBgMkzC8NLgsaioS2F3dVoFAE=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.35/go.mod h1:Ak7xXviIARfFdNUJ9Etb0bdVDt/KAvKjMGJVLWXDzik=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.35 h1:kzVuGlatQtYinwBJEEyLAbggepCoavosiaHHX9+fD+c=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.35/go.mod h1:0yLx0yEI+SfqeJMPvOtIEFoZbiQYXMGszBueiutQyaI=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.35 h1:WK6CjihTuLisCjSKKbildJ79sGZZgbBz3iNa7VsKIhU=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.35/go.mod h1:KYleN57luLoe97R7vTnx8PMcVrr9gAcRECtOjl91DNg=
+github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.36 h1:jbGY4CXLzZElOXgGsexlC3Hi+3YM0rSmk4opFXKqg/k=
+github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.36/go.mod h1:uBu/9aKsS/UQGc72RAt3y54kjgYQxmhut8ZD2dXCDNE=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.15 h1:JJLBQxwY+AFwuPAi5ivGc1ChnTdUt4cXMv7e76m2c/Y=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.15/go.mod h1:lQknBIe78MVL0cQOQDlag8KGflMbMEVFx9mB6O8ENvk=
+github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.28 h1:Q1TF1J9jVD+vFo0LzNnmNdQ9EAt52TS+MQlq9Ir+Yxo=
+github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.28/go.mod h1:4KqXXC/p1hrotmouDFbrRoWaLy962b9PMUReCG6+uWo=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.35 h1:BBEElKh4a+rKshvjrfpajTe9CbpZvrbb4Jkg2PB7RzA=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.35/go.mod h1:zaZk983w//8beSruBVec/mr4CmDwgZitW/qzGhAAX0g=
+github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.36 h1:EUIwBoN+q7UmhAejxgD27APiRjh1vwCFo53gSqdT0BM=
+github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.36/go.mod h1:6u00gmlTGR6W0b2k9NBrld7MnOEmf1Spqx0VVt6AqyE=
+github.com/aws/aws-sdk-go-v2/service/s3 v1.107.0 h1:OkYV+1171za+ab9otU1tGxMXhx6uZvwVEtVddjLuYTg=
+github.com/aws/aws-sdk-go-v2/service/s3 v1.107.0/go.mod h1:5FTZoQxhmLEiCAtYVk6V+t0iS/B5yGZVLZ3Wq5FDJZI=
+github.com/aws/aws-sdk-go-v2/service/signin v1.5.4 h1:cOJELVNrq5Q3Udry2GLuHUM7MhwpeaQRdYaoa6GI/yI=
+github.com/aws/aws-sdk-go-v2/service/signin v1.5.4/go.mod h1:f4LxzKBtaTxD7xh3PiVg3CE1tchQemfmghaJr+NbK2c=
+github.com/aws/aws-sdk-go-v2/service/sso v1.33.4 h1:AMW7a7S8iQaHjBYZdU3PCq4GKRPijTPRAc7e6XtEThY=
+github.com/aws/aws-sdk-go-v2/service/sso v1.33.4/go.mod h1:QQNsFV1DVXoXcZt18FS8lI8rtUrlDyAuWZLQ5shunv4=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.38.4 h1:AsbZcJAQPRmHDJG8K1N0pof/1zPWjVT8TFlTWuGLSvo=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.38.4/go.mod h1:6imqztH0//t0mKbl6yWl7swSEl7F/w32oAmqB3vP1ag=
+github.com/aws/aws-sdk-go-v2/service/sts v1.45.4 h1:w/AryDYMjSUANSQ2uoZxJovUsMTwWJNTv3IMex30Y+4=
+github.com/aws/aws-sdk-go-v2/service/sts v1.45.4/go.mod h1:WeBiAa67azG7Su9Vf+ChGDBLiAozJCXzdjXiPBUwtbc=
+github.com/aws/smithy-go v1.27.6 h1:0zjT8jgK3jbrTT7JJ3EE6JsMhX8JTrZ+f1sEndYDXrA=
+github.com/aws/smithy-go v1.27.6/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=

backend/playout/src/playlist_test.go

@@ -0,0 +1,353 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestLoadPlaylist(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	tests := []struct {
+		name     string
+		content  string
+		wantLen  int
+		wantErr  bool
+		first    string
+	}{
+		{
+			name:    "simple paths",
+			content: "/videos/video1.mp4\n/videos/video2.mp4\n",
+			wantLen: 2,
+			first:   "/videos/video1.mp4",
+		},
+		{
+			name:    "with file prefix",
+			content: "file /videos/video1.mp4\nfile '/videos/video2.mp4'\n",
+			wantLen: 2,
+			first:   "/videos/video1.mp4",
+		},
+		{
+			name:    "with file prefix double quotes",
+			content: "file \"/videos/video1.mp4\"\n",
+			wantLen: 1,
+			first:   "/videos/video1.mp4",
+		},
+		{
+			name:    "with comments and blanks",
+			content: "# comment\n\n/videos/video1.mp4\n\n# another\n/videos/video2.mp4\n",
+			wantLen: 2,
+			first:   "/videos/video1.mp4",
+		},
+		{
+			name:    "empty file",
+			content: "",
+			wantLen: 0,
+		},
+		{
+			name:    "only comments",
+			content: "# comment\n# another\n",
+			wantLen: 0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			path := filepath.Join(tmpDir, tt.name+".txt")
+			os.WriteFile(path, []byte(tt.content), 0644)
+
+			videos, err := LoadPlaylist(path)
+			if tt.wantErr && err == nil {
+				t.Error("expected error, got nil")
+			}
+			if !tt.wantErr && err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if len(videos) != tt.wantLen {
+				t.Errorf("len = %d, want %d", len(videos), tt.wantLen)
+			}
+			if tt.wantLen > 0 && videos[0].Path != tt.first {
+				t.Errorf("videos[0].Path = %q, want %q", videos[0].Path, tt.first)
+			}
+		})
+	}
+}
+
+func TestLoadPlaylist_FileNotFound(t *testing.T) {
+	_, err := LoadPlaylist("/nonexistent/playlist.txt")
+	if err == nil {
+		t.Error("expected error for missing file, got nil")
+	}
+}
+
+func TestValidateKeyframeInterval(t *testing.T) {
+	tests := []struct {
+		name     string
+		csvData  string
+		wantErr  bool
+		errText  string
+	}{
+		{
+			name:    "valid keyframes (gaps <=2s)",
+			csvData: "1,0.00\n0,0.50\n1,1.00\n0,1.50\n1,2.00\n0,2.50\n1,3.00\n",
+			wantErr: false,
+		},
+		{
+			name:    "gap too large >2s",
+			csvData: "1,0.00\n0,1.00\n1,3.50\n0,4.00\n1,6.00\n",
+			wantErr: true,
+			errText: "keyframe interval too large",
+		},
+		{
+			name:    "insufficient keyframes (<2)",
+			csvData: "1,0.00\n",
+			wantErr: true,
+			errText: "insufficient keyframes",
+		},
+		{
+			name:    "empty output",
+			csvData: "",
+			wantErr: true,
+			errText: "keyframe probe failed",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// create temp ffprobe that outputs csvData
+			tmpDir := t.TempDir()
+			mockProbe := filepath.Join(tmpDir, "ffprobe")
+			var script string
+			if tt.csvData == "" {
+				script = "@echo off\necho\nexit /b 1\n"
+			} else {
+				script = "@echo off\necho " + strings.ReplaceAll(tt.csvData, "\n", "& echo ") + "\nexit /b 0\n"
+			}
+			os.WriteFile(mockProbe+".bat", []byte(script), 0755)
+			os.Setenv("PATH", tmpDir+string(os.PathListSeparator)+os.Getenv("PATH"))
+			defer os.Unsetenv("PATH")
+
+			err := validateKeyframeInterval("test.mp4")
+			if tt.wantErr && err == nil {
+				t.Error("expected error, got nil")
+			}
+			if !tt.wantErr && err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if tt.wantErr && tt.errText != "" && err != nil {
+				if !strings.Contains(err.Error(), tt.errText) {
+					t.Errorf("error = %v, want containing %q", err, tt.errText)
+				}
+			}
+		})
+	}
+}
+
+func TestValidateVideoStrict(t *testing.T) {
+	// ValidateVideoStrict calls ValidateVideo which calls ffprobe
+	// Test only the result structure when ValidateVideo returns valid=false
+	// Mock not feasible without full ffprobe mock, skip for now
+	t.Skip("requires ffprobe mock or test media fixtures")
+}
+
+func TestHealthHandler(t *testing.T) {
+	// Save and restore globals
+	prevMode := playoutMode
+	prevCount := restartCount
+	playoutMode = "live"
+	restartCount = 3
+	defer func() {
+		playoutMode = prevMode
+		restartCount = prevCount
+	}()
+
+	req := httptest.NewRequest("GET", "/health", nil)
+	w := httptest.NewRecorder()
+	HealthHandler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+
+	body := w.Body.String()
+	if !strings.Contains(body, `"healthy"`) {
+		t.Errorf("body missing healthy: %s", body)
+	}
+	if !strings.Contains(body, `"playout"`) {
+		t.Errorf("body missing service: %s", body)
+	}
+	if !strings.Contains(body, `"restarts":3`) {
+		t.Errorf("body missing restarts: %s", body)
+	}
+}
+
+func TestHealthHandler_Degraded(t *testing.T) {
+	prevMode := playoutMode
+	playoutMode = "slate"
+	defer func() { playoutMode = prevMode }()
+
+	req := httptest.NewRequest("GET", "/health", nil)
+	w := httptest.NewRecorder()
+	HealthHandler(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("status = %d, want 200", w.Code)
+	}
+	body := w.Body.String()
+	if !strings.Contains(body, `"degraded"`) {
+		t.Errorf("body missing degraded: %s", body)
+	}
+}
+
+func TestShouldEscalateToSlate(t *testing.T) {
+	// Save globals
+	prevCount := restartCount
+	prevWindow := restartWindow
+	defer func() {
+		restartCount = prevCount
+		restartWindow = prevWindow
+	}()
+
+	// Under threshold
+	restartWindow = time.Now()
+	restartCount = 3
+	if shouldEscalateToSlate() {
+		t.Error("shouldEscalateToSlate() = true, want false (under threshold)")
+	}
+
+	// At threshold
+	restartCount = maxRestartsPerMinute
+	if !shouldEscalateToSlate() {
+		t.Error("shouldEscalateToSlate() = false, want true (at threshold)")
+	}
+
+	// Over threshold
+	restartCount = 7
+	if !shouldEscalateToSlate() {
+		t.Error("shouldEscalateToSlate() = false, want true (over threshold)")
+	}
+
+	// Window expired
+	restartWindow = time.Now().Add(-61 * time.Second)
+	restartCount = 10
+	if shouldEscalateToSlate() {
+		t.Error("shouldEscalateToSlate() = true, want false (window expired, should reset)")
+	}
+	if restartCount != 0 {
+		t.Errorf("restartCount after window reset = %d, want 0", restartCount)
+	}
+}
+
+func TestResetHLSOutput(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	// Create some segment files
+	os.MkdirAll(tmpDir, 0755)
+	os.WriteFile(filepath.Join(tmpDir, "segment_test.ts"), []byte("data"), 0644)
+	os.WriteFile(filepath.Join(tmpDir, "segment_test.m4s"), []byte("data"), 0644)
+	os.WriteFile(filepath.Join(tmpDir, "playlist.m3u8"), []byte("#EXTM3U"), 0644)
+	os.WriteFile(filepath.Join(tmpDir, "init.mp4"), []byte("init"), 0644)
+
+	err := resetHLSOutput(tmpDir)
+	if err != nil {
+		t.Fatalf("resetHLSOutput error: %v", err)
+	}
+
+	// Verify all cleaned
+	for _, name := range []string{"segment_test.ts", "segment_test.m4s", "playlist.m3u8", "init.mp4"} {
+		if _, err := os.Stat(filepath.Join(tmpDir, name)); !os.IsNotExist(err) {
+			t.Errorf("file %s still exists after reset", name)
+		}
+	}
+}
+
+func TestResetHLSOutput_EmptyDir(t *testing.T) {
+	tmpDir := t.TempDir()
+	err := resetHLSOutput(tmpDir)
+	if err != nil {
+		t.Fatalf("resetHLSOutput on empty dir error: %v", err)
+	}
+}
+
+func TestActivateSlate_NoSlate(t *testing.T) {
+	prevSlateDir := slateDir
+	prevHLSDir := hlsDir
+	prevMode := playoutMode
+	tmpDir := t.TempDir()
+	slateDir = filepath.Join(tmpDir, "slate")
+	hlsDir = filepath.Join(tmpDir, "hls")
+	os.MkdirAll(hlsDir, 0755)
+	defer func() {
+		slateDir = prevSlateDir
+		hlsDir = prevHLSDir
+		playoutMode = prevMode
+	}()
+
+	err := activateSlate()
+	if err == nil {
+		t.Error("expected error when slate HLS missing, got nil")
+	}
+}
+
+func TestActivateSlate_Success(t *testing.T) {
+	prevSlateDir := slateDir
+	prevHLSDir := hlsDir
+	prevMode := playoutMode
+	tmpDir := t.TempDir()
+	slateDir = filepath.Join(tmpDir, "slate")
+	hlsDir = filepath.Join(tmpDir, "hls")
+
+	// Create slate HLS structure
+	slateHLS := filepath.Join(slateDir, "hls")
+	os.MkdirAll(slateHLS, 0755)
+	os.MkdirAll(hlsDir, 0755)
+	os.WriteFile(filepath.Join(slateHLS, "slate.m3u8"), []byte("#EXTM3U\n#EXT-X-ENDLIST\n"), 0644)
+	os.WriteFile(filepath.Join(slateHLS, "slate_segment.ts"), []byte("slate-data"), 0644)
+
+	defer func() {
+		slateDir = prevSlateDir
+		hlsDir = prevHLSDir
+		playoutMode = prevMode
+	}()
+
+	err := activateSlate()
+	if err != nil {
+		t.Fatalf("activateSlate error: %v", err)
+	}
+
+	if playoutMode != "slate" {
+		t.Errorf("playoutMode = %q, want slate", playoutMode)
+	}
+
+	// Verify files copied
+	if _, err := os.Stat(filepath.Join(hlsDir, "slate.m3u8")); os.IsNotExist(err) {
+		t.Error("slate.m3u8 not copied to hls dir")
+	}
+}
+
+func TestDeactivateSlate(t *testing.T) {
+	prevMode := playoutMode
+	playoutMode = "slate"
+	defer func() { playoutMode = prevMode }()
+
+	deactivateSlate()
+
+	if playoutMode != "live" {
+		t.Errorf("playoutMode = %q, want live", playoutMode)
+	}
+}
+
+func TestValidatePlaylist(t *testing.T) {
+	// ValidatePlaylist calls ValidateVideo which needs ffprobe
+	t.Skip("requires ffprobe mock or test media fixtures")
+}
+
+func TestSyncToR2(t *testing.T) {
+	// Requires R2/S3 mock
+	t.Skip("requires S3 client mock")
+}

docker-compose.prod.yml

@@ -180,8 +180,7 @@ services:
       - "3001:3000"
     volumes:
       - grafana-data:/var/lib/grafana
-      - ./monitoring/grafana/dashboards:/etc/grafana/provisioning/dashboards
+      - grafana-provisioning:/etc/grafana/provisioning
-      - ./monitoring/grafana/datasources:/etc/grafana/provisioning/datasources
     environment:
       - GF_SECURITY_ADMIN_USER=admin
       - GF_SECURITY_ADMIN_PASSWORD=${GRAFANA_PASSWORD:-admin}
@@ -201,3 +200,4 @@ volumes:
   prometheus-config:
   prometheus-data:
   grafana-data:
+  grafana-provisioning:

docs/architecture/README.md

@@ -114,8 +114,8 @@ Full decision rationale, alternatives, and consequences in [`adr/ADR-001.md`](ad
 ### Quality Goals
 
 | Priority | Quality Attribute         | Goal                                                     | Scenario                                                                                    |
-| -------- | ------------------------- | -------------------------------------------------------- | -------------------------------------------------------------------------------- |
+| -------- | ------------------------- | -------------------------------------------------------- | ------------------------------------------------------------------------------------------- |
-| 1        | **Cost Efficiency**       | <$25/month for moderate scale (100s concurrent)          | R2 $0 egress + immutable `.ts` edge caching eliminates per-viewer bandwidth cost |
+| 1        | **Cost Efficiency**       | <$25/month for moderate scale (100s concurrent)          | R2 $0 egress + immutable `.m4s` and `.ts` edge caching eliminates per-viewer bandwidth cost |
 | 2        | **Performance / Latency** | Low US latency; acceptable HLS delay                     | Hetzner Ashburn origin + Cloudflare US POPs (15–35s end-to-end)                             |
 | 3        | **Availability**          | 24/7 with minimal downtime                               | FFmpeg/MediaMTX auto-restart loop, fallback slate, monitoring                               |
 | 4        | **Scalability**           | Grow from 10s to 1000s viewers without proportional cost | Edge caching + R2; only request volume limits                                               |
@@ -186,7 +186,7 @@ flowchart TD
 
 **External Interfaces**:
 
-- **Cloudflare**: CDN (cache rules for `.ts` vs `.m3u8`), R2 (object storage, $0 egress), Pages (static hosting), WAF/TLS.
+- **Cloudflare**: CDN (cache rules for `.m4s` and `.ts` vs `.m3u8`), R2 (object storage, $0 egress), Pages (static hosting), WAF/TLS.
 - **Hetzner VPS**: Compute for playout and chat (low-cost US-East with good peering).
 - **Browsers**: Native HLS (`<video>` + hls.js) and WebSocket APIs.
 - **Source**: Pre-normalized MP4 files uploaded to R2.
@@ -196,7 +196,7 @@ This diagram synthesizes the context views from all original ADRs. Full decision
 ### Technical Context
 
 - **Playout**: FFmpeg consuming normalized playlist → continuous HLS.
-- **Packaging/Delivery**: MediaMTX/SRS/Nginx → immutable `.ts` segments to R2; Cloudflare edge cache.
+- **Packaging/Delivery**: MediaMTX/SRS/Nginx → immutable `.m4s` and `.ts` segments to R2; Cloudflare edge cache.
 - **Frontend**: Static SPA with hls.js.
 - **Chat**: Lightweight WebSocket service (Node/Go) + Redis (presence/rate limits) + PostgreSQL/SQLite (history/moderation).
 - **Normalization**: All source videos must be H.264/AAC, 30 fps constant, 2s keyframes.
@@ -212,7 +212,7 @@ This diagram synthesizes the context views from all original ADRs. Full decision
 
 1. **US-East Playout on Hetzner Ashburn VPS** (`CX22` or equivalent): FFmpeg + MediaMTX/SRS for continuous playlist-to-HLS conversion (`-c copy` where possible).
 2. **Immutable HLS to Cloudflare R2**: Segments use unique names; R2 acts as origin with $0 egress.
-3. **Aggressive Edge Caching**: Long TTL for `.ts` (immutable), short TTL (1–10s) for live `.m3u8`. Tiered Cache enabled. This makes viewer delivery essentially free.
+3. **Aggressive Edge Caching**: Long TTL for `.m4s` and `.ts` (immutable), short TTL (1–10s) for live `.m3u8`. Tiered Cache enabled. This makes viewer delivery essentially free.
 4. **Lightweight Custom Frontend**: Static HTML/JS SPA + hls.js player + embedded chat sidebar.
 5. **Separate but co-located Chat Service**: WebSockets with persistence and moderation (low bandwidth).
 6. **Normalization & Monitoring**: Pre-process all videos; use dashboards + alerts for playout health, cache hit ratio, R2 ops.
@@ -230,7 +230,7 @@ Overview (Mermaid diagram):
 ```mermaid
 graph TD
     subgraph Cloudflare
-        CDN[CDN + Cache Rules<br/>.ts immutable long TTL<br/>.m3u8 short TTL]
+        CDN[CDN + Cache Rules<br/>.m4s and .ts immutable long TTL<br/>.m3u8 short TTL]
         R2[R2 - HLS + Source]
         Pages[Pages - Static SPA]
     end
@@ -306,7 +306,7 @@ graph TB
 
 - **Role**: Continuous HLS encoding loop using FFmpeg concat demuxer
 - **Input**: `data/playlist/playlist.txt` — ordered list of MP4 file paths
-- **Output**: HLS segments (`.ts`) + live manifest (`.m3u8`) written to `data/hls/`, mirrored to R2
+- **Output**: HLS segments (`.m4s` and `.ts`) + live manifest (`.m3u8`) written to `data/hls/`, mirrored to R2
 - **Resilience**: Restart counter (>5/60s → activate slate), Prometheus metrics on port 8081
 - **Validation**: ffprobe gate on all ingested files (codec, fps, resolution, keyframe interval)
 
@@ -383,7 +383,7 @@ Module-level breakdown per service.
 2. Playout worker (FFmpeg loop with concat demuxer) reads next file, packages as HLS segments (4-6s).
 3. Segments uploaded to R2 with unique immutable names; live `.m3u8` updated.
 4. Viewer loads SPA → requests master/live manifest → hls.js player follows current edge.
-5. Cloudflare serves `.ts` from nearest edge cache (origin/R2 hit only once per POP/region).
+5. Cloudflare serves `.m4s` and `.ts` from nearest edge cache (origin/R2 hit only once per POP/region).
 6. Parallel WebSocket connection to chat service for synchronized interaction.
 
 Notable aspects: Manifest freshness ensures all viewers stay on same timeline; cache hit ratio directly impacts cost and latency. Fallback slate activates on playout failure. Full cache policy, example configs (FFmpeg bash loop, Nginx RTMP HLS), and storage tables in `adr/ADR-001.md`.
@@ -394,7 +394,7 @@ Notable aspects: Manifest freshness ensures all viewers stay on same timeline; c
 
 ### CI/CD Pipeline Architecture
 
-The deployment follows a two-stage pipeline: **CI builds and pushes images**, then **CD pulls and deploys** them. Currently targeting the **test lab** (192.168.88.40). Production Hetzner VPS is planned but not yet provisioned — the same pipeline will deploy there by changing `DOCKER_HOST`.
+The deployment uses parallel workflows on each push to `main`: **CI builds and pushes images** while **CD deploys latest images** to the test lab. A dedicated release workflow handles semantic version tags. Current runtime target is the **test lab** (192.168.88.40). Production Hetzner VPS is planned but not yet provisioned — the same pipeline will deploy there by changing `DOCKER_HOST`.
 
 ```mermaid
 flowchart LR
@@ -431,18 +431,22 @@ flowchart LR
 **Pipeline Sequence:**
 
 1. **CI Workflow** (`.gitea/workflows/ci.yml`):
-   - Triggers on `push` to `main` or `pull_request`
+   - Triggers on `push` to `main` and `pull_request`
-   - Runs `test` job: frontend lint/build, Go validation, `docker compose build`
+   - Runs `test` job: frontend lint/build and Go validation
    - Runs `docker` job (after `test` passes, only on `main` push):
      - Builds `playout`, `chat`, `nginx` images with Buildx
      - Pushes to Gitea Container Registry with `main` and `latest` tags
 2. **CD Workflow** (`.gitea/workflows/cd.yml`):
-   - Triggers on `workflow_run` when CI completes successfully, or manually via `workflow_dispatch`
+   - Triggers on `push` to `main` (parallel to CI), or manually via `workflow_dispatch`
-   - Pulls latest images from registry
+   - Logs in remote Docker host to private registry
    - Generates `.env` from secrets
-   - Seeds Prometheus config into named volume
+   - Seeds Prometheus and Grafana provisioning into named volumes
-   - Deploys via `docker compose -f docker-compose.prod.yml up -d` to remote host (`192.168.88.40:2375` — test lab; switch to Hetzner IP for production)
+   - Deploys via `docker compose -f docker-compose.prod.yml up -d --remove-orphans --force-recreate` to remote host (`192.168.88.40:2375` — test lab; switch to Hetzner IP for production)
    - Runs health checks with retry logic for playout initialization
+3. **Release Workflow** (`.gitea/workflows/release.yml`):
+   - Triggers on semantic tags in `*.*.*` format (for example `1.0.9`)
+   - Builds and pushes versioned image tags (`X.Y.Z`, `X.Y`, `latest`)
+   - Creates release entry in Gitea
 
 ### Infrastructure Level 1
 
@@ -465,7 +469,7 @@ flowchart LR
 **Cloudflare Layer**:
 
 - R2 bucket for media.
-- Cache Rules (`.ts`: Cache Everything, immutable, long TTL; `.m3u8`: short TTL/must-revalidate).
+- Cache Rules (`.m4s` and `.ts`: Cache Everything, immutable, long TTL; `.m3u8`: short TTL/must-revalidate).
 - WAF, rate limiting, Tiered Cache.
 - Pages for SPA hosting.
 
@@ -475,7 +479,7 @@ Future evolution: Docker Compose, managed DB, secondary regions (detailed in sub
 
 ### Caching & Cost Optimization
 
-Immutable segment naming + targeted Cloudflare Cache Rules + R2 ($0 egress) = near-zero viewer bandwidth cost. Long TTL on `.ts`, short on live manifests. Monitor hit ratio and R2 Class B ops.
+Immutable segment naming + targeted Cloudflare Cache Rules + R2 ($0 egress) = near-zero viewer bandwidth cost. Long TTL on `.m4s` and `.ts`, short on live manifests. Monitor hit ratio and R2 Class B ops.
 
 ### Video Normalization & Playout
 
@@ -524,14 +528,14 @@ Linear Void uses a two-layer monitoring model:
 
 - Config file: `monitoring/prometheus/prometheus.yml`
 - Default scrape interval: `15s`
-- Current scrape jobs: `chat` -> `chat:3000`, `prometheus` -> `prometheus:9090`.
+- Current scrape jobs (7 total):
-
+  - `chat` -> `chat:3000`
-Recommended next-step scrape targets (if/when exporters are introduced):
+  - `playout` -> `playout:8081`
-
+  - `nginx` -> `nginx-exporter:9113`
-- `nginx` (via nginx-exporter)
+  - `redis` -> `redis-exporter:9121`
-- `redis` (via redis-exporter)
+  - `postgres` -> `postgres-exporter:9187`
-- `postgres` (via postgres-exporter)
+  - `node` -> `node-exporter:9100`
-- `node` (via node-exporter)
+  - `prometheus` -> `localhost:9090`
 
 #### Grafana Dashboards
 
@@ -542,22 +546,20 @@ Use the app dashboard for service-level behavior and the Prometheus overview das
 
 #### Alerting Rules (Prometheus Rule Groups)
 
-Define alert rules as grouped policies (for example in `monitoring/prometheus/alerts.yml`) and include them from `prometheus.yml`.
+Rules are implemented in `monitoring/prometheus/alerts.yml` and loaded via `rule_files` from `prometheus.yml`.
 
-Minimum recommended alert set:
+Current rule set (8):
 
-- **Availability**
+- `ChatDown`
-  `up{job="chat"} == 0` for `2m`; `up{job="prometheus"} == 0` for `2m`.
+- `PlayoutDown`
-- **Chat service health**
+- `RedisDown`
-  `linearvoid_chat_redis_up == 0` for `2m`; sudden disconnect spike / connected clients collapse.
+- `PlayoutSlateActive`
-- **Playout continuity**
+- `HighChatLatency`
-  No HLS segment progression for `30-60s` (from playout-specific metric when available).
+- `PrometheusWALFailing`
-- **Prometheus capacity and ingestion health**
+- `HighCPU`
-  Sustained growth in `prometheus_tsdb_wal_writes_failed_total` or `prometheus_tsdb_compactions_failed_total`, abnormal jump in `prometheus_tsdb_out_of_order_samples_total`, and high `prometheus_engine_queries` near concurrent limit.
+- `LowDiskSpace`
-- **Latency and user-impact**
-  Elevated p99 handler latency from `prometheus_http_request_duration_seconds_bucket` and elevated p99 query execution latency from `prometheus_engine_query_duration_histogram_seconds_bucket`.
 
-Route warning/critical severities to the team channel and keep runbook links attached to each alert definition.
+Route warning/critical severities to the operations channel and keep runbook links attached to each alert definition.
 
 Operational resilience baseline:
 
@@ -887,8 +889,8 @@ Document and rehearse this runbook quarterly; recovery that is not exercised is
 ## Glossary
 
 | Term              | Definition                                                                             |
-| ----------------- | ------------------------------------------------------------------------------------------ |
+| ----------------- | -------------------------------------------------------------------------------------- |
-| HLS               | HTTP Live Streaming – protocol using `.m3u8` manifests and media segments (`.ts` or fMP4). |
+| HLS               | HTTP Live Streaming – protocol using `.m3u8` manifests and media segments (fMP4).      |
 | Immutable Segment | HLS chunk with unique, unchanging name enabling long-lived caching.                    |
 | R2                | Cloudflare object storage ($0 egress, ideal origin for cached HLS).                    |
 | Edge Cache / POP  | Cloudflare points-of-presence that cache and serve content close to viewers.           |

docs/architecture/adr/ADR-001.md

@@ -19,11 +19,11 @@ We require a completely independent 24/7 linear video channel that broadcasts a
 **Key distinctions**:
 
 - **Playout**: Continuous scheduled program from playlist.
-- **Packaging**: FFmpeg → standard HLS (`.m3u8` + `.ts` segments, 4–6s duration).
+- **Packaging**: FFmpeg → standard HLS (`.m3u8` + `.m4s` segments, 4–6s duration).
 - **Delivery**: Immutable segments served via Cloudflare edge caching + R2 (zero egress cost).
 - **Interaction**: Separate lightweight WebSocket service for chat.
 
-Bandwidth (not storage or compute) is the dominant cost driver. A single viewer at ~4 Mbps consumes ~1.3–1.8 TB/month; 100 concurrent viewers = ~130–180 TB/month. Direct VPS delivery is only viable for PoC/small audiences.
+Bandwidth (not storage or compute) is the dominant cost driver. A single viewer at ~4 Mbps consumes ~1.3–1.8 TB/month; 100 concurrent viewers = ~130–180 TB/month. Direct VPS delivery is only viable for PoC/small audiences. HLS segments are typically `.m4s` files, with `.m4s` being the default for fMP4 segments.
 
 ## Decision Drivers
 
@@ -31,7 +31,7 @@ Bandwidth (not storage or compute) is the dominant cost driver. A single viewer
 2. Full independence and ownership (no video platform lock-in).
 3. Strong US performance and low latency.
 4. True/near-true synchronization via live-style HLS (not pure VOD).
-5. Aggressive immutable caching of `.ts` segments to achieve near-zero egress.
+5. Aggressive immutable caching of `.m4s` segments to achieve near-zero egress.
 6. Browser-native playback (`hls.js` + native HLS).
 7. Lightweight, maintainable stack with modest operational complexity.
 8. Support for custom multi-room + private chat with persistence and moderation.
@@ -58,9 +58,9 @@ Adopt a **self-managed US-East playout + Cloudflare R2 + edge-cached HLS** archi
 
 ### 2. Storage & Delivery (Cloudflare R2 + CDN)
 
-- HLS segments (`.ts`) and manifests uploaded to **Cloudflare R2** (Eastern North America hint `enam`).
+- HLS segments (`.m4s`) and manifests uploaded to **Cloudflare R2** (Eastern North America hint `enam`).
-- Custom domain (`media.example.com`) fronted by Cloudflare with **Cache Rules**:
+- Custom domain (`media.linearvoid.tv`) fronted by Cloudflare with **Cache Rules**:
-  - `*.ts` (and init `.mp4` if using fMP4 later): `Cache Everything`, immutable, Edge TTL 24h–1yr (`Cache-Control: public, max-age=31536000, immutable`).
+  - `*.m4s` (and init `.mp4` if using fMP4 later): `Cache Everything`, immutable, Edge TTL 24h–1yr (`Cache-Control: public, max-age=31536000, immutable`).
   - `*.m3u8`: Short TTL (1–10s) or `must-revalidate` (`Cache-Control: public, max-age=1..10, must-revalidate`).
   - Master playlist: TTL ~30s.
   - Tiered Cache enabled where possible.
@@ -90,7 +90,7 @@ Adopt a **self-managed US-East playout + Cloudflare R2 + edge-cached HLS** archi
 
 **Initial Targets**:
 
-- Protocol: Standard HLS (`.ts` segments). Defer LL-HLS/CMAF/WebRTC.
+- Protocol: Standard HLS (`.m4s` segments). Defer LL-HLS/CMAF/WebRTC.
 - Max rendition: 720p30 initially (upgrade to 1080p30 or ABR later).
 - Latency: 15–35s (acceptable for linear programming/chat).
 

docs/architecture/adr/ADR-003-tech-stack.md

@@ -38,7 +38,7 @@ We must explicitly document language/runtime choices per module and the assumpti
 
 1. All video assets **must** be normalized before being added to any playlist (H.264, AAC, 30 fps constant, 2s keyframes, CRF encoding).
 2. Deployment is **Docker-first**; services will be containerized.
-3. Cloudflare is the primary CDN and will be configured with specific Cache Rules (`.ts` immutable long TTL, `.m3u8` short TTL).
+3. Cloudflare is the primary CDN and will be configured with specific [Cache Rules](../../../infrastructure/cloudflare/cache-rules.md).
 4. Chat does **not** require end-to-end encryption in v1 (separate ADR if needed).
 5. Single VPS origin initially; multi-region is a later evolution.
 6. Monitoring focuses on playout health, cache hit ratio, and R2 operation counts.

docs/architecture/templates/arc42-template-EN.md

@@ -26,10 +26,10 @@ contributors. See <https://arc42.org>.
 +-------------+---------------------------+---------------------------+
 | Role/Name | Contact | Expectations |
 +=============+===========================+===========================+
-| *           | *\<Contact-1\>*           | *\<Expectation-1\>*       |
+| * | _\<Contact-1\>_ | _\<Expectation-1\>_ |
 | \<Role-1\>* | | |
 +-------------+---------------------------+---------------------------+
-| *           | *\<Contact-2\>*           | *\<Expectation-2\>*       |
+| * | _\<Contact-2\>_ | _\<Expectation-2\>_ |
 | \<Role-2\>* | | |
 +-------------+---------------------------+---------------------------+
 
@@ -57,41 +57,41 @@ contributors. See <https://arc42.org>.
 
 ## Whitebox Overall System {#_whitebox_overall_system}
 
-***\<Overview Diagram\>***
+_**\<Overview Diagram\>**_
 
 Motivation
 
-:   *\<text explanation\>*
+: _\<text explanation\>_
 
 Contained Building Blocks
 
-:   *\<Description of contained building block (black boxes)\>*
+: _\<Description of contained building block (black boxes)\>_
 
 Important Interfaces
 
-:   *\<Description of important interfaces\>*
+: _\<Description of important interfaces\>_
 
 ### \<Name black box 1\> {#_name_black_box_1}
 
-*\<Purpose/Responsibility\>*
+_\<Purpose/Responsibility\>_
 
-*\<Interface(s)\>*
+_\<Interface(s)\>_
 
-*\<(Optional) Quality/Performance Characteristics\>*
+_\<(Optional) Quality/Performance Characteristics\>_
 
-*\<(Optional) Directory/File Location\>*
+_\<(Optional) Directory/File Location\>_
 
-*\<(Optional) Fulfilled Requirements\>*
+_\<(Optional) Fulfilled Requirements\>_
 
-*\<(optional) Open Issues/Problems/Risks\>*
+_\<(optional) Open Issues/Problems/Risks\>_
 
 ### \<Name black box 2\> {#_name_black_box_2}
 
-*\<black box template\>*
+_\<black box template\>_
 
 ### \<Name black box n\> {#_name_black_box_n}
 
-*\<black box template\>*
+_\<black box template\>_
 
 ### \<Name interface 1\> {#_name_interface_1}
 
@@ -101,42 +101,42 @@ Important Interfaces
 
 ## Level 2 {#_level_2}
 
-### White Box *\<building block 1\>* {#_white_box_building_block_1}
+### White Box _\<building block 1\>_ {#_white_box_building_block_1}
 
-*\<white box template\>*
+_\<white box template\>_
 
-### White Box *\<building block 2\>* {#_white_box_building_block_2}
+### White Box _\<building block 2\>_ {#_white_box_building_block_2}
 
-*\<white box template\>*
+_\<white box template\>_
 
 ...​
 
-### White Box *\<building block m\>* {#_white_box_building_block_m}
+### White Box _\<building block m\>_ {#_white_box_building_block_m}
 
-*\<white box template\>*
+_\<white box template\>_
 
 ## Level 3 {#_level_3}
 
 ### White Box \<\_building block x.1\_\> {#_white_box_building_block_x_1}
 
-*\<white box template\>*
+_\<white box template\>_
 
 ### White Box \<\_building block x.2\_\> {#_white_box_building_block_x_2}
 
-*\<white box template\>*
+_\<white box template\>_
 
 ### White Box \<\_building block y.1\_\> {#_white_box_building_block_y_1}
 
-*\<white box template\>*
+_\<white box template\>_
 
 # Runtime View {#section-runtime-view}
 
 ## \<Runtime Scenario 1\> {#_runtime_scenario_1}
 
--   *\<insert runtime diagram or textual description of the scenario\>*
+- _\<insert runtime diagram or textual description of the scenario\>_
 
--   *\<insert description of the notable aspects of the interactions
+- _\<insert description of the notable aspects of the interactions
-    between the building block instances depicted in this diagram.\>*
+  between the building block instances depicted in this diagram.\>_
 
 ## \<Runtime Scenario 2\> {#_runtime_scenario_2}
 
@@ -148,51 +148,51 @@ Important Interfaces
 
 ## Infrastructure Level 1 {#_infrastructure_level_1}
 
-***\<Overview Diagram\>***
+_**\<Overview Diagram\>**_
 
 Motivation
 
-:   *\<explanation in text form\>*
+: _\<explanation in text form\>_
 
 Quality and/or Performance Features
 
-:   *\<explanation in text form\>*
+: _\<explanation in text form\>_
 
 Mapping of Building Blocks to Infrastructure
 
-:   *\<description of the mapping\>*
+: _\<description of the mapping\>_
 
 ## Infrastructure Level 2 {#_infrastructure_level_2}
 
-### *\<Infrastructure Element 1\>* {#_infrastructure_element_1}
+### _\<Infrastructure Element 1\>_ {#_infrastructure_element_1}
 
-*\<diagram + explanation\>*
+_\<diagram + explanation\>_
 
-### *\<Infrastructure Element 2\>* {#_infrastructure_element_2}
+### _\<Infrastructure Element 2\>_ {#_infrastructure_element_2}
 
-*\<diagram + explanation\>*
+_\<diagram + explanation\>_
 
 ...​
 
-### *\<Infrastructure Element n\>* {#_infrastructure_element_n}
+### _\<Infrastructure Element n\>_ {#_infrastructure_element_n}
 
-*\<diagram + explanation\>*
+_\<diagram + explanation\>_
 
 # Cross-cutting Concepts {#section-concepts}
 
-## *\<Concept 1\>* {#_concept_1}
+## _\<Concept 1\>_ {#_concept_1}
 
-*\<explanation\>*
+_\<explanation\>_
 
-## *\<Concept 2\>* {#_concept_2}
+## _\<Concept 2\>_ {#_concept_2}
 
-*\<explanation\>*
+_\<explanation\>_
 
 ...​
 
-## *\<Concept n\>* {#_concept_n}
+## _\<Concept n\>_ {#_concept_n}
 
-*\<explanation\>*
+_\<explanation\>_
 
 # Architecture Decisions {#section-design-decisions}
 
@@ -209,7 +209,7 @@ Mapping of Building Blocks to Infrastructure
 +----------------------+-----------------------------------------------+
 | Term | Definition |
 +======================+===============================================+
-| *\<Term-1\>*         | *\<definition-1\>*                            |
+| _\<Term-1\>_ | _\<definition-1\>_ |
 +----------------------+-----------------------------------------------+
-| *\<Term-2\>*         | *\<definition-2\>*                            |
+| _\<Term-2\>_ | _\<definition-2\>_ |
 +----------------------+-----------------------------------------------+

docs/incident-runbook.md

@@ -161,4 +161,69 @@ docker exec linearvoid-db psql -U linearvoid -c "SELECT count(*) FROM messages;"
 3. Add prevention to docs if actionable
 4. Update this runbook if new failure mode discovered
 
-**Recovery targets:** RPO ≤24h, RTO ≤60min. Quarterly DR drill: simulate host loss, restore from backup.
+## Quarterly Disaster Recovery Drill
+
+Goal: validate recovery targets under controlled host-loss simulation.
+
+**Recovery targets:** RPO <= 24h, RTO <= 60min.
+
+### Prerequisites
+
+- Latest backup artifacts available from `scripts/backup-db.sh` and `scripts/backup-weekly.sh`
+- Operator access to Docker host and DNS controls
+- Current deployment variables available (`.env`, compose file, image tags)
+
+### Drill Scope
+
+- Simulate complete origin loss (all app containers unavailable)
+- Rebuild stack on clean host
+- Restore DB and media/playlist mounts
+- Verify viewer playback, chat, admin auth, monitoring targets
+
+### Drill Steps
+
+1. Record drill start timestamp and on-call participants.
+2. Capture pre-drill baseline:
+   - `curl -fsS http://<origin>/health`
+   - `curl -fsS http://<origin>:3000/health`
+   - `curl -fsS http://<origin>:8081/health`
+3. Simulate origin outage:
+   - `docker compose -f docker-compose.prod.yml down`
+4. Provision clean recovery host (or clean test-lab VM) and copy deployment bundle.
+5. Restore required data paths:
+   - `data/playlist/`
+   - `data/media/`
+   - `data/chat/`
+   - `data/hls/` (optional warm cache)
+6. Restore database from latest backup dump.
+7. Start stack:
+   - `docker compose -f docker-compose.prod.yml up -d`
+8. Validate service health and runtime:
+   - `docker ps --format "table {{.Names}}\t{{.Status}}"`
+   - `curl -fsS http://<origin>/health`
+   - `curl -fsS http://<origin>/hls/playlist.m3u8 | head -n 5`
+   - `curl -fsS http://<origin>:9090/-/ready`
+9. Validate app behavior:
+   - Viewer SPA loads and HLS plays
+   - WebSocket chat connects and message round-trip works
+   - Admin login/session endpoint returns success
+10. Run backup integrity check:
+    - `scripts/verify-backups.sh`
+11. Record drill end timestamp and compute measured RTO/RPO.
+
+### Pass/Fail Criteria
+
+- Pass if all core services healthy and functional in <= 60 minutes.
+- Pass if latest recoverable data point is <= 24 hours old.
+- Fail if any critical path remains degraded (playout, chat, admin auth, monitoring).
+
+### Evidence Template
+
+Document each drill in incident tracker with:
+
+- Date/time window
+- Environment (test-lab, staging, production)
+- Backup artifact IDs and timestamps
+- Measured RTO and RPO
+- Issues found and remediation owner
+- Follow-up ticket links

docs/operations/cloudflare-uptimerobot-checklist.md

@@ -0,0 +1,117 @@
+# Cloudflare and UptimeRobot Manual Completion Checklist
+
+Purpose: execute and record all manual dashboard tasks that cannot be automated from repository workflows.
+
+## Status Legend
+
+- [ ] Pending
+- [x] Done
+
+## 1) Cloudflare Pages Link and Build
+
+- [ ] Connect repo to Cloudflare Pages project
+- [ ] Build command set to: `cd frontend && npm run build`
+- [ ] Output directory set to: `frontend/dist`
+- [ ] Production domain attached to `linearvoid.tv`
+
+Evidence to capture:
+
+- Screenshot of Pages deployment settings
+- Deployment URL and latest deployment timestamp
+
+## 2) Tiered Cache Enablement and Validation
+
+- [ ] Smart Tiered Cache enabled for zone
+- [ ] Warm request made to hot HLS segment
+- [ ] Warm request made to live manifest
+- [ ] `Cf-Cache-Status: HIT` observed on repeated requests
+
+Validation commands:
+
+```bash
+curl -I https://media.linearvoid.tv/hls/playlist.m3u8
+curl -I https://media.linearvoid.tv/hls/<segment>.m4s
+```
+
+Evidence to capture:
+
+- Headers from first request (expected MISS)
+- Headers from repeated request (expected HIT)
+
+## 3) WAF and Bot Protection
+
+- [ ] OWASP Managed Ruleset enabled
+- [ ] Mode set to Simulate
+- [ ] Simulate mode reviewed for 48h
+- [ ] Mode switched to Block after false-positive review
+- [ ] Bot Fight Mode enabled
+
+Evidence to capture:
+
+- WAF ruleset status screenshot
+- Count of blocked/challenged events after cutover
+
+## 4) Rate Limiting Rules
+
+- [ ] Rule created for `/api/admin/login`
+- [ ] Rule created for `/api/admin/*`
+- [ ] Threshold set to `10 requests / 10 seconds / IP`
+- [ ] Action set to Managed Challenge
+- [ ] Rule order validated
+
+Validation approach:
+
+- Use burst requests from a test client and verify challenge behavior without blocking legitimate admin flow.
+
+Evidence to capture:
+
+- Rule definitions screenshot
+- Test result notes (challenge seen / no lockout)
+
+## 5) HTTPS and WSS Hardening
+
+- [ ] Always Use HTTPS enabled
+- [ ] HSTS enabled with max-age 31536000
+- [ ] HSTS includeSubDomains enabled
+- [ ] HSTS preload enabled
+- [ ] Minimum TLS version set to 1.2+
+- [ ] SSL mode verified as Full (strict)
+- [ ] WSS endpoint validated through proxy (`wss://linearvoid.tv/ws`)
+
+Validation commands:
+
+```bash
+curl -I https://linearvoid.tv
+curl -I https://linearvoid.tv/health
+```
+
+Evidence to capture:
+
+- Response headers showing HSTS
+- Successful browser WebSocket connect in devtools
+
+## 6) UptimeRobot Monitors
+
+- [ ] HTTP monitor added for `https://linearvoid.tv/health` (5m)
+- [ ] Keyword monitor added for `https://linearvoid.tv/hls/playlist.m3u8` (keyword `#EXTM3U`, 5m)
+- [ ] Alert trigger set to 2 consecutive failures
+- [ ] Notification channels configured (email + Discord/Slack webhook)
+
+Evidence to capture:
+
+- Monitor dashboard screenshot
+- Test alert delivery confirmation
+
+## 7) Sign-Off
+
+- [ ] Cloudflare manual tasks complete
+- [ ] UptimeRobot tasks complete
+- [ ] TODO items updated to done
+- [ ] Changelog entry added for completion batch
+
+Sign-off fields:
+
+- Owner:
+- Date:
+- Environment (test-lab or production):
+- Notes:

docs/operations/scaling-performance-playbook.md

@@ -0,0 +1,203 @@
+# Scaling and Performance Playbook
+
+Purpose: define repeatable method to measure performance, capture baseline data, and decide scaling actions.
+
+Scope: planning and execution guide for TODO items under "Scaling & Performance (planning only)".
+
+## 1) Manifest TTL Tuning Plan
+
+Goal: tune `.m3u8` TTL to about `0.5x` segment duration while keeping playback stable.
+
+Inputs:
+
+- Segment duration (`HLS_SEGMENT_DURATION`)
+- Current manifest TTL (Cloudflare cache rule)
+- Cache outcome distribution (`Cf-Cache-Status`)
+
+Procedure:
+
+1. Start from current manifest TTL (2s).
+2. Capture 24h baseline headers from repeated `playlist.m3u8` requests.
+3. Test candidate TTLs: 1s, 2s, 3s.
+4. Compare:
+   - rebuffer events from player logs
+   - origin request increase/decrease
+   - HIT ratio changes
+5. Select lowest TTL that keeps playback stable and origin load acceptable.
+
+Acceptance:
+
+- No material increase in rebuffer rate.
+- Manifest staleness not observable by users.
+
+## 2) TTFB Baseline Plan
+
+Goal: measure warm-cache TTFB from 3+ US regions with target `< 4s`.
+
+Suggested regions:
+
+- US East (Virginia)
+- US Central
+- US West (California/Oregon)
+
+Method:
+
+1. Use WebPageTest with repeat view enabled.
+2. Run at least 5 samples per region.
+3. Record median and p95 TTFB.
+4. Store results in table (date, region, median, p95, test URL).
+
+Acceptance:
+
+- Warm-cache median < 4s in all tested regions.
+- Outliers documented with likely cause.
+
+## 3) WebSocket Load-Test Plan
+
+Goal: characterize chat service behavior across 10 -> 100 -> 500 -> 1000 concurrent clients.
+
+Tooling option A (Artillery):
+
+```bash
+npx artillery run scripts/loadtest/ws-chat.yml
+```
+
+Tooling option B (custom Go harness):
+
+- open N concurrent WebSocket clients
+- send message every X seconds
+- measure round-trip latency and failures
+
+Metrics to capture:
+
+- p50/p95 message latency
+- error rate (connect, send, receive)
+- dropped connections
+- CPU/memory for `chat`, `redis`, `nginx`
+
+Acceptance:
+
+- p95 chat latency <= 1s at target concurrency tier.
+- error rate <= 1% during steady state.
+
+## 4) Admin API Benchmark Plan
+
+Goal: measure admin API p95 and identify slow endpoints.
+
+Tooling option A (`k6`):
+
+```bash
+k6 run scripts/loadtest/admin-api.js
+```
+
+Tooling option B (`wrk`):
+
+```bash
+wrk -t4 -c100 -d60s http://<host>/api/admin/overview
+```
+
+Endpoints:
+
+- `/api/admin/overview`
+- `/api/admin/analytics`
+- `/api/admin/chat-log`
+- `/api/admin/users`
+
+Acceptance:
+
+- p95 < 1s for primary admin endpoints.
+- slow endpoint list with remediation notes.
+
+## 5) Cache Hit Ratio Tracking Plan
+
+Goal: track Cloudflare cache hit ratio and alert when below threshold.
+
+Implementation outline:
+
+1. Pull Cloudflare GraphQL analytics on schedule.
+2. Export to Prometheus-compatible metric path.
+3. Add Grafana panel with 5m/1h/24h windows.
+4. Alert when hit ratio < 90% for 15m.
+
+Metric target:
+
+- `cache_hit_ratio >= 0.90`
+
+## 6) Capacity Trigger Rules
+
+Define operational triggers:
+
+- Cache miss ratio > 10% for 15m
+- Chat p95 latency > 1s for 5m
+- Host CPU > 80% for 10m
+- Redis memory > 85% sustained
+
+Action mapping:
+
+- Level 1: investigate + restart non-critical components
+- Level 2: scale service resources (CPU/RAM)
+- Level 3: activate standby planning path
+
+## 7) Phase 2 Service Separation Plan
+
+Objective: separate bottlenecked services while keeping simple ops.
+
+Boundaries:
+
+- `playout` isolated first (CPU-heavy)
+- `chat` + `redis` grouped for latency
+- `db` isolated for IO stability
+- monitoring stack optionally separated after sustained load
+
+Initial sizing guidance:
+
+- playout host: 4 vCPU / 8 GB
+- chat host: 2-4 vCPU / 4-8 GB
+- db host: 2 vCPU / 4 GB + fast disk
+
+Exit criteria for Phase 2:
+
+- repeated trigger events over 7 days
+- capacity saturation despite tuning
+
+## 8) Phase 3 Warm Standby Plan
+
+Objective: second-region resilience with DNS failover.
+
+Candidate layout:
+
+- Primary: Hetzner Ashburn (US-East)
+- Standby: Hetzner Hillsboro (US-West)
+
+Design:
+
+- Warm standby stack deployed and health-checked
+- Redis replication or fallback mode documented
+- Postgres replication strategy selected (streaming replica or periodic snapshot restore)
+- Cloudflare DNS failover policy defined (health-based or manual emergency switch)
+
+Failover drill requirements:
+
+- periodic simulated cutover
+- measured RTO/RPO logged in incident records
+
+## 9) Data Capture Template
+
+For each benchmark run, capture:
+
+- Date/time
+- Environment (test-lab/staging/production)
+- Commit SHA / image tag
+- Test scenario and duration
+- Raw metrics (latency, errors, resource usage)
+- Conclusion and next action
+
+## 10) Execution Order
+
+1. TTFB baseline
+2. WebSocket load profile
+3. Admin API benchmark
+4. Cache ratio panel + alerting
+5. Trigger tuning
+6. Phase 2 boundary decision
+7. Phase 3 standby design review

frontend/admin/index.html

@@ -1,14 +1,13 @@
 <!doctype html>
 <html lang="en">
-
+  <head>
-<head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Linear Void Admin</title>
     <link rel="stylesheet" href="../src/style.css" />
-</head>
+  </head>
 
-<body class="admin-body">
+  <body class="admin-body">
     <div class="admin-shell">
       <aside class="admin-sidebar" aria-label="Primary">
         <div class="brand-block">
@@ -19,15 +18,105 @@
         <button id="logout-btn" type="button" class="btn btn-secondary btn-block">Sign out</button>
 
         <nav class="admin-nav" aria-label="Admin sections" role="tablist" aria-orientation="vertical">
-                <button type="button" id="tab-trigger-dashboard" role="tab" class="tab-trigger is-active" data-tab="dashboard" aria-controls="tab-dashboard" aria-selected="true">Dashboard</button>
+          <button
-                <button type="button" id="tab-trigger-upload" role="tab" class="tab-trigger" data-tab="upload" aria-controls="tab-upload" aria-selected="false">Upload Video</button>
+            type="button"
-                <button type="button" id="tab-trigger-playlist" role="tab" class="tab-trigger" data-tab="playlist" aria-controls="tab-playlist" aria-selected="false">Playlist</button>
+            id="tab-trigger-dashboard"
-                <button type="button" id="tab-trigger-schedule" role="tab" class="tab-trigger" data-tab="schedule" aria-controls="tab-schedule" aria-selected="false">Schedule</button>
+            role="tab"
-                <button type="button" id="tab-trigger-moderation" role="tab" class="tab-trigger" data-tab="moderation" aria-controls="tab-moderation" aria-selected="false">Moderation</button>
+            class="tab-trigger is-active"
-                <button type="button" id="tab-trigger-chat-log" role="tab" class="tab-trigger" data-tab="chat-log" aria-controls="tab-chat-log" aria-selected="false">Chat Log</button>
+            data-tab="dashboard"
-                <button type="button" id="tab-trigger-users" role="tab" class="tab-trigger" data-tab="users" aria-controls="tab-users" aria-selected="false">Users</button>
+            aria-controls="tab-dashboard"
-                <button type="button" id="tab-trigger-analytics" role="tab" class="tab-trigger" data-tab="analytics" aria-controls="tab-analytics" aria-selected="false">Analytics</button>
+            aria-selected="true"
-                <button type="button" id="tab-trigger-system" role="tab" class="tab-trigger" data-tab="system" aria-controls="tab-system" aria-selected="false">System</button>
+          >
+            Dashboard
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-upload"
+            role="tab"
+            class="tab-trigger"
+            data-tab="upload"
+            aria-controls="tab-upload"
+            aria-selected="false"
+          >
+            Upload Video
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-playlist"
+            role="tab"
+            class="tab-trigger"
+            data-tab="playlist"
+            aria-controls="tab-playlist"
+            aria-selected="false"
+          >
+            Playlist
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-schedule"
+            role="tab"
+            class="tab-trigger"
+            data-tab="schedule"
+            aria-controls="tab-schedule"
+            aria-selected="false"
+          >
+            Schedule
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-moderation"
+            role="tab"
+            class="tab-trigger"
+            data-tab="moderation"
+            aria-controls="tab-moderation"
+            aria-selected="false"
+          >
+            Moderation
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-chat-log"
+            role="tab"
+            class="tab-trigger"
+            data-tab="chat-log"
+            aria-controls="tab-chat-log"
+            aria-selected="false"
+          >
+            Chat Log
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-users"
+            role="tab"
+            class="tab-trigger"
+            data-tab="users"
+            aria-controls="tab-users"
+            aria-selected="false"
+          >
+            Users
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-analytics"
+            role="tab"
+            class="tab-trigger"
+            data-tab="analytics"
+            aria-controls="tab-analytics"
+            aria-selected="false"
+          >
+            Analytics
+          </button>
+          <button
+            type="button"
+            id="tab-trigger-system"
+            role="tab"
+            class="tab-trigger"
+            data-tab="system"
+            aria-controls="tab-system"
+            aria-selected="false"
+          >
+            System
+          </button>
         </nav>
       </aside>
 
@@ -37,6 +126,5 @@
     </div>
 
     <script type="module" src="/src/admin.ts"></script>
-</body>
+  </body>
-
 </html>

frontend/admin/login/index.html

@@ -1,14 +1,13 @@
 <!doctype html>
 <html lang="en">
-
+  <head>
-<head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Linear Void Admin Login</title>
     <link rel="stylesheet" href="../../src/style.css" />
-</head>
+  </head>
 
-<body class="auth-body">
+  <body class="auth-body">
     <main class="auth-shell" aria-label="Admin authentication">
       <section class="auth-card" aria-labelledby="auth-title">
         <p class="auth-kicker">Linear Void</p>
@@ -29,39 +28,38 @@
     </main>
 
     <script>
-        const form = document.getElementById('login-form');
+      const form = document.getElementById("login-form");
-        const username = document.getElementById('username');
+      const username = document.getElementById("username");
-        const password = document.getElementById('password');
+      const password = document.getElementById("password");
-        const submit = document.getElementById('submit');
+      const submit = document.getElementById("submit");
-        const status = document.getElementById('status');
+      const status = document.getElementById("status");
 
-        form.addEventListener('submit', async (event) => {
+      form.addEventListener("submit", async (event) => {
         event.preventDefault();
         submit.disabled = true;
-            status.textContent = 'Signing in...';
+        status.textContent = "Signing in...";
-            status.className = 'status-line';
+        status.className = "status-line";
 
         try {
-                const response = await fetch('/api/admin/login', {
+          const response = await fetch("/api/admin/login", {
-                    method: 'POST',
+            method: "POST",
-                    headers: { 'Content-Type': 'application/json' },
+            headers: { "Content-Type": "application/json" },
-                    body: JSON.stringify({ username: username.value, password: password.value })
+            body: JSON.stringify({ username: username.value, password: password.value }),
           });
 
           if (!response.ok) {
             throw new Error(`HTTP ${response.status}`);
           }
 
-                window.location.href = '/admin/';
+          window.location.href = "/admin/";
         } catch (error) {
-                console.error('Failed to sign in', error);
+          console.error("Failed to sign in", error);
-                status.textContent = 'Login failed. Check your credentials.';
+          status.textContent = "Login failed. Check your credentials.";
-                status.className = 'status-line status-error';
+          status.className = "status-line status-error";
         } finally {
           submit.disabled = false;
         }
       });
     </script>
-</body>
+  </body>
-
 </html>

frontend/index.html

@@ -1,14 +1,13 @@
 <!doctype html>
 <html lang="en">
-
+  <head>
-<head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Linear Void - 24/7 Synchronized Channel</title>
     <link rel="stylesheet" href="/src/style.css" />
-</head>
+  </head>
 
-<body class="lv-body">
+  <body class="lv-body">
     <main class="viewer-shell" aria-label="Live player and chat">
       <header class="viewer-header">
         <div class="viewer-brand-group">
@@ -18,7 +17,16 @@
             <p class="viewer-subtitle">24/7 Synchronized Channel • Live</p>
           </div>
         </div>
-      <button id="chat-toggle" type="button" class="btn btn-secondary chat-toggle-btn" onclick="toggleChatPanel()" aria-controls="chat-panel" aria-expanded="true">Hide Chat</button>
+        <button
+          id="chat-toggle"
+          type="button"
+          class="btn btn-secondary chat-toggle-btn"
+          onclick="toggleChatPanel()"
+          aria-controls="chat-panel"
+          aria-expanded="true"
+        >
+          Hide Chat
+        </button>
       </header>
 
       <section class="viewer-content" aria-label="Live stream and chat layout">
@@ -48,18 +56,21 @@
           <div class="chat-input-area">
             <div class="chat-input-row">
               <label for="message-input" class="sr-only">Message input</label>
-            <input id="message-input" type="text" placeholder="Type a message..." class="input" onkeydown="if(event.key === 'Enter') sendMessage()" />
+              <input
+                id="message-input"
+                type="text"
+                placeholder="Type a message..."
+                class="input"
+                onkeydown="if (event.key === 'Enter') sendMessage();"
+              />
               <button type="button" class="btn btn-primary" onclick="sendMessage()">Send</button>
             </div>
-          <p class="chat-note">
+            <p class="chat-note">Synced with video • Moderation active</p>
-            Synced with video • Moderation active
-          </p>
           </div>
         </aside>
       </section>
     </main>
 
     <script type="module" src="/src/main.ts"></script>
-</body>
+  </body>
-
 </html>

frontend/package.json

@@ -1,17 +1,22 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "1.0.9",
+  "version": "1.0.10",
   "type": "module",
   "scripts": {
     "dev": "vite",
     "build": "tsc && vite build",
     "preview": "vite preview",
-    "lint": "tsc --noEmit"
+    "lint": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "devDependencies": {
+    "@vitest/ui": "^4.1.10",
+    "jsdom": "^30.0.1",
     "typescript": "~6.0.2",
-    "vite": "^8.2.0"
+    "vite": "^8.2.0",
+    "vitest": "^4.1.10"
   },
   "dependencies": {
     "hls.js": "^1.6.16"

frontend/public/admin/analytics.html

@@ -4,7 +4,7 @@
     <p>Basic activity counters from chat history and moderation audit logs.</p>
   </div>
   <div class="button-row">
-        <select id="analytics-range" class="text-input" style="width:auto">
+    <select id="analytics-range" class="text-input" style="width: auto">
       <option value="1h">Last hour</option>
       <option value="6h">Last 6 hours</option>
       <option value="24h" selected>Last 24 hours</option>

frontend/public/admin/moderation.html

@@ -13,7 +13,8 @@
   <section class="panel-card">
     <h2>New Action</h2>
     <form id="moderation-form" class="form-stack">
-            <label>Action
+      <label
+        >Action
         <select id="mod-action" class="text-input">
           <option value="mute">mute</option>
           <option value="ban">ban</option>
@@ -21,17 +22,26 @@
           <option value="timeout">timeout</option>
         </select>
       </label>
-            <label>Target
+      <label
+        >Target
         <input id="mod-target" class="text-input" type="text" placeholder="username or message id" required />
       </label>
-            <label>Moderator
+      <label
+        >Moderator
         <input id="mod-moderator" class="text-input" type="text" placeholder="admin" />
       </label>
-            <label>Room
+      <label
+        >Room
         <input id="mod-room" class="text-input" type="text" placeholder="main" />
       </label>
-            <label>Reason
+      <label
-                <textarea id="mod-reason" class="text-input text-area" placeholder="Explain why this action is needed" required></textarea>
+        >Reason
+        <textarea
+          id="mod-reason"
+          class="text-input text-area"
+          placeholder="Explain why this action is needed"
+          required
+        ></textarea>
       </label>
       <button id="mod-submit" type="submit" class="btn btn-primary">Submit action</button>
       <p id="moderation-status" class="status-line" aria-live="polite">Loading moderation logs...</p>

frontend/public/admin/schedule.html

@@ -7,7 +7,10 @@
 </div>
 
 <div class="panel-card">
-    <p class="small-muted"><span id="schedule-matched-entries">0</span>/<span id="schedule-total-entries">0</span> matched • total runtime <span id="schedule-total-runtime">00:00:00</span></p>
+  <p class="small-muted">
+    <span id="schedule-matched-entries">0</span>/<span id="schedule-total-entries">0</span> matched • total runtime
+    <span id="schedule-total-runtime">00:00:00</span>
+  </p>
   <div class="table-wrap">
     <table class="data-table">
       <thead>
@@ -28,7 +31,7 @@
 <div class="panel-card">
   <h2>Schedule Overrides</h2>
   <p>Insert scheduled overrides to play specific videos at specific times.</p>
-    <form id="override-form" class="form-stack" style="max-width:500px">
+  <form id="override-form" class="form-stack" style="max-width: 500px">
     <label>Media ID <input id="override-media-id" type="number" class="text-input" required /></label>
     <label>Start Time <input id="override-start" type="datetime-local" class="text-input" required /></label>
     <label>End Time <input id="override-end" type="datetime-local" class="text-input" required /></label>
@@ -36,7 +39,7 @@
     <button type="submit" class="btn btn-primary">Add Override</button>
   </form>
   <p id="override-status" class="status-line" aria-live="polite"></p>
-    <div class="table-wrap" style="margin-top:1rem">
+  <div class="table-wrap" style="margin-top: 1rem">
     <table class="data-table">
       <thead>
         <tr>

frontend/public/admin/system.html

@@ -55,7 +55,7 @@
 
 <div class="panel-card">
   <h2>Runtime Configuration</h2>
-    <form id="config-form" class="form-stack" style="max-width:400px">
+  <form id="config-form" class="form-stack" style="max-width: 400px">
     <label>Rate Limit Max <input id="config-rate-max" type="number" class="text-input" /></label>
     <label>Rate Limit Window (seconds) <input id="config-rate-window" type="number" class="text-input" /></label>
     <button type="submit" class="btn btn-primary">Save Config</button>

frontend/public/admin/upload.html

@@ -8,7 +8,9 @@
 
 <div id="upload-dropzone" class="upload-dropzone">
   <input type="file" id="video-upload" accept="video/*,.mp4,.mov,.mkv,.webm" hidden />
-    <button id="upload-trigger-btn" type="button" class="btn btn-primary btn-large">Drag and Drop or Click to Upload</button>
+  <button id="upload-trigger-btn" type="button" class="btn btn-primary btn-large">
+    Drag and Drop or Click to Upload
+  </button>
   <p class="small-muted">Resumable chunk upload enabled • up to 2GB per file.</p>
   <div id="media-upload-progress-wrap" class="upload-progress" hidden>
     <progress id="media-upload-progress" value="0" max="100"></progress>

frontend/src/admin.test.ts

@@ -0,0 +1,142 @@
+/// <reference types="vitest" />
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+
+// Mock fetch globally
+let fetchCalls: { url: string; options?: RequestInit }[] = [];
+let mockFetchResponse: any = { ok: true, json: () => Promise.resolve({}) };
+
+beforeEach(() => {
+  fetchCalls = [];
+  globalThis.fetch = vi.fn((url: string, options?: RequestInit) => {
+    fetchCalls.push({ url, options });
+    return Promise.resolve(
+      new Response(JSON.stringify(mockFetchResponse.json ? mockFetchResponse.json() : mockFetchResponse), {
+        status: mockFetchResponse.ok ? 200 : mockFetchResponse.status || 500,
+        headers: { "Content-Type": "application/json" },
+      }),
+    );
+  }) as any;
+
+  // Mock localStorage
+  const storage = new Map<string, string>();
+  Object.defineProperty(window, "localStorage", {
+    value: {
+      getItem: vi.fn((key: string) => storage.get(key) ?? null),
+      setItem: vi.fn((key: string, val: string) => storage.set(key, val)),
+      removeItem: vi.fn((key: string) => storage.delete(key)),
+    },
+    writable: true,
+  });
+
+  // Mock window.confirm/prompt
+  vi.spyOn(window, "confirm").mockReturnValue(true);
+  vi.spyOn(window, "prompt").mockReturnValue(null);
+  vi.spyOn(console, "error").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+// Import after mocks are set
+import "../src/admin";
+
+describe("admin.ts initialization", () => {
+  it("loads and exposes tab switching", () => {
+    // After import, init() runs on DOMContentLoaded
+    // Test that the document has admin page structure
+    expect(document.body).toBeDefined();
+  });
+});
+
+describe("upload progress helpers", () => {
+  it("renders upload progress correctly", async () => {
+    // Set up DOM for upload page
+    document.body.innerHTML = `
+      <div id="media-upload-progress-wrap" hidden>
+        <progress id="media-upload-progress" max="100" value="0"></progress>
+        <span id="media-upload-progress-text"></span>
+      </div>
+      <div id="tab-content"></div>
+    `;
+
+    // Re-import triggers init again — but we need fresh module state
+    // For now test internal helper access via body
+    const wrap = document.getElementById("media-upload-progress-wrap")!;
+    const bar = document.getElementById("media-upload-progress") as HTMLProgressElement;
+    const text = document.getElementById("media-upload-progress-text")!;
+
+    expect(wrap.hidden).toBe(true);
+
+    // Simulate what setUploadProgress would do
+    wrap.hidden = false;
+    bar.max = 100;
+    bar.value = 50;
+    text.textContent = "Uploading (50%)";
+
+    expect(wrap.hidden).toBe(false);
+    expect(bar.value).toBe(50);
+    expect(text.textContent).toBe("Uploading (50%)");
+  });
+});
+
+describe("file fingerprint", () => {
+  it("generates unique fingerprints for different files", () => {
+    const f1 = new File(["a"], "video1.mp4", { lastModified: 1 });
+    const f2 = new File(["b"], "video2.mp4", { lastModified: 2 });
+
+    const fp1 = `${f1.name}:${f1.size}:${f1.lastModified}`;
+    const fp2 = `${f2.name}:${f2.size}:${f2.lastModified}`;
+
+    expect(fp1).not.toBe(fp2);
+    expect(fp1).toBe("video1.mp4:1:1");
+    expect(fp2).toBe("video2.mp4:1:2");
+  });
+});
+
+describe("MAX_UPLOAD_BYTES constant", () => {
+  it("equals 2GB", () => {
+    expect(2 * 1024 * 1024 * 1024).toBe(2147483648);
+  });
+});
+
+describe("API calls on tab load", () => {
+  beforeEach(() => {
+    document.body.innerHTML = `
+      <div id="tab-content"><div id="overview-content"></div></div>
+      <nav class="admin-nav">
+        <button data-tab="dashboard">Dashboard</button>
+        <button data-tab="analytics">Analytics</button>
+        <button data-tab="playlist">Playlist</button>
+        <button data-tab="schedule">Schedule</button>
+        <button data-tab="system">System</button>
+        <button data-tab="upload">Upload</button>
+        <button data-tab="users">Users</button>
+        <button data-tab="moderation">Moderation</button>
+        <button data-tab="chat-log">Chat Log</button>
+      </nav>
+      <div id="overview-stats"></div>
+      <div id="analytics-stats"></div>
+      <div id="playlist-editor"></div>
+      <div id="schedule-list"></div>
+      <div id="system-summary"></div>
+      <div id="media-upload-progress-wrap" hidden>
+        <progress id="media-upload-progress"></progress>
+        <span id="media-upload-progress-text"></span>
+      </div>
+      <div id="media-table-body"></div>
+      <div id="users-table-body"></div>
+      <div id="moderation-log-table-body"></div>
+      <div id="chat-log-table-body"></div>
+      <div id="chat-log-pagination"></div>
+      <div id="config-editor"></div>
+      <span id="restart-status"></span>
+      <div id="schedule-override-list"></div>
+    `;
+  });
+
+  it("can be imported without crashing", () => {
+    // admin.ts initialization should not throw
+    expect(true).toBe(true);
+  });
+});

frontend/src/admin.ts

@@ -19,18 +19,12 @@ type MediaEntry = {
 };
 
 const bodyDataset = document.body.dataset;
-const moderationLogLimit = Number.parseInt(
+const moderationLogLimit = Number.parseInt(bodyDataset.adminModerationLogLimit || "", 10);
-  bodyDataset.adminModerationLogLimit || "",
-  10,
-);
 
 const adminConfig = {
   defaultModerator: bodyDataset.adminDefaultModerator || "admin",
   defaultRoom: bodyDataset.adminDefaultRoom || "main",
-  moderationLogLimit:
+  moderationLogLimit: Number.isFinite(moderationLogLimit) && moderationLogLimit > 0 ? moderationLogLimit : 50,
-    Number.isFinite(moderationLogLimit) && moderationLogLimit > 0
-      ? moderationLogLimit
-      : 50,
 };
 
 const MAX_UPLOAD_BYTES = 2 * 1024 * 1024 * 1024;
@@ -43,16 +37,11 @@ const state = {
   playlistSaving: false,
 };
 
-const uploadProgressWrap = () =>
+const uploadProgressWrap = () => document.getElementById("media-upload-progress-wrap") as HTMLElement | null;
-  document.getElementById("media-upload-progress-wrap") as HTMLElement | null;
 
-const uploadProgressBar = () =>
+const uploadProgressBar = () => document.getElementById("media-upload-progress") as HTMLProgressElement | null;
-  document.getElementById(
-    "media-upload-progress",
-  ) as HTMLProgressElement | null;
 
-const uploadProgressText = () =>
+const uploadProgressText = () => document.getElementById("media-upload-progress-text") as HTMLElement | null;
-  document.getElementById("media-upload-progress-text") as HTMLElement | null;
 
 const setUploadProgress = (value: number, total: number, label: string) => {
   const wrap = uploadProgressWrap();
@@ -73,11 +62,9 @@ const hideUploadProgress = () => {
   if (wrap) wrap.hidden = true;
 };
 
-const getFileFingerprint = (file: File) =>
+const getFileFingerprint = (file: File) => `${file.name}:${file.size}:${file.lastModified}`;
-  `${file.name}:${file.size}:${file.lastModified}`;
 
-const getResumeStorageKey = (fingerprint: string) =>
+const getResumeStorageKey = (fingerprint: string) => `${UPLOAD_RESUME_KEY_PREFIX}${fingerprint}`;
-  `${UPLOAD_RESUME_KEY_PREFIX}${fingerprint}`;
 
 const getStoredUploadId = (fingerprint: string) => {
   try {
@@ -221,10 +208,7 @@ async function refreshAnalytics() {
     setText("analytics-total-messages", String(payload.totalMessages ?? 0));
     setText("analytics-messages-24h", String(payload.messagesLast24Hours ?? 0));
     setText("analytics-distinct-rooms", String(payload.distinctRooms ?? 0));
-    setText(
+    setText("analytics-moderation-actions", String(payload.moderationActions ?? 0));
-      "analytics-moderation-actions",
-      String(payload.moderationActions ?? 0),
-    );
     setText("analytics-generated-at", payload.generatedAt || "unavailable");
 
     const tbody = document.getElementById("analytics-table-body");
@@ -260,9 +244,7 @@ async function refreshPlaylist() {
 
     const payload = await response.json();
     const content: string = payload.content || "";
-    const textarea = document.getElementById(
+    const textarea = document.getElementById("playlist-content") as HTMLTextAreaElement | null;
-      "playlist-content",
-    ) as HTMLTextAreaElement | null;
     if (textarea) textarea.value = content;
     renderPlaylistSortable(content);
     await showPlaylistWarnings(content);
@@ -279,7 +261,10 @@ function renderPlaylistSortable(content: string) {
   const lines = content.split("\n").filter((l) => l.trim() && !l.startsWith("#"));
   list.innerHTML = lines
     .map((line, i) => {
-      const path = line.replace(/^file\s+/, "").replace(/['"]/g, "").trim();
+      const path = line
+        .replace(/^file\s+/, "")
+        .replace(/['"]/g, "")
+        .trim();
       return `<li class="sortable-item" draggable="true" data-index="${i}">
         <span class="drag-handle" aria-hidden="true">⋮⋮</span>
         <span class="sortable-index">${i + 1}</span>
@@ -348,12 +333,17 @@ async function showPlaylistWarnings(content: string) {
       const mediaPaths = new Set((media.files || []).map((f: { path: string }) => f.path));
       const nonNorm = (media.files || []).filter((f: { status: string }) => f.status === "needs_normalization");
       for (const line of lines) {
-        const path = line.replace(/^file\s+/, "").replace(/['"]/g, "").trim();
+        const path = line
+          .replace(/^file\s+/, "")
+          .replace(/['"]/g, "")
+          .trim();
         if (path && !mediaPaths.has(path)) msgs.push(`Missing from media library: ${path}`);
       }
       if (nonNorm.length > 0) msgs.push(`${nonNorm.length} file(s) need normalization. Run scripts/normalize.sh.`);
     }
-  } catch { /* ignore */ }
+  } catch {
+    /* ignore */
+  }
   if (msgs.length > 0) {
     warnings.innerHTML = msgs.map((m) => `<div class="warning-msg">⚠ ${m}</div>`).join("");
     warnings.hidden = false;
@@ -368,9 +358,7 @@ async function savePlaylist() {
   setStatus("playlist-status", "Saving playlist...");
 
   try {
-    const textarea = document.getElementById(
+    const textarea = document.getElementById("playlist-content") as HTMLTextAreaElement | null;
-      "playlist-content",
-    ) as HTMLTextAreaElement | null;
     const content = textarea?.value || "";
 
     const response = await fetch("/api/admin/playlist", {
@@ -415,10 +403,7 @@ async function refreshSchedule() {
       });
     }
 
-    setStatus(
+    setStatus("schedule-status", `Schedule loaded. Total runtime ${payload.totalRuntime || "00:00:00"}.`);
-      "schedule-status",
-      `Schedule loaded. Total runtime ${payload.totalRuntime || "00:00:00"}.`,
-    );
   } catch (error) {
     console.error("Failed to load schedule", error);
     setStatus("schedule-status", "Failed to load schedule.", true);
@@ -445,7 +430,9 @@ async function refreshOverrides() {
     tbody.querySelectorAll("[data-delete-override]").forEach((btn) => {
       btn.addEventListener("click", () => deleteOverride(Number((btn as HTMLElement).dataset.deleteOverride)));
     });
-  } catch { /* non-critical */ }
+  } catch {
+    /* non-critical */
+  }
 }
 
 async function submitOverride(e: Event) {
@@ -460,18 +447,37 @@ async function submitOverride(e: Event) {
     const resp = await fetch("/api/admin/schedule/overrides", {
       method: "POST",
       headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ mediaId: Number(mediaId), startTime: new Date(startTime).toISOString(), endTime: new Date(endTime).toISOString(), reason }),
+      body: JSON.stringify({
+        mediaId: Number(mediaId),
+        startTime: new Date(startTime).toISOString(),
+        endTime: new Date(endTime).toISOString(),
+        reason,
+      }),
     });
-    if (!resp.ok) { const text = await resp.text(); throw new Error(text); }
+    if (!resp.ok) {
-    if (status) { status.textContent = "Override added."; status.className = "status-line"; }
+      const text = await resp.text();
+      throw new Error(text);
+    }
+    if (status) {
+      status.textContent = "Override added.";
+      status.className = "status-line";
+    }
     refreshOverrides();
   } catch (err) {
-    if (status) { status.textContent = `Failed: ${err}`; status.className = "status-line status-error"; }
+    if (status) {
+      status.textContent = `Failed: ${err}`;
+      status.className = "status-line status-error";
+    }
   }
 }
 
 async function deleteOverride(id: number) {
-  try { await fetch(`/api/admin/schedule/overrides?id=${id}`, { method: "DELETE" }); refreshOverrides(); } catch { /* ignore */ }
+  try {
+    await fetch(`/api/admin/schedule/overrides?id=${id}`, { method: "DELETE" });
+    refreshOverrides();
+  } catch {
+    /* ignore */
+  }
 }
 
 async function refreshSystemSummary() {
@@ -540,12 +546,8 @@ function renderMediaRows(files: MediaEntry[]) {
         <button type="button" class="btn btn-danger btn-small" data-action="delete" data-id="${file.id || ""}">Delete</button>
       </td>
     `;
-    tr.querySelector('[data-action="edit"]')?.addEventListener("click", () =>
+    tr.querySelector('[data-action="edit"]')?.addEventListener("click", () => editMedia(file));
-      editMedia(file),
+    tr.querySelector('[data-action="delete"]')?.addEventListener("click", () => deleteMedia(file));
-    );
-    tr.querySelector('[data-action="delete"]')?.addEventListener("click", () =>
-      deleteMedia(file),
-    );
     tbody.appendChild(tr);
   });
 }
@@ -612,18 +614,11 @@ async function uploadVideo(file: File) {
 
     const alreadyUploaded = Number(initPayload.uploadedChunks || 0);
     const effectiveTotalChunks = Number(initPayload.totalChunks || totalChunks);
-    const resumeFrom = Math.min(
+    const resumeFrom = Math.min(Math.max(alreadyUploaded, 0), effectiveTotalChunks);
-      Math.max(alreadyUploaded, 0),
-      effectiveTotalChunks,
-    );
 
     setUploadProgress(resumeFrom, effectiveTotalChunks, "Uploading chunks");
 
-    for (
+    for (let chunkIndex = resumeFrom; chunkIndex < effectiveTotalChunks; chunkIndex += 1) {
-      let chunkIndex = resumeFrom;
-      chunkIndex < effectiveTotalChunks;
-      chunkIndex += 1
-    ) {
       const start = chunkIndex * UPLOAD_CHUNK_BYTES;
       const end = Math.min(file.size, start + UPLOAD_CHUNK_BYTES);
       const chunk = file.slice(start, end);
@@ -641,23 +636,13 @@ async function uploadVideo(file: File) {
         throw new Error(await readErrorMessage(chunkResponse));
       }
 
-      setUploadProgress(
+      setUploadProgress(chunkIndex + 1, effectiveTotalChunks, "Uploading chunks");
-        chunkIndex + 1,
+      setStatus("media-status", `Uploading ${file.name} (${chunkIndex + 1}/${effectiveTotalChunks} chunks)...`);
-        effectiveTotalChunks,
-        "Uploading chunks",
-      );
-      setStatus(
-        "media-status",
-        `Uploading ${file.name} (${chunkIndex + 1}/${effectiveTotalChunks} chunks)...`,
-      );
     }
 
-    const completeResponse = await fetch(
+    const completeResponse = await fetch(`/api/admin/media/uploads/${encodeURIComponent(uploadId)}/complete`, {
-      `/api/admin/media/uploads/${encodeURIComponent(uploadId)}/complete`,
-      {
       method: "POST",
-      },
+    });
-    );
 
     if (!completeResponse.ok) {
       throw new Error(await readErrorMessage(completeResponse));
@@ -674,13 +659,8 @@ async function uploadVideo(file: File) {
     await refreshSchedule();
   } catch (error) {
     console.error("Failed to upload media", error);
-    const details =
+    const details = error instanceof Error ? error.message : "Unknown upload error.";
-      error instanceof Error ? error.message : "Unknown upload error.";
+    setStatus("media-status", `Upload interrupted. Re-select the same file to resume. (${details})`, true);
-    setStatus(
-      "media-status",
-      `Upload interrupted. Re-select the same file to resume. (${details})`,
-      true,
-    );
   } finally {
     state.mediaUploading = false;
     setTimeout(() => hideUploadProgress(), 1200);
@@ -749,9 +729,7 @@ async function deleteMedia(file: MediaEntry) {
 async function refreshModerationLogs() {
   setStatus("moderation-status", "Loading moderation logs...");
   try {
-    const response = await fetch(
+    const response = await fetch(`/api/admin/moderation/logs?limit=${adminConfig.moderationLogLimit}`);
-      `/api/admin/moderation/logs?limit=${adminConfig.moderationLogLimit}`,
-    );
     if (!response.ok) throw new Error(`HTTP ${response.status}`);
 
     const payload = await response.json();
@@ -787,10 +765,8 @@ async function submitModerationAction(event: Event) {
   const payload = {
     action: (document.getElementById("mod-action") as HTMLSelectElement).value,
     target: (document.getElementById("mod-target") as HTMLInputElement).value,
-    moderator: (document.getElementById("mod-moderator") as HTMLInputElement)
+    moderator: (document.getElementById("mod-moderator") as HTMLInputElement).value,
-      .value,
+    reason: (document.getElementById("mod-reason") as HTMLTextAreaElement).value,
-    reason: (document.getElementById("mod-reason") as HTMLTextAreaElement)
-      .value,
     room: (document.getElementById("mod-room") as HTMLInputElement).value,
   };
 
@@ -865,10 +841,7 @@ async function refreshChatLog() {
     renderChatLogTable();
     updateChatLogPagination();
     updateBulkDeleteButton();
-    setStatus(
+    setStatus("chat-log-status", `Loaded ${chatLogState.entries.length} entries.`);
-      "chat-log-status",
-      `Loaded ${chatLogState.entries.length} entries.`,
-    );
   } catch (error) {
     console.error("Failed to load chat log", error);
     setStatus("chat-log-status", "Failed to load chat log.", true);
@@ -908,10 +881,7 @@ function renderChatLogTable() {
     tr.querySelector('[data-action="chat-ban"]')?.addEventListener("click", () => {
       if (confirm(`Ban ${entry.username}?`)) userAction("ban", entry.username);
     });
-    tr.querySelector('[data-action="delete-chat"]')?.addEventListener(
+    tr.querySelector('[data-action="delete-chat"]')?.addEventListener("click", () => deleteChatEntry(entry.id));
-      "click",
-      () => deleteChatEntry(entry.id),
-    );
     tr.querySelector(".chat-log-checkbox")?.addEventListener("change", (e) => {
       const cb = e.target as HTMLInputElement;
       if (cb.checked) {
@@ -929,38 +899,27 @@ function renderChatLogTable() {
 }
 
 function updateSelectAllCheckbox() {
-  const selectAll = document.getElementById(
+  const selectAll = document.getElementById("chat-log-select-all") as HTMLInputElement | null;
-    "chat-log-select-all",
-  ) as HTMLInputElement | null;
   if (!selectAll) return;
   const allSelected =
-    chatLogState.entries.length > 0 &&
+    chatLogState.entries.length > 0 && chatLogState.entries.every((e) => chatLogState.selected.has(e.id));
-    chatLogState.entries.every((e) => chatLogState.selected.has(e.id));
   selectAll.checked = allSelected;
 }
 
 function updateBulkDeleteButton() {
-  const btn = document.getElementById(
+  const btn = document.getElementById("bulk-delete-chat-log-btn") as HTMLButtonElement | null;
-    "bulk-delete-chat-log-btn",
-  ) as HTMLButtonElement | null;
   if (!btn) return;
   btn.disabled = chatLogState.selected.size === 0;
 }
 
 function updateChatLogPagination() {
-  const prevBtn = document.getElementById(
+  const prevBtn = document.getElementById("chat-log-prev-btn") as HTMLButtonElement | null;
-    "chat-log-prev-btn",
+  const nextBtn = document.getElementById("chat-log-next-btn") as HTMLButtonElement | null;
-  ) as HTMLButtonElement | null;
-  const nextBtn = document.getElementById(
-    "chat-log-next-btn",
-  ) as HTMLButtonElement | null;
   const info = document.getElementById("chat-log-page-info");
 
   if (prevBtn) prevBtn.disabled = !chatLogState.before;
-  if (nextBtn)
+  if (nextBtn) nextBtn.disabled = chatLogState.entries.length < chatLogState.limit;
-    nextBtn.disabled = chatLogState.entries.length < chatLogState.limit;
+  if (info) info.textContent = `Showing ${chatLogState.entries.length} of ${chatLogState.total}`;
-  if (info)
-    info.textContent = `Showing ${chatLogState.entries.length} of ${chatLogState.total}`;
 }
 
 function chatLogNextPage() {
@@ -975,29 +934,17 @@ function chatLogPrevPage() {
 }
 
 function chatLogApplyFilter() {
-  chatLogState.room =
+  chatLogState.room = (document.getElementById("chat-log-filter-room") as HTMLInputElement)?.value || "";
-    (document.getElementById("chat-log-filter-room") as HTMLInputElement)
+  chatLogState.username = (document.getElementById("chat-log-filter-username") as HTMLInputElement)?.value || "";
-      ?.value || "";
+  chatLogState.text = (document.getElementById("chat-log-filter-text") as HTMLInputElement)?.value || "";
-  chatLogState.username =
-    (document.getElementById("chat-log-filter-username") as HTMLInputElement)
-      ?.value || "";
-  chatLogState.text =
-    (document.getElementById("chat-log-filter-text") as HTMLInputElement)
-      ?.value || "";
   chatLogState.before = "";
   refreshChatLog();
 }
 
 function chatLogClearFilter() {
-  const roomEl = document.getElementById(
+  const roomEl = document.getElementById("chat-log-filter-room") as HTMLInputElement | null;
-    "chat-log-filter-room",
+  const userEl = document.getElementById("chat-log-filter-username") as HTMLInputElement | null;
-  ) as HTMLInputElement | null;
+  const textEl = document.getElementById("chat-log-filter-text") as HTMLInputElement | null;
-  const userEl = document.getElementById(
-    "chat-log-filter-username",
-  ) as HTMLInputElement | null;
-  const textEl = document.getElementById(
-    "chat-log-filter-text",
-  ) as HTMLInputElement | null;
   if (roomEl) roomEl.value = "";
   if (userEl) userEl.value = "";
   if (textEl) textEl.value = "";
@@ -1009,8 +956,7 @@ function chatLogClearFilter() {
 }
 
 async function deleteChatEntry(id: number) {
-  if (!window.confirm(`Delete chat message #${id}? This cannot be undone.`))
+  if (!window.confirm(`Delete chat message #${id}? This cannot be undone.`)) return;
-    return;
 
   setStatus("chat-log-status", `Deleting message #${id}...`);
   try {
@@ -1030,17 +976,9 @@ async function deleteChatEntry(id: number) {
 async function bulkDeleteChatLog() {
   if (chatLogState.selected.size === 0) return;
 
-  if (
+  if (!window.confirm(`Delete ${chatLogState.selected.size} selected messages? This cannot be undone.`)) return;
-    !window.confirm(
-      `Delete ${chatLogState.selected.size} selected messages? This cannot be undone.`,
-    )
-  )
-    return;
 
-  setStatus(
+  setStatus("chat-log-status", `Deleting ${chatLogState.selected.size} messages...`);
-    "chat-log-status",
-    `Deleting ${chatLogState.selected.size} messages...`,
-  );
   try {
     const ids = Array.from(chatLogState.selected);
     const response = await fetch("/api/admin/chat-log/bulk", {
@@ -1050,10 +988,7 @@ async function bulkDeleteChatLog() {
     });
     if (!response.ok) throw new Error(`HTTP ${response.status}`);
     const payload = await response.json();
-    setStatus(
+    setStatus("chat-log-status", `${payload.deleted || ids.length} messages deleted.`);
-      "chat-log-status",
-      `${payload.deleted || ids.length} messages deleted.`,
-    );
     await refreshChatLog();
     await refreshOverview();
   } catch (error) {
@@ -1088,17 +1023,23 @@ async function refreshUsers() {
           </td>`;
         tbody.appendChild(tr);
       });
-      tbody.querySelectorAll(".user-mute").forEach(b => b.addEventListener("click", () => userAction("mute", (b as HTMLElement).dataset.user!)));
+      tbody
-      tbody.querySelectorAll(".user-ban").forEach(b => b.addEventListener("click", () => userAction("ban", (b as HTMLElement).dataset.user!)));
+        .querySelectorAll(".user-mute")
-      tbody.querySelectorAll(".user-unmute").forEach(b => b.addEventListener("click", () => userAction("unmute", (b as HTMLElement).dataset.user!)));
+        .forEach((b) => b.addEventListener("click", () => userAction("mute", (b as HTMLElement).dataset.user!)));
-      tbody.querySelectorAll(".user-unban").forEach(b => b.addEventListener("click", () => userAction("unban", (b as HTMLElement).dataset.user!)));
+      tbody
+        .querySelectorAll(".user-ban")
+        .forEach((b) => b.addEventListener("click", () => userAction("ban", (b as HTMLElement).dataset.user!)));
+      tbody
+        .querySelectorAll(".user-unmute")
+        .forEach((b) => b.addEventListener("click", () => userAction("unmute", (b as HTMLElement).dataset.user!)));
+      tbody
+        .querySelectorAll(".user-unban")
+        .forEach((b) => b.addEventListener("click", () => userAction("unban", (b as HTMLElement).dataset.user!)));
     }
 
     setStatus(
       "users-status",
-      payload.redisEnabled
+      payload.redisEnabled ? "Active users loaded." : "Redis disabled; no live presence data available.",
-        ? "Active users loaded."
-        : "Redis disabled; no live presence data available.",
     );
   } catch (error) {
     console.error("Failed to load users", error);
@@ -1127,7 +1068,9 @@ async function loadConfig() {
     const cfg = await resp.json();
     (document.getElementById("config-rate-max") as HTMLInputElement).value = cfg.rateLimitMax;
     (document.getElementById("config-rate-window") as HTMLInputElement).value = cfg.rateLimitWindowSec;
-  } catch { /* non-critical */ }
+  } catch {
+    /* non-critical */
+  }
 }
 
 async function saveConfig(e: Event) {
@@ -1144,9 +1087,15 @@ async function saveConfig(e: Event) {
       }),
     });
     if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
-    if (status) { status.textContent = "Config saved."; status.className = "status-line"; }
+    if (status) {
+      status.textContent = "Config saved.";
+      status.className = "status-line";
+    }
   } catch (err) {
-    if (status) { status.textContent = `Failed: ${err}`; status.className = "status-line status-error"; }
+    if (status) {
+      status.textContent = `Failed: ${err}`;
+      status.className = "status-line status-error";
+    }
   }
 }
 
@@ -1164,9 +1113,7 @@ async function restartService(service: string) {
 }
 
 function bindEvents() {
-  document
+  document.querySelectorAll<HTMLButtonElement>(".tab-trigger").forEach((button) => {
-    .querySelectorAll<HTMLButtonElement>(".tab-trigger")
-    .forEach((button) => {
     button.addEventListener("click", () => {
       const tab = button.dataset.tab;
       if (tab) switchTab(tab);
@@ -1186,17 +1133,11 @@ function bindEvents() {
 function bindPageEvents(tabName: string) {
   switch (tabName) {
     case "upload":
-      document
+      document.getElementById("reload-media-btn")?.addEventListener("click", refreshMediaLibrary);
-        .getElementById("reload-media-btn")
-        ?.addEventListener("click", refreshMediaLibrary);
 
-      const uploadInput = document.getElementById(
+      const uploadInput = document.getElementById("video-upload") as HTMLInputElement | null;
-        "video-upload",
-      ) as HTMLInputElement | null;
       const uploadDropzone = document.getElementById("upload-dropzone");
-      document
+      document.getElementById("upload-trigger-btn")?.addEventListener("click", () => uploadInput?.click());
-        .getElementById("upload-trigger-btn")
-        ?.addEventListener("click", () => uploadInput?.click());
 
       uploadDropzone?.addEventListener("dragover", (event) => {
         event.preventDefault();
@@ -1221,64 +1162,34 @@ function bindPageEvents(tabName: string) {
       break;
 
     case "playlist":
-      document
+      document.getElementById("reload-playlist-btn")?.addEventListener("click", refreshPlaylist);
-        .getElementById("reload-playlist-btn")
+      document.getElementById("save-playlist-btn")?.addEventListener("click", savePlaylist);
-        ?.addEventListener("click", refreshPlaylist);
-      document
-        .getElementById("save-playlist-btn")
-        ?.addEventListener("click", savePlaylist);
       break;
 
     case "schedule":
-      document
+      document.getElementById("reload-schedule-btn")?.addEventListener("click", refreshSchedule);
-        .getElementById("reload-schedule-btn")
+      document.getElementById("override-form")?.addEventListener("submit", submitOverride);
-        ?.addEventListener("click", refreshSchedule);
-      document
-        .getElementById("override-form")
-        ?.addEventListener("submit", submitOverride);
       refreshOverrides();
       break;
 
     case "moderation":
-      document
+      document.getElementById("reload-moderation-btn")?.addEventListener("click", refreshModerationLogs);
-        .getElementById("reload-moderation-btn")
+      document.getElementById("export-chat-log-btn")?.addEventListener("click", () => {
-        ?.addEventListener("click", refreshModerationLogs);
-      document
-        .getElementById("export-chat-log-btn")
-        ?.addEventListener("click", () => {
         window.open("/api/admin/chat-log/export", "_blank");
       });
-      document
+      document.getElementById("moderation-form")?.addEventListener("submit", submitModerationAction);
-        .getElementById("moderation-form")
+      (document.getElementById("mod-moderator") as HTMLInputElement).value = adminConfig.defaultModerator;
-        ?.addEventListener("submit", submitModerationAction);
+      (document.getElementById("mod-room") as HTMLInputElement).value = adminConfig.defaultRoom;
-      (document.getElementById("mod-moderator") as HTMLInputElement).value =
-        adminConfig.defaultModerator;
-      (document.getElementById("mod-room") as HTMLInputElement).value =
-        adminConfig.defaultRoom;
       break;
 
     case "chat-log":
-      document
+      document.getElementById("reload-chat-log-btn")?.addEventListener("click", refreshChatLog);
-        .getElementById("reload-chat-log-btn")
+      document.getElementById("bulk-delete-chat-log-btn")?.addEventListener("click", bulkDeleteChatLog);
-        ?.addEventListener("click", refreshChatLog);
+      document.getElementById("chat-log-filter-btn")?.addEventListener("click", chatLogApplyFilter);
-      document
+      document.getElementById("chat-log-clear-filter-btn")?.addEventListener("click", chatLogClearFilter);
-        .getElementById("bulk-delete-chat-log-btn")
+      document.getElementById("chat-log-prev-btn")?.addEventListener("click", chatLogPrevPage);
-        ?.addEventListener("click", bulkDeleteChatLog);
+      document.getElementById("chat-log-next-btn")?.addEventListener("click", chatLogNextPage);
-      document
+      document.getElementById("chat-log-select-all")?.addEventListener("change", (e) => {
-        .getElementById("chat-log-filter-btn")
-        ?.addEventListener("click", chatLogApplyFilter);
-      document
-        .getElementById("chat-log-clear-filter-btn")
-        ?.addEventListener("click", chatLogClearFilter);
-      document
-        .getElementById("chat-log-prev-btn")
-        ?.addEventListener("click", chatLogPrevPage);
-      document
-        .getElementById("chat-log-next-btn")
-        ?.addEventListener("click", chatLogNextPage);
-      document
-        .getElementById("chat-log-select-all")
-        ?.addEventListener("change", (e) => {
         const checked = (e.target as HTMLInputElement).checked;
         chatLogState.entries.forEach((entry) => {
           if (checked) {
@@ -1293,27 +1204,19 @@ function bindPageEvents(tabName: string) {
       break;
 
     case "analytics":
-      document
+      document.getElementById("reload-analytics-btn")?.addEventListener("click", refreshAnalytics);
-        .getElementById("reload-analytics-btn")
-        ?.addEventListener("click", refreshAnalytics);
       break;
 
     case "users":
-      document
+      document.getElementById("reload-users-btn")?.addEventListener("click", refreshUsers);
-        .getElementById("reload-users-btn")
-        ?.addEventListener("click", refreshUsers);
       break;
 
     case "system":
+      document.getElementById("reload-system-btn")?.addEventListener("click", refreshSystemSummary);
+      document.getElementById("config-form")?.addEventListener("submit", saveConfig);
       document
-        .getElementById("reload-system-btn")
+        .querySelectorAll(".restart-btn")
-        ?.addEventListener("click", refreshSystemSummary);
+        .forEach((btn) => btn.addEventListener("click", () => restartService((btn as HTMLElement).dataset.service!)));
-      document
-        .getElementById("config-form")
-        ?.addEventListener("submit", saveConfig);
-      document.querySelectorAll(".restart-btn").forEach((btn) =>
-        btn.addEventListener("click", () => restartService((btn as HTMLElement).dataset.service!))
-      );
       loadConfig();
       break;
   }

frontend/src/counter.ts

@@ -1,9 +1,9 @@
 export function setupCounter(element: HTMLButtonElement) {
-  let counter = 0
+  let counter = 0;
   const setCounter = (count: number) => {
-    counter = count
+    counter = count;
-    element.innerHTML = `Count is ${counter}`
+    element.innerHTML = `Count is ${counter}`;
-  }
+  };
-  element.addEventListener('click', () => setCounter(counter + 1))
+  element.addEventListener("click", () => setCounter(counter + 1));
-  setCounter(0)
+  setCounter(0);
 }

frontend/src/main.test.ts

@@ -0,0 +1,161 @@
+/// <reference types="vitest" />
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+
+// Mock hls.js
+vi.mock("hls.js", () => ({
+  default: vi.fn().mockImplementation(() => ({
+    loadSource: vi.fn(),
+    attachMedia: vi.fn(),
+    on: vi.fn(),
+    destroy: vi.fn(),
+  })),
+  Events: { MANIFEST_PARSED: "hlsManifestParsed" },
+}));
+
+// Mock WebSocket
+class MockWebSocket {
+  url: string;
+  readyState = 0;
+  onopen: (() => void) | null = null;
+  onmessage: ((e: { data: string }) => void) | null = null;
+  onclose: (() => void) | null = null;
+  send = vi.fn();
+  close = vi.fn();
+
+  constructor(url: string) {
+    this.url = url;
+  }
+}
+
+// Suppress console noise
+beforeEach(() => {
+  vi.spyOn(console, "warn").mockImplementation(() => {});
+  vi.spyOn(console, "error").mockImplementation(() => {});
+  vi.spyOn(console, "log").mockImplementation(() => {});
+});
+
+let origWebSocket: any;
+let origFetch: any;
+
+beforeEach(() => {
+  origWebSocket = (globalThis as any).WebSocket;
+  origFetch = globalThis.fetch;
+  (globalThis as any).WebSocket = MockWebSocket;
+
+  // Mock fetch (schedule, etc.) — return empty schedule
+  globalThis.fetch = vi.fn().mockResolvedValue({
+    ok: true,
+    json: () => Promise.resolve({ entries: [], total: 0, generatedAt: "" }),
+  });
+
+  // Set up DOM from index.html
+  document.body.innerHTML = `
+    <main class="viewer-shell">
+      <header class="viewer-header">
+        <button id="chat-toggle" type="button">Hide Chat</button>
+      </header>
+      <section class="viewer-content">
+        <section class="player-stage">
+          <video id="player" class="player" controls autoplay muted playsinline></video>
+          <div id="now-playing">
+            <span id="np-title">Loading...</span>
+            <span id="np-next" class="np-next"></span>
+          </div>
+        </section>
+        <aside id="chat-panel" class="chat-sidebar">
+          <div class="chat-header">
+            <span id="room-name">Main Channel</span>
+            <button type="button" onclick="togglePrivateDM()">New DM</button>
+          </div>
+          <section id="messages" class="chat-messages"></section>
+          <section id="presence-panel" class="presence-panel">
+            <div id="presence-list" class="presence-list"></div>
+          </section>
+          <div class="chat-input-area">
+            <input id="message-input" type="text" placeholder="Type a message..." />
+            <button type="button" onclick="sendMessage()">Send</button>
+          </div>
+        </aside>
+      </section>
+    </main>
+  `;
+
+  // Stub prompt for DM
+  (globalThis as any).prompt = vi.fn();
+});
+
+afterEach(() => {
+  (globalThis as any).WebSocket = origWebSocket;
+  globalThis.fetch = origFetch;
+  vi.restoreAllMocks();
+});
+
+// Must import after DOM setup
+import "../src/main";
+
+describe("chat toggle", () => {
+  it("toggles chat panel visibility", () => {
+    const panel = document.getElementById("chat-panel")!;
+    const toggle = document.getElementById("chat-toggle")!;
+
+    expect(toggle.textContent).toBe("Hide Chat");
+
+    window.toggleChatPanel();
+    expect(toggle.textContent).toBe("Show Chat");
+
+    window.toggleChatPanel();
+    expect(toggle.textContent).toBe("Hide Chat");
+  });
+});
+
+describe("sendMessage", () => {
+  it("clears input after sending non-empty text", () => {
+    const input = document.getElementById("message-input") as HTMLInputElement;
+    input.value = "hello!";
+
+    // sendMessage requires ws to be non-null — ws set in initPlayerAndChat
+    // The DOMContentLoaded triggers initPlayerAndChat which creates ws
+    // Wait for async init, then set ws manually
+    // For now just verify input state logic
+    window.sendMessage();
+    // ws is null at this point, so message won't send but input won't clear either
+    // Verify input not cleared (ws check fails before clear)
+    expect(input.value).toBe("hello!");
+  });
+
+  it("does nothing with empty input", () => {
+    const input = document.getElementById("message-input") as HTMLInputElement;
+    input.value = "   ";
+    window.sendMessage();
+    // No error thrown = pass
+  });
+});
+
+describe("switchRoom", () => {
+  it("updates room name on switch", () => {
+    window.switchRoom("lobby");
+    const roomName = document.getElementById("room-name")!;
+    expect(roomName.textContent).toBe("Lobby Room");
+  });
+
+  it("shows Main Channel for main room", () => {
+    window.switchRoom("main");
+    const roomName = document.getElementById("room-name")!;
+    expect(roomName.textContent).toBe("Main Channel");
+  });
+});
+
+describe("togglePrivateDM", () => {
+  it("prompts for username and switches room", () => {
+    // Stub prompt to return a value this time
+    vi.spyOn(window, "prompt").mockReturnValue("bob");
+
+    const switchRoomSpy = vi.spyOn(window, "switchRoom");
+    window.togglePrivateDM();
+
+    expect(window.prompt).toHaveBeenCalled();
+    expect(switchRoomSpy).not.toHaveBeenCalled(); // username is "viewerNNN" which gets set randomly
+
+    switchRoomSpy.mockRestore();
+  });
+});

frontend/src/main.ts

@@ -32,24 +32,16 @@ function resolveWebSocketBaseUrl() {
 function resolveManifestUrl() {
   const configuredUrl = import.meta.env.VITE_PUBLIC_HLS_URL?.trim();
   const cacheBust = `stream=${Date.now()}`;
-  const sameOriginManifestUrl = new URL(
+  const sameOriginManifestUrl = new URL("/hls/playlist.m3u8", window.location.origin);
-    "/hls/playlist.m3u8",
-    window.location.origin,
-  );
   sameOriginManifestUrl.searchParams.set("stream", cacheBust);
 
-  const allowCrossOriginManifest =
+  const allowCrossOriginManifest = import.meta.env.VITE_PUBLIC_HLS_CROSS_ORIGIN?.trim().toLowerCase() === "true";
-    import.meta.env.VITE_PUBLIC_HLS_CROSS_ORIGIN?.trim().toLowerCase() ===
-    "true";
 
   if (configuredUrl) {
     const manifestUrl = new URL(configuredUrl);
     manifestUrl.searchParams.set("stream", cacheBust);
 
-    if (
+    if (!allowCrossOriginManifest && manifestUrl.origin !== window.location.origin) {
-      !allowCrossOriginManifest &&
-      manifestUrl.origin !== window.location.origin
-    ) {
       return sameOriginManifestUrl.toString();
     }
 
@@ -96,12 +88,7 @@ function connectWebSocket(room: string) {
   };
 }
 
-function addMessage(
+function addMessage(type: string, text: string, sender = "", timestamp = new Date()) {
-  type: string,
-  text: string,
-  sender = "",
-  timestamp = new Date(),
-) {
   const messages = document.getElementById("messages")!;
   const div = document.createElement("div");
   div.className = "message-row";
@@ -110,9 +97,7 @@ function addMessage(
     div.classList.add("message-system-row");
     div.innerHTML = `<div class="message-system">${text}</div>`;
   } else {
-    div.classList.add(
+    div.classList.add(sender === username ? "message-self-row" : "message-other-row");
-      sender === username ? "message-self-row" : "message-other-row",
-    );
     div.innerHTML = `
       <article class="message-bubble ${sender === username ? "message-self" : "message-other"}">
         ${sender && sender !== username ? `<div class="message-sender">${sender}</div>` : ""}
@@ -131,10 +116,7 @@ function renderPresence() {
   if (!list) return;
   const sorted = [...onlineUsers].sort();
   list.innerHTML = sorted
-    .map(
+    .map((u) => `<span class="presence-dot" title="${u}"><span class="presence-indicator"></span>${u}</span>`)
-      (u) =>
-        `<span class="presence-dot" title="${u}"><span class="presence-indicator"></span>${u}</span>`,
-    )
     .join("");
 }
 
@@ -185,9 +167,7 @@ async function initPlayerAndChat() {
   refreshSchedule();
   setInterval(refreshSchedule, 30000);
 
-  console.log(
+  console.log("Linear Void Frontend initialized - HLS Player + Chat Sidebar ready");
-    "Linear Void Frontend initialized - HLS Player + Chat Sidebar ready",
-  );
 }
 
 function toggleChatPanel() {
@@ -220,9 +200,7 @@ function sendMessage() {
 function switchRoom(room: string) {
   currentRoom = room;
   document.getElementById("room-name")!.textContent =
-    room === "main"
+    room === "main" ? "Main Channel" : room.charAt(0).toUpperCase() + room.slice(1) + " Room";
-      ? "Main Channel"
-      : room.charAt(0).toUpperCase() + room.slice(1) + " Room";
   addMessage("system", `Switched to ${room} room`);
   connectWebSocket(room);
 }

frontend/src/style.css

@@ -1,8 +1,7 @@
 :root {
   color-scheme: dark;
 
-  --font-body:
+  --font-body: "Atkinson Hyperlegible", "Segoe UI", "Helvetica Neue", sans-serif;
-    "Atkinson Hyperlegible", "Segoe UI", "Helvetica Neue", sans-serif;
   --font-display: "Space Grotesk", "Segoe UI", sans-serif;
   --font-mono: "IBM Plex Mono", Consolas, monospace;
 
@@ -118,12 +117,7 @@ body {
 body {
   font-family: var(--font-body);
   color: var(--ink-0);
-  background: radial-gradient(
+  background: radial-gradient(circle at 20% 10%, var(--bg-grad-a) 0%, var(--bg-grad-b) 50%, var(--bg-grad-c) 100%);
-    circle at 20% 10%,
-    var(--bg-grad-a) 0%,
-    var(--bg-grad-b) 50%,
-    var(--bg-grad-c) 100%
-  );
   line-height: 1.45;
 }
 
@@ -262,7 +256,7 @@ select {
 .btn {
   border: 1px solid transparent;
   border-radius: var(--radius-1);
-  padding: 0.62rem 0.9rem;
+  padding: 0.2rem 0.5rem;
   font-weight: 650;
   cursor: pointer;
   transition:
@@ -411,14 +405,14 @@ select {
 
 .lv-body {
   min-height: 100vh;
-  width: 100vw;
+  width: 100%;
   height: 100vh;
   padding: 0;
   overflow: hidden;
 }
 
 .viewer-shell {
-  width: 100vw;
+  width: 100%;
   height: 100vh;
   margin: 0;
   display: grid;
@@ -467,11 +461,7 @@ select {
   font-size: 0.95rem;
   letter-spacing: 0.05em;
   color: var(--brand-contrast);
-  background: linear-gradient(
+  background: linear-gradient(140deg, var(--badge-start) 0%, var(--badge-end) 100%);
-    140deg,
-    var(--badge-start) 0%,
-    var(--badge-end) 100%
-  );
 }
 
 .brand-text,
@@ -821,7 +811,7 @@ select {
   border: 1px solid var(--line-soft);
   border-radius: var(--radius-2);
   background: var(--panel);
-  padding: var(--space-4);
+  padding: var(--space-2);
   box-shadow: var(--shadow-1);
 }
 

frontend/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    include: ["src/**/*.test.ts"],
+  },
+});

infrastructure/cloudflare/cache-rules.md

@@ -1,25 +1,25 @@
 # Cloudflare Cache Rules for Linear Void (per ADR-001)
 
-## Recommended Cache Rules for media.example.com
+## Recommended Cache Rules for media.linearvoid.tv
 
-1. **.ts segments (immutable)**
+1. **.m4s and .ts segments (immutable)**
-   - Expression: (http.host eq "media.example.com" and http.request.uri.path contains ".ts")
+   - Expression: (http.host eq "media.linearvoid.tv" and (http.request.uri.path contains ".ts" or http.request.uri.path contains ".m4s"))
    - Cache status: Eligible for cache
    - Edge Cache TTL: 1 month (or `Cache-Control: public, max-age=31536000, immutable` from origin)
    - Cache Everything: Yes
 
 2. **.m3u8 manifests (live)**
-   - Expression: (http.host eq "media.example.com" and http.request.uri.path contains ".m3u8")
+   - Expression: (http.host eq "media.linearvoid.tv" and http.request.uri.path contains ".m3u8")
    - Cache status: Eligible for cache
-   - Edge Cache TTL: 10 seconds
+   - Edge Cache TTL: 2 seconds
-   - Cache-Control: public, max-age=10, must-revalidate
+   - Cache-Control: public, max-age=2, must-revalidate
 
 3. **Static assets**
-   - Expression: (http.host eq "example.com" and http.request.uri.path contains ".js" or http.request.uri.path contains ".css")
+   - Expression: (http.host eq "linearvoid.tv" and http.request.uri.path contains ".js" or http.request.uri.path contains ".css")
    - Edge Cache TTL: 1 year (with hash in filename for immutable caching)
 
 **Tiered Cache**: Enable Smart Tiered Cache for R2 custom domain to reduce origin requests.
 
 **WAF**: Enable basic rate limiting and bot management for /ws and admin routes.
 
-These rules ensure high cache hit ratio for .ts segments while keeping live manifests fresh. Monitor cache hit ratio in Cloudflare analytics.
+These rules ensure high cache hit ratio for .m4s and .ts segments while keeping live manifests fresh. Monitor cache hit ratio in Cloudflare analytics.

infrastructure/cloudflare/worker.js

@@ -6,8 +6,8 @@ addEventListener("fetch", (event) => {
 async function handleRequest(request) {
   const url = new URL(request.url);
 
-  // Add immutable cache headers for .ts segments
+  // Add immutable cache headers for .m4s segments
-  if (url.pathname.endsWith(".ts")) {
+  if (url.pathname.endsWith(".m4s")) {
     const response = await fetch(request);
     const headers = new Headers(response.headers);
     headers.set("Cache-Control", "public, max-age=31536000, immutable");