feat: add admin video jobs management endpoints and UI for listing, cancelling, and purging video jobs

Co-authored-by: Copilot <copilot@github.com>

backend/app/routers/admin.py

@@ -1,5 +1,5 @@
 """Admin router: operational endpoints for application management."""
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends
@@ -7,6 +7,7 @@ from fastapi import APIRouter, Depends
 from ..db import get_conn, get_write_lock
 from ..dependencies import require_admin
 from ..services import models as models_service
+from ..services.models import mark_timed_out_video_jobs
 
 router = APIRouter(prefix="/admin", tags=["admin"])
 
@@ -104,3 +105,83 @@ async def refresh_models(
         "total_models": status.get("model_count"),
         "last_updated": status.get("last_updated"),
     }
+
+
+@router.get("/videos")
+async def admin_list_video_jobs(_: dict = Depends(require_admin)) -> list[dict[str, Any]]:
+    """Return all video generation jobs across all users."""
+    conn = get_conn()
+    rows = conn.execute(
+        """
+        SELECT
+            v.id, v.job_id, v.user_id, u.email, v.model_id, v.prompt,
+            v.status, v.video_url, v.created_at, v.updated_at
+        FROM generated_videos v
+        LEFT JOIN users u ON v.user_id = u.id
+        ORDER BY v.created_at DESC
+        """
+    ).fetchall()
+    return [
+        {
+            "id": str(row[0]),
+            "job_id": row[1],
+            "user_id": str(row[2]),
+            "user_email": row[3],
+            "model_id": row[4],
+            "prompt": row[5],
+            "status": row[6],
+            "video_url": row[7],
+            "created_at": row[8].isoformat() if row[8] else None,
+            "updated_at": row[9].isoformat() if row[9] else None,
+        }
+        for row in rows
+    ]
+
+
+@router.post("/videos/{job_id}/cancel", status_code=200)
+async def admin_cancel_video_job(job_id: str, _: dict = Depends(require_admin)) -> dict[str, str]:
+    """Mark a video job as 'cancelled'. Does not stop the provider job."""
+    conn = get_conn()
+    lock = get_write_lock()
+    now = datetime.now(timezone.utc)
+    async with lock:
+        conn.execute(
+            "UPDATE generated_videos SET status = 'cancelled', updated_at = ? WHERE id = ?", [
+                now, job_id]
+        )
+    return {"status": "ok", "job_id": job_id}
+
+
+@router.post("/videos/purge", status_code=200)
+async def admin_purge_video_jobs(_: dict = Depends(require_admin)) -> dict[str, Any]:
+    """Delete all completed, failed, or cancelled jobs older than 30 days."""
+    conn = get_conn()
+    lock = get_write_lock()
+    thirty_days_ago = datetime.now(
+        timezone.utc) - timedelta(days=30)
+
+    sql_count = "SELECT COUNT(*) FROM generated_videos"
+    sql_delete = """
+        DELETE FROM generated_videos
+        WHERE status IN ('completed', 'failed', 'cancelled')
+        AND updated_at < ?
+    """
+
+    async with lock:
+        before_row = conn.execute(sql_count).fetchone()
+        before = before_row[0] if before_row else 0
+
+        conn.execute(sql_delete, [thirty_days_ago])
+
+        after_row = conn.execute(sql_count).fetchone()
+        after = after_row[0] if after_row else 0
+
+    return {"deleted": before - after, "remaining": after}
+
+
+@router.post("/videos/timed-out", status_code=200)
+async def admin_mark_timed_out(_: dict = Depends(require_admin)) -> dict[str, int]:
+    """Mark video jobs that have been in 'queued' or 'processing' status for too long as 'failed'."""
+    conn = get_conn()
+    count = mark_timed_out_video_jobs(conn, timeout_minutes=120)
+    return {"timed_out": count}