feat: add audit events and runtime state snapshots to database

- Introduced new tables for audit events and runtime state snapshots in the database schema.
- Created data classes for AuditRecord and RuntimeStateRecord to represent the new entities.
- Implemented AuditRepository and RuntimeStateRepository for inserting and retrieving records.
- Enhanced the dashboard to include an audit trail section, displaying recent audit events.
- Added tests for the new audit repository and runtime lifecycle functionalities.
- Updated settings validation to ensure proper configuration for alerting features.
- Integrated alert notifications across various components, including execution sequencer and loss limits.

web/templates/dashboard.html

@@ -60,6 +60,16 @@ head_scripts %}
 >
   {% include "partials/charts.html" %}
 </section>
+
+<section
+  id="audit-shell"
+  hx-get="{{ audit_endpoint }}"
+  hx-target="this"
+  hx-trigger="load, every 20s"
+  hx-swap="outerHTML"
+>
+  {% include "partials/audit.html" %}
+</section>
 {% endblock %} {% block scripts %}
 <script>
   window.arbitradeRenderCharts = (payload) => {

web/templates/partials/audit.html

@@ -0,0 +1,37 @@
+<div id="audit-panel" class="panel" style="margin-top: 16px">
+  <div class="label">Audit Trail</div>
+  <div class="meta">Generated {{ generated_at }}</div>
+
+  <div style="overflow-x: auto; margin-top: 12px">
+    <table style="width: 100%; border-collapse: collapse; font-size: 0.9rem">
+      <thead>
+        <tr>
+          <th style="text-align: left; padding: 8px">Time</th>
+          <th style="text-align: left; padding: 8px">Actor</th>
+          <th style="text-align: left; padding: 8px">Event</th>
+          <th style="text-align: left; padding: 8px">Decision</th>
+          <th style="text-align: left; padding: 8px">Payload</th>
+          <th style="text-align: left; padding: 8px">Correlation</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% if entries %}
+        {% for entry in entries %}
+        <tr>
+          <td style="padding: 8px; color: #9fb2d0">{{ entry.occurred_at }}</td>
+          <td style="padding: 8px">{{ entry.actor }}</td>
+          <td style="padding: 8px">{{ entry.event_type }}</td>
+          <td style="padding: 8px">{{ entry.decision }}</td>
+          <td style="padding: 8px; color: #9fb2d0">{{ entry.payload }}</td>
+          <td style="padding: 8px; color: #9fb2d0">{{ entry.correlation_id }}</td>
+        </tr>
+        {% endfor %}
+        {% else %}
+        <tr>
+          <td colspan="6" style="padding: 8px; color: #9fb2d0">No audit entries yet.</td>
+        </tr>
+        {% endif %}
+      </tbody>
+    </table>
+  </div>
+</div>

web/templates/partials/controls.html

@@ -17,6 +17,22 @@
       <div class="meta">Max trade capital: {{ max_trade_capital_usd }}</div>
       <div class="meta">Max concurrent trades: {{ max_concurrent_trades }}</div>
     </article>
+    <article class="card">
+      <div class="label">Alerting</div>
+      <div class="meta">Status: {{ alerts_enabled }}</div>
+      <div class="meta">Channels: {{ alerts_channels }}</div>
+      <div class="meta">Min severity: {{ alerts_min_severity }}</div>
+      <div class="meta">Dedup window: {{ alerts_dedup_seconds }}s</div>
+      <div class="meta">Last result: {{ alerts_last_result }}</div>
+      <div class="meta">Last attempted: {{ alerts_last_attempted_at }}</div>
+      <div class="meta">Last success: {{ alerts_last_success_at }}</div>
+      <div class="meta">Last event: {{ alerts_last_event_title }}</div>
+      <div class="meta">Last error: {{ alerts_last_error }}</div>
+      {% if alerts_last_channel_results %} {% for item in
+      alerts_last_channel_results %}
+      <div class="meta">{{ item }}</div>
+      {% endfor %} {% endif %}
+    </article>
   </div>
 
   <div