feat: indie status page MVP -- FastAPI + SQLite

- 8 DB models (services, incidents, monitors, subscribers, etc.)
- Full CRUD API for services, incidents, monitors
- Public status page with live data
- Incident detail page with timeline
- API key authentication
- Uptime monitoring scheduler
- 13 tests passing
- TECHNICAL_DESIGN.md with full spec

app/services/uptime.py

@@ -0,0 +1,59 @@
+"""Uptime monitoring service — performs HTTP health checks."""
+
+import time
+from datetime import datetime
+
+import httpx
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.models import Monitor, MonitorResult
+
+
+async def check_monitor(monitor: Monitor, db: AsyncSession) -> MonitorResult:
+    """Perform a single HTTP health check for a monitor and store the result."""
+    start = time.monotonic()
+
+    try:
+        async with httpx.AsyncClient() as client:
+            response = await client.request(
+                method=monitor.method,
+                url=monitor.url,
+                timeout=monitor.timeout_seconds,
+                follow_redirects=True,
+            )
+        elapsed_ms = int((time.monotonic() - start) * 1000)
+
+        if response.status_code == monitor.expected_status:
+            # Check response time threshold for "degraded"
+            status = "up" if elapsed_ms < 5000 else "degraded"
+            result = MonitorResult(
+                monitor_id=monitor.id,
+                status=status,
+                response_time_ms=elapsed_ms,
+                status_code=response.status_code,
+                error_message=None,
+                checked_at=datetime.utcnow(),
+            )
+        else:
+            result = MonitorResult(
+                monitor_id=monitor.id,
+                status="down",
+                response_time_ms=elapsed_ms,
+                status_code=response.status_code,
+                error_message=f"Expected {monitor.expected_status}, got {response.status_code}",
+                checked_at=datetime.utcnow(),
+            )
+    except Exception as exc:
+        elapsed_ms = int((time.monotonic() - start) * 1000)
+        result = MonitorResult(
+            monitor_id=monitor.id,
+            status="down",
+            response_time_ms=elapsed_ms,
+            status_code=None,
+            error_message=str(exc)[:500],
+            checked_at=datetime.utcnow(),
+        )
+
+    db.add(result)
+    await db.flush()
+    return result