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/scheduler.py

@@ -0,0 +1,59 @@
+"""Background scheduler for uptime monitoring using APScheduler."""
+
+import asyncio
+import logging
+from datetime import datetime
+
+from apscheduler.schedulers.asyncio import AsyncIOScheduler
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database import async_session_factory
+from app.models.models import Monitor
+from app.services.uptime import check_monitor
+
+logger = logging.getLogger(__name__)
+
+_scheduler: AsyncIOScheduler | None = None
+
+
+async def _run_monitor_checks() -> None:
+    """Check all active monitors."""
+    async with async_session_factory() as db:
+        result = await db.execute(select(Monitor).where(Monitor.is_active == True))  # noqa: E712
+        monitors = result.scalars().all()
+
+        for monitor in monitors:
+            try:
+                await check_monitor(monitor, db)
+            except Exception as exc:
+                logger.error(f"Monitor check failed for {monitor.url}: {exc}")
+
+        await db.commit()
+
+
+def start_scheduler() -> None:
+    """Start the APScheduler with periodic monitor checks."""
+    global _scheduler
+    if _scheduler is not None:
+        return
+
+    _scheduler = AsyncIOScheduler()
+    _scheduler.add_job(
+        _run_monitor_checks,
+        "interval",
+        seconds=60,
+        id="monitor_checks",
+        replace_existing=True,
+    )
+    _scheduler.start()
+    logger.info("Uptime monitoring scheduler started (interval: 60s)")
+
+
+def shutdown_scheduler() -> None:
+    """Gracefully shut down the scheduler."""
+    global _scheduler
+    if _scheduler is not None:
+        _scheduler.shutdown(wait=False)
+        _scheduler = None
+        logger.info("Uptime monitoring scheduler stopped")