Initial implementation of Options Sidekick

Full-stack iOS options trading assistant:
- Python FastAPI backend with SQLite, APScheduler (15-min position monitor),
  APNs push notifications, and yfinance market data integration
- Signal engine: IV Rank (rolling HV proxy), SMA-50/200, swing-based
  support/resistance, earnings detection, signal strength scoring and
  noise-resistant SHA hash for change detection
- Recommendation engine: covered call and cash-secured put strike/expiry
  selection across 0DTE, 1DTE, weekly, and monthly horizons
- REST API: /devices, /portfolio, /recommendations, /positions, /signals, /alerts
- iOS SwiftUI app (iOS 17+): dashboard, recommendations, trades, portfolio,
  and alerts tabs with push notification deep-linking
- Unit + integration tests for signal engine and API layer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/scheduler.py

@@ -0,0 +1,38 @@
+"""
+scheduler.py — APScheduler configuration.
+
+The scheduler is started in main.py's lifespan event.
+"""
+
+import asyncio
+import logging
+
+from apscheduler.schedulers.asyncio import AsyncIOScheduler
+from apscheduler.triggers.interval import IntervalTrigger
+
+from app.config import settings
+
+logger = logging.getLogger(__name__)
+
+scheduler = AsyncIOScheduler()
+
+
+def start_scheduler():
+    from app.services.position_monitor import monitor_all_positions
+
+    scheduler.add_job(
+        monitor_all_positions,
+        trigger=IntervalTrigger(seconds=settings.monitor_interval_seconds),
+        id="position_monitor",
+        name="Position Monitor",
+        replace_existing=True,
+        misfire_grace_time=60,
+    )
+    scheduler.start()
+    logger.info(f"Scheduler started — monitor interval: {settings.monitor_interval_seconds}s")
+
+
+def stop_scheduler():
+    if scheduler.running:
+        scheduler.shutdown(wait=False)
+        logger.info("Scheduler stopped")