Initial commit: Pole Dance Championships App

Full-stack mobile app for pole dance championship management.

Backend: FastAPI + SQLAlchemy 2 (async) + SQLite (dev) / PostgreSQL (prod)
- JWT auth with refresh token rotation
- Championship CRUD with Instagram Graph API sync (APScheduler)
- Registration flow with status management
- Participant list publish with Expo push notifications
- Alembic migrations, pytest test suite

Mobile: React Native + Expo (TypeScript)
- Auth gate: pending approval screen for new members
- Championships list & detail screens
- Registration form with status tracking
- React Query + Zustand + React Navigation v6

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

backend/app/services/notification_service.py

@@ -0,0 +1,44 @@
+import httpx
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.notification_log import NotificationLog
+from app.models.user import User
+
+EXPO_PUSH_URL = "https://exp.host/--/api/v2/push/send"
+
+
+async def send_push_notification(
+    db: AsyncSession,
+    user: User,
+    title: str,
+    body: str,
+    notif_type: str,
+    registration_id: str | None = None,
+) -> None:
+    delivery_status = "skipped"
+
+    if user.expo_push_token:
+        payload = {
+            "to": user.expo_push_token,
+            "title": title,
+            "body": body,
+            "data": {"type": notif_type, "registration_id": registration_id},
+            "sound": "default",
+        }
+        try:
+            async with httpx.AsyncClient(timeout=10.0) as client:
+                response = await client.post(EXPO_PUSH_URL, json=payload)
+            delivery_status = "sent" if response.status_code == 200 else "failed"
+        except Exception:
+            delivery_status = "failed"
+
+    log = NotificationLog(
+        user_id=user.id,
+        registration_id=registration_id,
+        type=notif_type,
+        title=title,
+        body=body,
+        delivery_status=delivery_status,
+    )
+    db.add(log)
+    await db.commit()