Initial commit: KiraTV IPTV proxy server

Full-stack IPTV management system with Xtream Codes API compatibility,
multi-account provider fan-out, Jellyfin local library integration,
real-time dashboard, EPG support, and A/V-sync-safe stream recovery.

backend/database.py

@@ -0,0 +1,31 @@
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from .config import settings
+
+engine = create_async_engine(
+    settings.database_url,
+    echo=False,
+    pool_size=20,
+    max_overflow=10,
+    pool_pre_ping=True,
+)
+
+AsyncSessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db():
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+        finally:
+            await session.close()
+
+
+async def init_db():
+    from .models import provider, channel, user, epg, custom_category, log, notification, jellyfin  # noqa: ensure all models imported
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)