feat: initial commit

backend/app/database.py

@@ -0,0 +1,29 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from app.config import settings
+
+engine = create_async_engine(
+    settings.database_url,
+    echo=False,
+    pool_pre_ping=True,
+    pool_size=10,
+    max_overflow=20,
+)
+
+AsyncSessionLocal = async_sessionmaker(
+    engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db() -> AsyncSession:
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+        finally:
+            await session.close()