init

backend/app/database.py

@@ -0,0 +1,27 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from .config import get_settings
+
+settings = get_settings()
+
+# Convert postgresql:// to postgresql+asyncpg://
+database_url = settings.database_url.replace("postgresql://", "postgresql+asyncpg://")
+
+engine = create_async_engine(database_url, echo=False)
+async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db():
+    async with async_session() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()