first commit

backend/app/db/session.py

@@ -0,0 +1,35 @@
+from typing import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import declarative_base
+
+from app.core.config import settings
+
+engine = create_async_engine(
+    settings.DATABASE_URL,
+    echo=settings.DEBUG if hasattr(settings, "DEBUG") else False,
+)
+
+async_session_factory = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+Base = declarative_base()
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with async_session_factory() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+
+
+async def init_db():
+    import app.models.user  # noqa: F401
+    import app.models.gpu_cluster  # noqa: F401
+    import app.models.task  # noqa: F401
+    import app.models.datasource  # noqa: F401
+
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)