Init first files

backend/app/core/db.py

@@ -0,0 +1,18 @@
+from collections.abc import AsyncGenerator
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+from app.core.config import get_settings
+
+settings = get_settings()
+
+engine = create_async_engine(settings.database_url, future=True, pool_pre_ping=True)
+SessionLocal = async_sessionmaker(bind=engine, expire_on_commit=False, class_=AsyncSession)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with SessionLocal() as session:
+        yield session