first commit

backend/app/models/database.py

@@ -0,0 +1,33 @@
+"""Database session and initialization."""
+
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from app.config import get_settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+engine = None
+async_session_maker = None
+
+
+async def init_db():
+    global engine, async_session_maker
+    settings = get_settings()
+    engine = create_async_engine(
+        settings.database_url,
+        echo=settings.debug,
+    )
+    async_session_maker = async_sessionmaker(
+        engine, class_=AsyncSession, expire_on_commit=False
+    )
+    from app.models import Case, Screenshot, Transaction  # noqa: F401
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+
+async def get_db():
+    async with async_session_maker() as session:
+        yield session