Refactor code structure for improved readability and maintainability

app/core/database.py

@@ -0,0 +1,38 @@
+from collections.abc import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
+from sqlmodel import SQLModel
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+from app.core.config import settings
+from app.models import (  # noqa: F401
+    plan,
+    playlist,
+    playlist_sound,
+    sound,
+    sound_played,
+    stream,
+    user,
+    user_oauth,
+)
+
+engine: AsyncEngine = create_async_engine(
+    settings.DATABASE_URL,
+    echo=settings.DATABASE_ECHO,
+)
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with AsyncSession(engine) as session:
+        try:
+            yield session
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+
+async def init_db() -> None:
+    async with engine.begin() as conn:
+        await conn.run_sync(SQLModel.metadata.create_all)