first commit

app/db/__init__.py

@@ -0,0 +1,4 @@
+from app.db.base import Base
+from app.db.session import get_session_factory, init_engine
+
+__all__ = ("Base", "get_session_factory", "init_engine")

app/db/base.py

@@ -0,0 +1,5 @@
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass

app/db/session.py

@@ -0,0 +1,23 @@
+from sqlalchemy.ext.asyncio import (
+    AsyncEngine,
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+
+
+def init_engine(database_url: str) -> AsyncEngine:
+    return create_async_engine(
+        database_url,
+        echo=False,
+        pool_pre_ping=True,
+    )
+
+
+def get_session_factory(engine: AsyncEngine) -> async_sessionmaker[AsyncSession]:
+    return async_sessionmaker(
+        engine,
+        class_=AsyncSession,
+        expire_on_commit=False,
+        autoflush=False,
+    )