init

backend/app/db/base.py

@@ -0,0 +1,39 @@
+from collections.abc import Generator
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
+
+from app.config import get_settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def _ensure_sqlite_dir(database_url: str) -> None:
+    if database_url.startswith("sqlite:///"):
+        db_path = database_url.replace("sqlite:///", "", 1)
+        Path(db_path).parent.mkdir(parents=True, exist_ok=True)
+
+
+settings = get_settings()
+_ensure_sqlite_dir(settings.database_url)
+
+connect_args = {"check_same_thread": False} if settings.database_url.startswith("sqlite") else {}
+engine = create_engine(settings.database_url, connect_args=connect_args)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def init_db() -> None:
+    from app.db import models  # noqa: F401
+
+    Base.metadata.create_all(bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()