first commit

backend/app/db/__init__.py

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+from app.db.base import Base
+from app.db.session import SessionLocal, engine, get_db
+
+__all__ = ["Base", "SessionLocal", "engine", "get_db"]

backend/app/db/base.py

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+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass

backend/app/db/session.py

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+from collections.abc import Generator
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.core.config import get_settings
+
+settings = get_settings()
+
+engine = create_engine(
+    settings.database_url,
+    pool_pre_ping=True,
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()