Update project files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/database.py

@@ -20,3 +20,14 @@ def get_db():
         yield db
     finally:
         db.close()
+
+
+def switch_database(db_path: Path):
+    """Hot-swap the active database engine and session factory."""
+    global engine, SessionLocal, DB_PATH
+    DB_PATH = db_path
+    engine.dispose()
+    engine = create_engine(f"sqlite:///{db_path}", echo=False)
+    SessionLocal = sessionmaker(bind=engine, class_=Session, expire_on_commit=False)
+    Base.metadata.create_all(bind=engine)
+    return engine