fix: add missing sqlalchemy imports (select, text, delete, update) to main.py

app/main.py

@@ -12,6 +12,7 @@ from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 from markupsafe import Markup, escape
 from sqlalchemy import select
+from sqlalchemy import delete, select, text, update
 from sqlalchemy.orm import Session
 from starlette.responses import HTMLResponse as _HR