(minor) search memoization + context (#2732)

* add markdown blocks to search

* nit

* k

backend/danswer/db/engine.py

@@ -346,6 +346,7 @@ def get_session() -> Generator[Session, None, None]:
         raise HTTPException(status_code=401, detail="User must authenticate")
 
     engine = get_sqlalchemy_engine()
+
     with Session(engine, expire_on_commit=False) as session:
         if MULTI_TENANT:
             if not is_valid_schema_name(tenant_id):