add back type checkers

Author: eakmanrq

sqlmesh/core/config/root.py

@@ -44,7 +44,7 @@
 from sqlmesh.core.user import User
 from sqlmesh.utils.date import to_timestamp, now
 from sqlmesh.utils.errors import ConfigError
-from sqlmesh.utils.pydantic import model_validator, field_validator
+from sqlmesh.utils.pydantic import model_validator
 
 
 def validate_no_past_ttl(v: str) -> str: