Move datetime to TYPE_CHECKING block

db/data_models/__init__.py

@@ -1,12 +1,15 @@
 from __future__ import annotations
 
 import enum
-from datetime import datetime
+import typing
 
 from sqlalchemy import inspect, Enum, ForeignKey, Table, Column, Integer
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
+if typing.TYPE_CHECKING:
+    from datetime import datetime
+
 
 class State(enum.Enum):
     """

db/utils/db_updater.py

@@ -4,7 +4,7 @@
 from sqlalchemy import NullPool, create_engine
 from sqlalchemy.orm import sessionmaker
 
-from db.data_models import Instrument, Job, Run, Script, State, JobOwner, JobType, run_job_junction_table
+from db.data_models import Instrument, Job, Run, Script, State, JobOwner, JobType
 from db.utils import DatabaseInconsistencyError