fix: ruff findings

src/fenris/status.py

@@ -15,15 +15,14 @@ Criteria: LC-9, CI-2, CI-4, FL-4, FL-5, FL-7.
 """
 import sqlite3
 from contextlib import contextmanager
-import sys
-from datetime import datetime, timedelta, timezone
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any, Dict, Iterator, List, Optional, Tuple, TYPE_CHECKING
 
 if TYPE_CHECKING:
     from .status_composition import StatusComposition
 
-from .projection import compute_projection, ConfidenceState, DISCLOSURES
+from .projection import compute_projection, DISCLOSURES
 from .store import SCHEMA_VERSION
 from .init_system import (
     query_service_state as _init_query_service_state,