diff --git a/app/workers/contract_check.py b/app/workers/contract_check.py
index dc733b1..7526cbe 100644
--- a/app/workers/contract_check.py
+++ b/app/workers/contract_check.py
@@ -82,7 +82,7 @@ def _truncate_sample(payload: Any) -> dict[str, Any] | None:
 
 async def _check_token(client: TracksolidClient, *, parser_version: str) -> None:
     try:
-        await client._ensure_token()  # noqa: SLF001 — intentional probe
+        await client._ensure_token()  # intentional probe of the token endpoint
     except (TracksolidError, httpx.HTTPError) as exc:
         await _record(
             endpoint=TOKEN_METHOD,
diff --git a/pyproject.toml b/pyproject.toml
index 55a9334..29ea1fe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,9 @@ ignore = ["PLR0913", "PLR2004"]
 
 [tool.ruff.lint.per-file-ignores]
 "tests/*" = ["PLR0913", "PLR2004"]
+# One-off operational/analysis scripts: allow the long, branchy simulation
+# routines that mirror the SQL trip state machine.
+"scripts/*" = ["PLR0912", "PLR0915"]
 
 [tool.mypy]
 python_version = "3.12"
diff --git a/scripts/simulate_trips_from_legacy.py b/scripts/simulate_trips_from_legacy.py
index 3e774b5..adcaddc 100644
--- a/scripts/simulate_trips_from_legacy.py
+++ b/scripts/simulate_trips_from_legacy.py
@@ -19,8 +19,8 @@ from __future__ import annotations
 import json
 import math
 import sys
-from collections import Counter, defaultdict
-from dataclasses import dataclass, field
+from collections import defaultdict
+from dataclasses import dataclass
 from datetime import datetime, timedelta
 from typing import Any
 
@@ -205,19 +205,20 @@ def legacy_summary(rows: list[dict[str, Any]]) -> dict[str, Any]:
 
 
 def main(path: str) -> None:
-    rows = json.load(open(path))
+    with open(path) as f:
+        rows = json.load(f)
     print(f"\n=== {path} ===")
     print(f"raw rows: {len(rows)}")
 
     leg = legacy_summary(rows)
-    print(f"\n-- LEGACY --")
+    print("\n-- LEGACY --")
     print(f"trips: {len(leg['trips'])}  (plus {leg['n_stationary_rows']} stationary-bucket rows)")
     for tid, t0, t1, n in leg["trips"]:
         dur = (t1 - t0).total_seconds() / 60
         print(f"  trip {tid}: {t0:%H:%M:%S} → {t1:%H:%M:%S}  ({dur:.0f} min, {n} fixes)")
 
     sim = simulate(rows)
-    print(f"\n-- NEW ALGO (5min stop, 30min gap, 5 km/h stationary) --")
+    print("\n-- NEW ALGO (5min stop, 30min gap, 5 km/h stationary) --")
     rep = sim["reporting_time"]
     print(f"reporting_time: {rep.isoformat() if rep else 'none'}")
     print(f"day totals: distance={sim['total_distance_km']} km, "