Add more Ruff rules (#891)

* ruff: apply rule F

* ruff: apply rule E

* ruff: apply rule SIM

* ruff: apply rule TCH

* ruff: apply rule ERA

* ruff: apply rule PLW

* ruff: apply rule FLY

* ruff: apply rule PERF

* ruff: apply rules FURB & RUF

counter/signals.py

@@ -51,7 +51,7 @@ def write_log(instance, operation_type):
         # Return None by default
         return None
 
-    log = OperationLog(
+    OperationLog(
         label=str(instance),
         operator=get_user(),
         operation_type=operation_type,