style: apply ruff formatting to all backend files

backend/maintenance.py

@@ -6,6 +6,7 @@ new display fields. Example:
 
     python maintenance.py renormalize --limit 500
 """
+
 import argparse
 
 from database import events_collection
@@ -53,7 +54,9 @@ def dedupe(limit: int = None, batch_size: int = 500) -> int:
     """
     Remove duplicate events based on dedupe_key. Keeps the first occurrence encountered.
     """
-    cursor = events_collection.find({}, projection={"_id": 1, "dedupe_key": 1, "raw": 1, "id": 1, "timestamp": 1}).sort("timestamp", 1)
+    cursor = events_collection.find({}, projection={"_id": 1, "dedupe_key": 1, "raw": 1, "id": 1, "timestamp": 1}).sort(
+        "timestamp", 1
+    )
     if limit:
         cursor = cursor.limit(int(limit))