style: apply ruff formatting to all backend files

backend/models/event_model.py

@@ -75,10 +75,7 @@ def _target_types(targets: list) -> list:
     types = []
     for t in targets or []:
         resolved = t.get("_resolved") or {}
-        t_type = (
-            resolved.get("type")
-            or t.get("type")
-        )
+        t_type = resolved.get("type") or t.get("type")
         if t_type:
             types.append(t_type)
     return types
@@ -101,7 +98,9 @@ def _display_summary(operation: str, target_labels: list, actor_label: str, targ
     return " | ".join(pieces)
 
 
-def _render_summary(template: str, operation: str, actor: str, target: str, category: str, result: str, service: str) -> str:
+def _render_summary(
+    template: str, operation: str, actor: str, target: str, category: str, result: str, service: str
+) -> str:
     try:
         return template.format(
             operation=operation or category or "Event",
@@ -177,13 +176,16 @@ def normalize_event(e):
     else:
         display_actor_value = actor_label
 
-    dedupe_key = _make_dedupe_key(e, {
-        "id": e.get("id"),
-        "timestamp": e.get("activityDateTime"),
-        "service": e.get("category"),
-        "operation": e.get("activityDisplayName"),
-        "target_displays": target_labels,
-    })
+    dedupe_key = _make_dedupe_key(
+        e,
+        {
+            "id": e.get("id"),
+            "timestamp": e.get("activityDateTime"),
+            "service": e.get("category"),
+            "operation": e.get("activityDisplayName"),
+            "target_displays": target_labels,
+        },
+    )
 
     return {
         "id": e.get("id"),