diff --git a/src/cthulhu/event_manager.py b/src/cthulhu/event_manager.py
index d1be833..321690a 100644
--- a/src/cthulhu/event_manager.py
+++ b/src/cthulhu/event_manager.py
@@ -102,7 +102,7 @@ class EventManager:
         self._churnSuppressed: bool = cthulhu_state.pauseAtspiChurn
         self._prioritizedContextToken: Optional[str] = cthulhu_state.prioritizedDesktopContextToken
         self._relevanceBurstWindow: float = 0.15
-        self._relevanceBurstHistory: Dict[Tuple[str, str], float] = {}
+        self._relevanceBurstHistory: Dict[Tuple[str, str, str], float] = {}
 
         cthulhu_state.device = None
         self._keyHandlingActive: bool = False
@@ -238,14 +238,14 @@ class EventManager:
         return self._isLiveOrNotificationEvent(event)
 
     def _isLiveOrNotificationObject(self, obj: Any) -> bool:
-        if obj is None:
+        if obj is None or isinstance(obj, (str, bytes, int, float, bool)):
             return False
 
         try:
             if AXUtilities.is_notification(obj) or AXUtilities.is_alert(obj):
                 return True
         except Exception:
-            return False
+            pass
 
         try:
             liveAttr = AXObject.get_attribute(obj, 'live')
@@ -329,14 +329,11 @@ class EventManager:
         return None
 
     def _classifyRelevance(self, event: Atspi.Event, app: Atspi.Accessible) -> str:
-        if self._is_obsolete_by_context(event):
-            return self.RELEVANCE_DROP
-
         if self._shouldPreserveForRelevanceGate(event):
             return self.RELEVANCE_KEEP
 
         if event.type.startswith("object:state-changed:focused"):
-            return self.RELEVANCE_KEEP if event.detail1 else self.RELEVANCE_DROP
+            return self.RELEVANCE_KEEP
 
         role = self._eventRoleForRelevance(event)
         eventGroup = self._relevanceEventGroup(event, role)
@@ -374,7 +371,12 @@ class EventManager:
             return False
 
         appName = self._appNameForRelevance(app) or "unknown-app"
-        burstKey = (appName, eventGroup)
+        try:
+            contextKey = self._context_token_for_event(event)
+        except Exception:
+            contextKey = None
+        contextKey = contextKey or f"source:{id(event.source)}"
+        burstKey = (appName, eventGroup, contextKey)
         now = time.monotonic()
         lastSeen = self._relevanceBurstHistory.get(burstKey)
         self._relevanceBurstHistory[burstKey] = now
@@ -468,6 +470,12 @@ class EventManager:
                 else:
                     return _ignore_with_reason("inactive-app", "event not from active app")
 
+        relevance = self._classifyRelevance(event, app)
+        if relevance == self.RELEVANCE_DROP:
+            return _ignore_with_reason("event-relevance-drop", "event is background churn")
+        if relevance == self.RELEVANCE_COLLAPSE:
+            return _ignore_with_reason("event-relevance-collapse", "event was collapsed by relevance gate")
+
         if self._isSteamBurstChurnEvent(event, app):
             return _ignore_with_reason("steam-burst-churn", "event is low-value Steam churn")