Only consider events that haven't already been processed

alerts/geomodel/alert.py

@@ -69,7 +69,13 @@ def alert(
     '''
 
     relevant_es = sorted(from_es, key=attrgetter('lastaction'), reverse=True)[0:1]
-    all_evts = sorted(from_evts, key=attrgetter('lastaction'))
+    if len(relevant_es) == 0:
+        all_evts = from_evts
+    else:
+        all_evts = list(filter(
+            lambda loc: loc.lastaction > relevant_es[0].lastaction,
+            from_evts))
+    all_evts = sorted(all_evts, key=attrgetter('lastaction'))
     locs_to_consider = relevant_es + all_evts
 
     if len(locs_to_consider) < 2: