only fire one SSE per update to an Incident

See this issue for more context:
#1369

src/ims/store/_db.py

@@ -831,7 +831,6 @@ def _attachRangeHandlesToIncident(
         self._log.info(
             "Attached Rangers {rangerHandles} to incident "
             "{eventID}#{incidentNumber}",
-            storeWriteClass=Incident,
             eventID=eventID,
             incidentNumber=incidentNumber,
             rangerHandles=rangerHandles,
@@ -859,7 +858,6 @@ def _attachIncidentTypesToIncident(
         self._log.info(
             "Attached incident types {incidentTypes} to incident "
             "{eventID}#{incidentNumber}",
-            storeWriteClass=Incident,
             eventID=eventID,
             incidentNumber=incidentNumber,
             incidentTypes=incidentTypes,
@@ -884,6 +882,19 @@ def _createReportEntry(
             reportEntry=reportEntry,
         )
 
+    def _notifyIncidentUpdate(
+        self,
+        eventID: str,
+        incidentNumber: int,
+    ) -> None:
+        # This will trigger the DataStoreEventSourceLogObserver
+        self._log.info(
+            "Firing incident update event for {eventID}#{incidentNumber}",
+            storeWriteClass=Incident,
+            eventID=eventID,
+            incidentNumber=incidentNumber,
+        )
+
     def _createAndAttachReportEntriesToIncident(
         self,
         eventID: str,
@@ -909,7 +920,6 @@ def _createAndAttachReportEntriesToIncident(
         self._log.info(
             "Attached report entries to incident {eventID}#{incidentNumber}: "
             "{reportEntries}",
-            storeWriteClass=Incident,
             eventID=eventID,
             incidentNumber=incidentNumber,
             reportEntries=reportEntries,
@@ -1082,10 +1092,11 @@ def createIncident(
 
         self._log.info(
             "Created incident {incident}",
-            storeWriteClass=Incident,
             incident=incident,
         )
 
+        self._notifyIncidentUpdate(incident.eventID, incident.number)
+
         return incident
 
     async def createIncident(self, incident: Incident, author: str) -> Incident:
@@ -1148,7 +1159,6 @@ def setIncidentAttribute(txn: Transaction) -> None:
         self._log.info(
             "{author} updated incident {eventID}#{incidentNumber}: "
             "{attribute}={value}",
-            storeWriteClass=Incident,
             query=query,
             eventID=eventID,
             incidentNumber=incidentNumber,
@@ -1157,6 +1167,8 @@ def setIncidentAttribute(txn: Transaction) -> None:
             author=author,
         )
 
+        self._notifyIncidentUpdate(eventID, incidentNumber)
+
     async def setIncident_priority(
         self,
         eventID: str,
@@ -1336,13 +1348,14 @@ def setIncident_rangers(txn: Transaction) -> None:
         self._log.info(
             "{author} set Rangers for incident {eventID}#{incidentNumber}: "
             "{rangerHandles}",
-            storeWriteClass=Incident,
             author=author,
             eventID=eventID,
             incidentNumber=incidentNumber,
             rangerHandles=rangerHandles,
         )
 
+        self._notifyIncidentUpdate(eventID, incidentNumber)
+
     async def setIncident_incidentTypes(
         self,
         eventID: str,
@@ -1395,13 +1408,14 @@ def setIncident_incidentTypes(txn: Transaction) -> None:
         self._log.info(
             "{author} set incident types for incident "
             "{eventID}#{incidentNumber}: {incidentTypes}",
-            storeWriteClass=Incident,
             author=author,
             eventID=eventID,
             incidentNumber=incidentNumber,
             incidentTypes=incidentTypes,
         )
 
+        self._notifyIncidentUpdate(eventID, incidentNumber)
+
     async def addReportEntriesToIncident(
         self,
         eventID: str,
@@ -1446,6 +1460,8 @@ def addReportEntriesToIncident(txn: Transaction) -> None:
             )
             raise
 
+        self._notifyIncidentUpdate(eventID, incidentNumber)
+
     ###
     # Incident Reports
     ###