Add support for stationary and active timeline entires (#7344)

* Add support for stationary and active timeline entires

* Be sure to update stored event data copy with stationary

frigate/events/maintainer.py

@@ -37,6 +37,14 @@ def should_update_db(prev_event: Event, current_event: Event) -> bool:
     return False
 
 
+def should_update_state(prev_event: Event, current_event: Event) -> bool:
+    """If current event should update state, but not necessarily update the db."""
+    if prev_event["stationary"] != current_event["stationary"]:
+        return True
+
+    return False
+
+
 class EventProcessor(threading.Thread):
     def __init__(
         self,
@@ -107,8 +115,11 @@ class EventProcessor(threading.Thread):
         event_data: Event,
     ) -> None:
         """handle tracked object event updates."""
+        updated_db = False
+
         # if this is the first message, just store it and continue, its not time to insert it in the db
         if should_update_db(self.events_in_process[event_data["id"]], event_data):
+            updated_db = True
             camera_config = self.config.cameras[camera]
             event_config: EventsConfig = camera_config.record.events
             width = camera_config.detect.width
@@ -210,6 +221,10 @@ class EventProcessor(threading.Thread):
                 .execute()
             )
 
+        # check if the stored event_data should be updated
+        if updated_db or should_update_state(
+            self.events_in_process[event_data["id"]], event_data
+        ):
             # update the stored copy for comparison on future update messages
             self.events_in_process[event_data["id"]] = event_data