Allow API Events to be Detections or Alerts, depending on the Event Label (#21923)

* - API created events will be alerts OR detections, depending on the event label, defaulting to alerts
- Indefinite API events will extend the recording segment until those events are ended
- API event start time is the actual start time, instead of having a pre-buffer of record.event_pre_capture

* Instead of checking for indefinite events on a camera before deciding if we should end the segment, only update last_detection_time and last_alert_time if frame_time is greater, which should have the same effect

* Add the ability to set a pre_capture number of seconds when creating a manual event via the API. Default behavior unchanged

* Remove unnecessary _publish_segment_start() call

* Formatting

* handle last_alert_time or last_detection_time being None when checking them against the frame_time

* comment manual_info["label"].split(": ")[0] for clarity

frigate/track/object_processing.py

@@ -515,6 +515,7 @@ class TrackedObjectProcessor(threading.Thread):
             duration,
             source_type,
             draw,
+            pre_capture,
         ) = payload
 
         # save the snapshot image
@@ -522,6 +523,11 @@ class TrackedObjectProcessor(threading.Thread):
             None, event_id, label, draw
         )
         end_time = frame_time + duration if duration is not None else None
+        start_time = (
+            frame_time - self.config.cameras[camera_name].record.event_pre_capture
+            if pre_capture is None
+            else frame_time - pre_capture
+        )
 
         # send event to event maintainer
         self.event_sender.publish(
@@ -536,8 +542,7 @@ class TrackedObjectProcessor(threading.Thread):
                     "sub_label": sub_label,
                     "score": score,
                     "camera": camera_name,
-                    "start_time": frame_time
-                    - self.config.cameras[camera_name].record.event_pre_capture,
+                    "start_time": start_time,
                     "end_time": end_time,
                     "has_clip": self.config.cameras[camera_name].record.enabled
                     and include_recording,