Improve Face Library Management (#17213)

* Set maximum number of face images to be kept

* Fix vertical camera scaling

* adjust wording

* Add attributes to search data

* Add button to train face from event

* Handle event id saving in API

frigate/data_processing/real_time/face.py

@@ -28,6 +28,7 @@ logger = logging.getLogger(__name__)
 
 
 MAX_DETECTION_HEIGHT = 1080
+MAX_FACE_ATTEMPTS = 100
 MIN_MATCHING_FACES = 2
 
 
@@ -482,6 +483,16 @@ class FaceRealTimeProcessor(RealTimeProcessorApi):
                 )
                 shutil.move(current_file, new_file)
 
+                files = sorted(
+                    os.listdir(folder),
+                    key=lambda f: os.path.getctime(os.path.join(folder, f)),
+                    reverse=True,
+                )
+
+                # delete oldest face image if maximum is reached
+                if len(files) > MAX_FACE_ATTEMPTS:
+                    os.unlink(os.path.join(folder, files[-1]))
+
     def expire_object(self, object_id: str):
         if object_id in self.detected_faces:
             self.detected_faces.pop(object_id)