Classification fixes (#20771)

* Fully delete a model

* Fix deletion dialog

* Fix classification back step

* Adjust selection gradient

* Fix

* Fix

frigate/api/classification.py

@@ -31,13 +31,15 @@ from frigate.api.defs.response.generic_response import GenericResponse
 from frigate.api.defs.tags import Tags
 from frigate.config import FrigateConfig
 from frigate.config.camera import DetectConfig
-from frigate.const import CLIPS_DIR, FACE_DIR
+from frigate.const import CLIPS_DIR, FACE_DIR, MODEL_CACHE_DIR
 from frigate.embeddings import EmbeddingsContext
 from frigate.models import Event
+from frigate.util.builtin import update_yaml_file_bulk
 from frigate.util.classification import (
     collect_object_classification_examples,
     collect_state_classification_examples,
 )
+from frigate.util.config import find_config_file
 from frigate.util.path import get_event_snapshot
 
 logger = logging.getLogger(__name__)
@@ -828,12 +830,34 @@ def delete_classification_model(request: Request, name: str):
             status_code=404,
         )
 
-    # Delete the classification model's data directory
-    model_dir = os.path.join(CLIPS_DIR, sanitize_filename(name))
+    # Delete the classification model's data directory in clips
+    data_dir = os.path.join(CLIPS_DIR, sanitize_filename(name))
+    if os.path.exists(data_dir):
+        shutil.rmtree(data_dir)
 
+    # Delete the classification model's files in model_cache
+    model_dir = os.path.join(MODEL_CACHE_DIR, sanitize_filename(name))
     if os.path.exists(model_dir):
         shutil.rmtree(model_dir)
 
+    # Remove the model from the config file
+    config_file = find_config_file()
+    try:
+        # Setting value to empty string deletes the key
+        updates = {f"classification.custom.{name}": None}
+        update_yaml_file_bulk(config_file, updates)
+    except Exception as e:
+        logger.error(f"Error updating config file: {e}")
+        return JSONResponse(
+            content=(
+                {
+                    "success": False,
+                    "message": "Failed to update config file.",
+                }
+            ),
+            status_code=500,
+        )
+
     return JSONResponse(
         content=(
             {