Remove thumb from database field (#16647)

* Remove thumbnail from dict

* Create thumbnail diectory

* Cleanup handling of tracked object images

* Make thumbnail optional

* Handle cases where thumbnail is used

* Expand options for thumbnail api

* Fix up the does not exist condition

* Remove absolute usages of thumbnails

* Write thumbnails for external events

* Reduce webp quality

* Use webp everywhere in frontend

* Formatting

* Always consider all events when re-indexing

* Add thumbnail deletion and cleanup path management

* Cleanup imports

* Rename def

* Don't save thumbnail for every object

* Correct event count

* Use correct function

* Include thumbnail in query

* Remove unused

* Fix requiring exception

frigate/util/path.py

@@ -0,0 +1,51 @@
+"""Path utilities."""
+
+import base64
+import os
+from pathlib import Path
+
+from frigate.const import CLIPS_DIR, THUMB_DIR
+from frigate.models import Event
+
+
+def get_event_thumbnail_bytes(event: Event) -> bytes | None:
+    if event.thumbnail:
+        return base64.b64decode(event.thumbnail)
+    else:
+        try:
+            with open(
+                os.path.join(THUMB_DIR, event.camera, f"{event.id}.webp"), "rb"
+            ) as f:
+                return f.read()
+        except Exception:
+            return None
+
+
+### Deletion
+
+
+def delete_event_images(event: Event) -> bool:
+    return delete_event_snapshot(event) and delete_event_thumbnail(event)
+
+
+def delete_event_snapshot(event: Event) -> bool:
+    media_name = f"{event.camera}-{event.id}"
+    media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}.jpg")
+
+    try:
+        media_path.unlink(missing_ok=True)
+        media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}-clean.png")
+        media_path.unlink(missing_ok=True)
+        return True
+    except OSError:
+        return False
+
+
+def delete_event_thumbnail(event: Event) -> bool:
+    if event.thumbnail:
+        return True
+    else:
+        Path(os.path.join(THUMB_DIR, event.camera, f"{event.id}.webp")).unlink(
+            missing_ok=True
+        )
+        return True