Investigate Lagoon park to ensure location_id is populated after the backfill. The backfill path was executed but Lagoon still shows location_id as NULL, indicating the backfill did not apply correctly. This commit documents the follow-up checks and intention to adjust the backfill/association logic (joining via slug rather than park_id and ensuring name/display_name are populated) to correctly link Lagoon to its location. No frontend changes.
