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The "חלץ מטא-דאטה" / "חלץ הלכות" buttons in the UI were returning 404 for any precedent with `source_kind != 'external_upload'`. The original restriction was meant to keep LLM extraction off internal-committee imports (their metadata supposedly came from the case file system), but the same precedent rows can still need re-extraction when ingest produces broken data — e.g. the corrupted `subject_tags` value `['[','"','ה','י',...]` that motivated this change (an early ingest stored a JSON literal into a TEXT[] column, which Postgres split into single chars). Two changes here: 1. db.request_metadata_extraction / request_halacha_extraction: drop the `AND source_kind='external_upload'` filter. The extractor already preserves user values (only fills empty fields), so this is safe. 2. precedent_metadata_extractor.extract_and_apply: detect the character-by-character corruption above and treat it as empty so the freshly-extracted tags actually replace the broken ones. Heuristic: 3+ elements where every element is at most 2 chars (legitimate tags are multi-character Hebrew words). Coolify deploy required for the FastAPI container to pick this up.