A mirrored Shows library whose items have no genres stored `genres` as JSON
`null` — SQLAlchemy's JSONB persists a Python None as a JSON scalar, not SQL
NULL. /facets unnested it with jsonb_array_elements_text(), which raises
"cannot extract elements from a scalar", so a single bare library 500'd the
whole Plex module on open (the grid loads, the filter sidebar's facets call dies).
- Guard the /facets genre unnest with jsonb_typeof(genres)='array', mirroring
the guard people.py already applies to the same columns.
- Persist the JSONB tag columns (genres/directors/cast_names/collection_keys on
plex_items and plex_shows) with none_as_null=True, so an empty list round-trips
as SQL NULL and self-heals on the next sync — closing the trap for any future
unnest.
Verified against the real prod row (DumaTV show, genres = JSON null): the
unguarded query errors, the guarded one returns cleanly.
peter
58f836bcd8