-- §9.6: the three fields rich detail keeps out of the database are the ones
-- pure-SQL views need — the in-library half of unified search (§9.2) and the
-- library grid would otherwise cost one TMDB call per row. Nullable, no
-- default: a title added before its first metadata refresh has no artwork
-- yet, and TMDB itself has entries with no poster.
ALTER TABLE movies ADD COLUMN poster_path TEXT;
ALTER TABLE movies ADD COLUMN backdrop_path TEXT;
ALTER TABLE movies ADD COLUMN vote_average REAL;
ALTER TABLE series ADD COLUMN poster_path TEXT;
ALTER TABLE series ADD COLUMN backdrop_path TEXT;
ALTER TABLE series ADD COLUMN vote_average REAL;