-- Upgrades (M502 #5524): a held album whose copy is below the quality the
-- operator settles for, or that holds a video rip, stays wanted for a better
-- copy. The import replaces the old tracks with the new ones.
--
--   acquisition_settings.upgrade_until  the tier a held album is upgraded to;
--                                       '' switches quality upgrades off.
--                                       Lidarr's "Any" profile upgraded up to
--                                       High Quality Lossy (note #5527).
--   wants.upgrade                       why a held album is wanted again:
--                                       quality (below upgrade_until) or rip
--                                       (a track is a video rip); '' not.
--   wants.held_tier, held_quality       the library copy's tier, estimated
--                                       from format and size per second, and
--                                       the same in words.
--   wants.upgrade_checked_at            when the wanted worker last judged it.
--   want_candidates.verdict             unchanged: a release no better than
--                                       the copy held is "refused".
ALTER TABLE acquisition_settings
    ADD COLUMN upgrade_until text NOT NULL DEFAULT 'lossy_high';

ALTER TABLE wants
    ADD COLUMN upgrade            text NOT NULL DEFAULT ''
        CONSTRAINT wants_upgrade_check CHECK (upgrade IN ('', 'quality', 'rip')),
    ADD COLUMN held_tier          text NOT NULL DEFAULT '',
    ADD COLUMN held_quality       text NOT NULL DEFAULT '',
    ADD COLUMN upgrade_checked_at timestamptz;

CREATE INDEX wants_upgrade_idx ON wants (searched_at NULLS FIRST)
    WHERE fulfilled_at IS NOT NULL AND upgrade <> '';