-- Each user's loudness-normalization preference (M464 #4998). It is kept on
-- the server, not per device, so the web player, the Android app and the
-- leveled stream for UPnP/Sonos all apply the same one.
--
-- mode:   off, auto (album gain while an album plays in order, otherwise
--         track gain), track or album.
-- target: the loudness tracks are leveled to, in LUFS.
-- boost:  headroom raises quiet tracks only as far as their true peak
--         allows; limiter raises them all the way and limits the peaks.
--
-- No row means the defaults, which are the column defaults here and
-- library.DefaultNormalizationPrefs in Go (a test holds them equal).
CREATE TABLE user_normalization_prefs (
    user_id     uuid PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
    mode        text NOT NULL DEFAULT 'auto'
                CHECK (mode IN ('off', 'auto', 'track', 'album')),
    target_lufs smallint NOT NULL DEFAULT -18
                CHECK (target_lufs IN (-18, -16, -14)),
    boost       text NOT NULL DEFAULT 'headroom'
                CHECK (boost IN ('headroom', 'limiter')),
    updated_at  timestamptz NOT NULL DEFAULT now()
);