feat: a held album below the quality you settle for, or holding a video rip, stays wanted for a better copy, and the import replaces the old tracks with their likes and plays carried over (M502 #5524)

- acquisition_settings.upgrade_until (default High quality lossy, Lidarr's
  cutoff, note #5527; "" is off), an "Upgrade until" row under Searching.
- The wanted worker judges held albums hourly: tier per format from size per
  second (the scanner records no bitrate), the album's worst. Below the
  cutoff it is wanted for quality; a video rip among its tracks always.
- The schedule searches upgrades weekly, after open wants; a release no
  better than the copy held is refused ("not_better").
- The import matches each file to the track it would replace (recording,
  then disc/track) and replaces it when it is a rip or the file is a better
  tier: over the same path in one rename, or filed beside it and the old
  track folded in (library.ReplaceTrack: file first, then foldTrackInto).
  Nothing better: the release is set aside.
- Collection › Upgrades (Lidarr's Cutoff Unmet); Suspect sources says when a
  clean copy was looked for instead of Lidarr's search.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/queries/imports.sql

@@ -140,3 +140,26 @@ SELECT b.info_hash, b.name, b.reason, b.detail, b.blocked_at, b.expires_at, w.ti
  WHERE b.expires_at IS NULL OR b.expires_at > now()
  ORDER BY b.blocked_at DESC, b.info_hash
  LIMIT sqlc.arg(max_rows) OFFSET sqlc.arg(skip);
+
+-- name: ListUpgradeTracks :many
+-- The tracks an upgrade may replace (#5524): the present tracks of the album
+-- the want holds.
+SELECT id, file_path, mbid, COALESCE(disc_number, 1)::int AS disc, track_number,
+       file_format, file_size, duration_ms, source_verdict
+  FROM tracks
+ WHERE album_id = $1 AND missing_since IS NULL;
+
+-- name: FinishUpgrade :exec
+-- An upgrade was imported: the want holds the album the new tracks are in,
+-- and is judged again by the next upgrade check.
+UPDATE wants
+   SET album_id           = COALESCE(sqlc.narg(album_id), album_id),
+       upgrade            = '',
+       upgrade_checked_at = NULL,
+       updated_at         = now()
+ WHERE id = sqlc.arg(id);
+
+-- name: ClearTrackSourceVerdict :exec
+-- A track whose file was replaced in place is no longer the rip it was.
+UPDATE tracks SET source_verdict = NULL, source_verdict_at = NULL
+ WHERE id = $1 AND source_verdict = 'suspect';