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CMRT 29 - TEST - #40

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Swarnadip-Kar wants to merge 79 commits into
gsoc-cmrtfrom
temp-cmrt-fixup-threshold-reanalyze-timestamp-test
Draft

CMRT 29 - TEST#40
Swarnadip-Kar wants to merge 79 commits into
gsoc-cmrtfrom
temp-cmrt-fixup-threshold-reanalyze-timestamp-test

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@Swarnadip-Kar

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To test CMRT 29 with all the fixes
Can reanalyze
Clearing Db not required to delete cache
Thus CMRT grouping can be tested better
Also Grouping Threshold added a Library Preference Key -
editable from the UI -> Makes Testing Grouping Pipeline easier.

Adds schema revision 41 to extend the library table with
MusicBrainz and AcoustID metadata fields required for
Chromaprint-based lookup workflows.

New columns:
- musicbrainz_recording_id
- musicbrainz_release_id
- musicbrainz_track_id
- musicbrainz_artist_id
- acoustid_id
- acoustid_lookup_at
- acoustid_lookup_status

Also adds indexes for MusicBrainz and AcoustID lookup paths.

The revision is backwards-compatible and does not modify
existing user data.
Adds schema revision 42 extending track_analysis with a
TEXT payload column intended for small metadata blobs such
as audio quality metrics and Chromaprint version metadata.

Raw fingerprint arrays are intentionally not stored in
the database.

Also adds a composite lookup index on (track_id, type).
Adds schema revision 43 introducing database tables for
Chromaprint fingerprint grouping, CMRT membership,
AcoustID queue management, and AcoustID response caching.

New tables:
- fingerprint_metadata
- cmrt_groups
- cmrt_members
- acoustid_queue
- acoustid_cache

Design notes:
- fingerprint_hash is a non-unique SimHash pre-filter
- chroma_sha256 is used as the canonical integrity key
- raw fingerprint arrays are not stored in SQLite
- ON DELETE CASCADE is intentionally omitted

Also adds supporting indexes and bumps
kRequiredSchemaVersion from 42 to 43.
This commit implements reading, writing, and deleting `.chroma`
binary files directly to disk, avoiding BLOBs in the SQLite database.
It also wires TrackFingerprintDao into the broader DAO ecosystem
and adds file cleanup cascades into the central track purging logic.

Changes:
- trackfingerprintdao.h/cpp: Accept UserSettingsPointer to manage
  paths privately in ~/.mixxx/fingerprints/ and add save/load/delete.
  saveChromaFile uses a write-temp-then-rename pattern.
- trackdao.h/cpp: Add TrackFingerprintDao dependency and loop over
  purged tracks in onPurgingTracks() to call deleteChromaFile().
- trackcollection.cpp: Initialize m_trackFingerprintDao with pConfig
  and pass to m_trackDao.
- libraryscanner.h/cpp: Add TrackFingerprintDao member to satisfy
  the updated TrackDAO constructor dependency during background scans.
Integrate AnalyzerChromaprint into AnalyzerThread and
register analyzerchromaprint sources in CMakeLists.txt.
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