======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '352'
                                          'artist'  'Gregorian'
                                     'text_people'  ''
                                         'release'  'Masters of chant'
                                           'title'  'Losing my religion'
                                           'quals'  "['q-bass-3', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-4']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1999'
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '112.1'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'COMM:ID3v1 Comment:eng'                            'VRX collection'
'TALB' (Album/Movie/Show title)                     'Masters of chant'
'TBPM' (BPM (beats per minute))                     '112.1'
'TDRC' (Recording time)                             '1999'
'TIT2' (Title/songname/content description)         'Losing my religion'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Gregorian'
'TXXX:q-bass'                                       '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '4'

========================== row from database ==========================
                                              'id'  1538266
                                            'path'  /data/Music/Other/PrevSet/[9amusing]/Gregorian/Losing My Religion.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  352
                                           'genre'  
                                        'filesize'  5645418
                                           'mtime'  1662800502
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9amusing] My Religion
                                      'tag_artist'  Gregorian
                                     'tag_release'  Masters of chant
                                       'tag_title'  Losing my religion
                                             'bpm'  112.1
                                    'search_title'  'losing':1 'my':2 'religion':3
                                   'search_artist'  'gregorian':1
                                  'search_release'  'chant':3 'masters':1 'of':2
                                     'search_rest'  '9amusing':2,3 'my':4 'prev':6 'prevset':1 'religion':5 'set':7
                                    'search_combo'  '9amusing':9,10 'chant':7C 'gregorian':4B 'losing':1A 'masters':5C 'my':2A,11 'of':6C 'prev':13 'prevset':8 'religion':3A,12 'set':14
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['q-bass-3', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-4']
                                      'lastfmtags'  []
                                        'tag_date'  1999
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800501.9744096  (2022-09-10 11:01:41)
                             'size'  5645418