======================== unified (from filesystem) ========================
                                         'bitrate'  '160.003'
                                        'duration'  '351'
                                          'artist'  'The Dresden Dolls'
                                     'text_people'  ''
                                         'release'  'The Dresden Dolls'
                                           'title'  'Good Day'
                                           'quals'  "['q-bass-2', 'q-drums-3', 'q-other-2', 'q-piano-2', 'q-vocals-3']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '143.5'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:eng'                            'ogg had 160 kbps 44100 Hz'
'TALB' (Album/Movie/Show title)                     'The Dresden Dolls'
'TBPM' (BPM (beats per minute))                     '143.5'
'TIT2' (Title/songname/content description)         'Good Day'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Dresden Dolls'
'TRCK' (Track number/Position in set)               '1'
'TXXX:q-bass'                                       '2'
'TXXX:q-drums'                                      '3'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '2'
'TXXX:q-vocals'                                     '3'

========================== row from database ==========================
                                              'id'  1538066
                                            'path'  /data/Music/Other/PrevSet/[0yay1]/Dresden Dolls/Good Day.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  351
                                           'genre'  
                                        'filesize'  7031834
                                           'mtime'  1662800186
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [0yay1]
                                      'tag_artist'  The Dresden Dolls
                                     'tag_release'  The Dresden Dolls
                                       'tag_title'  Good Day
                                             'bpm'  143.5
                                    'search_title'  'day':2 'good':1
                                   'search_artist'  'dolls':3 'dresden':2 'the':1
                                  'search_release'  'dolls':3 'dresden':2 'the':1
                                     'search_rest'  '0yay1':2,3 'prev':4 'prevset':1 'set':5
                                    'search_combo'  '0yay1':10,11 'day':2A 'dolls':5B,8C 'dresden':4B,7C 'good':1A 'prev':12 'prevset':9 'set':13 'the':3B,6C
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['q-bass-2', 'q-drums-3', 'q-other-2', 'q-piano-2', 'q-vocals-3']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800185.788617  (2022-09-10 10:56:25)
                             'size'  7031834