======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '273'
                                          'artist'  'Madonna'
                                     'text_people'  ''
                                         'release'  'Erotica'
                                           'title'  'Erotica'
                                           'quals'  "['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '102.0'
                                             'key'  'E m'  (9A)
                                        'acoustid'  ''
rest: ''

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

'POPM:\x01ÿþ0'                                      POPM(email='\x01ÿþ0', rating=0, count=0)
'TALB' (Album/Movie/Show title)                     'Erotica'
'TBPM' (BPM (beats per minute))                     '102.0'
'TIT2' (Title/songname/content description)         'Erotica'
'TKEY' (Initial key)                                'E m'
'TPE1' (Lead performer(s)/Soloist(s))               'Madonna'
'TRCK' (Track number/Position in set)               '1'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'52118975-53d6-4e7d-a15a-d927ac6334a0\x00')

========================== row from database ==========================
                                              'id'  1538291
                                            'path'  /data/Music/Other/PrevSet/[9amusing]/Madonna - Erotica.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  273
                                           'genre'  
                                        'filesize'  4382720
                                           'mtime'  1657687845
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9amusing]
                                      'tag_artist'  Madonna
                                     'tag_release'  Erotica
                                       'tag_title'  Erotica
                                             'bpm'  102.0
                                    'search_title'  'erotica':1
                                   'search_artist'  'madonna':1
                                  'search_release'  'erotica':1
                                     'search_rest'  '9amusing':2,3 'prev':4 'prevset':1 'set':5
                                    'search_combo'  '9amusing':5,6 'erotica':1A,3C 'madonna':2B 'prev':7 'prevset':4 'set':8
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  E m
                                           'quals'  ['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1657687845.1618698  (2022-07-13 06:50:45)
                             'size'  4382720