======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '238'
                                          'artist'  'Weird Al Yankovic'
                                     'text_people'  ''
                                         'release'  'Even Worse'
                                           'title'  'Melanie'
                                           'quals'  "['q-bass-3', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-4']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '130.0'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=153)
'PRIV:www.mexp.dk:\x01\x08\x00\x00\x00\x00amusing'  PRIV(owner='www.mexp.dk', data=b'\x01\x08\x00\x00\x00\x00amusing')
'TALB' (Album/Movie/Show title)                     'Even Worse'
'TBPM' (BPM (beats per minute))                     '130.0'
'TIT2' (Title/songname/content description)         'Melanie'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Weird Al Yankovic'
'TRCK' (Track number/Position in set)               '7'
'TXXX:q-bass'                                       '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '4'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'39737b0a-4fbe-453a-9ac2-acb53504bbd8')

========================== row from database ==========================
                                              'id'  1538441
                                            'path'  /data/Music/Other/PrevSet/[9amusing]/Weird Al Yankovic/Melanie.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  238
                                           'genre'  
                                        'filesize'  3813376
                                           'mtime'  1662800546
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9amusing]
                                      'tag_artist'  Weird Al Yankovic
                                     'tag_release'  Even Worse
                                       'tag_title'  Melanie
                                             'bpm'  130.0
                                    'search_title'  'melanie':1
                                   'search_artist'  'al':2 'weird':1 'yankovic':3
                                  'search_release'  'even':1 'worse':2
                                     'search_rest'  '9amusing':2,3 'prev':4 'prevset':1 'set':5
                                    'search_combo'  '9amusing':8,9 'al':3B 'even':5C 'melanie':1A 'prev':10 'prevset':7 'set':11 'weird':2B 'worse':6C 'yankovic':4B
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['q-bass-3', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-4']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800545.7849953  (2022-09-10 11:02:25)
                             'size'  3813376