======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '240'
                                          'artist'  'Garmarna'
                                     'text_people'  ''
                                         'release'  'Vedergällningen'
                                           'title'  'Gamen'
                                           'quals'  "['q-bass-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '139.9'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=204)
'PRIV:www.mexp.dk:\x01\x0b\x00\x00\x00\x00good stuff\x01\x07\x00\x00\x00\x00active'  PRIV(owner='www.mexp.dk', data=b'\x01\x0b\x00\x00\x00\x00good stuff\x01\x07\x00\x00\x00\x00active')
'TALB' (Album/Movie/Show title)                     'Vedergällningen'
'TBPM' (BPM (beats per minute))                     '139.9'
'TIT2' (Title/songname/content description)         'Gamen'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Garmarna'
'TRCK' (Track number/Position in set)               '1'
'TXXX:MusicBrainz Album Id'                         'dbb469b8-4cd8-43d5-9a48-109e017ce287'
'TXXX:MusicBrainz Artist Id'                        'a1db6190-4f83-482e-a794-0088b2b4136d'
'TXXX:MusicBrainz TRM Id'                           'b996c5de-e2bd-4aa9-82b3-596718b37333'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'c658e2d9-6257-4a5e-9661-0af89e8ede93')

========================== row from database ==========================
                                              'id'  1538439
                                            'path'  /data/Music/Other/PrevSet/[0yay1]/Garmarna/Gamen.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  240
                                           'genre'  
                                        'filesize'  3858432
                                           'mtime'  1662800207
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [0yay1]
                                      'tag_artist'  Garmarna
                                     'tag_release'  Vedergällningen
                                       'tag_title'  Gamen
                                             'bpm'  139.9
                                    'search_title'  'gamen':1
                                   'search_artist'  'garmarna':1
                                  'search_release'  'vedergallningen':1,2
                                     'search_rest'  '0yay1':2,3 'prev':4 'prevset':1 'set':5
                                    'search_combo'  '0yay1':6,7 'gamen':1A 'garmarna':2B 'prev':8 'prevset':5 'set':9 'vedergallningen':3C,4C
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['q-bass-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800207.3559203  (2022-09-10 10:56:47)
                             'size'  3858432