======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '166'
                                          'artist'  'Animaniacs'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Hello Nurse Song'
                                           'quals'  "['q-bass-4', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '97.4'
                                             'key'  '7A'
                                        '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')
'TBPM' (BPM (beats per minute))                     '97.4'
'TIT2' (Title/songname/content description)         'Hello Nurse Song'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Animaniacs'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '4'

========================== row from database ==========================
                                              'id'  1538697
                                            'path'  /data/Music/Other/PrevSet/[8ohdear]/Animaniacs/Hello Nurse Song.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  166
                                           'genre'  
                                        'filesize'  2662574
                                           'mtime'  1662800532
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [8ohdear]
                                      'tag_artist'  Animaniacs
                                     'tag_release'  None
                                       'tag_title'  Hello Nurse Song
                                             'bpm'  97.4
                                    'search_title'  'hello':1 'nurse':2 'song':3
                                   'search_artist'  'animaniacs':1
                                  'search_release'  
                                     'search_rest'  '8ohdear':2,3 'prev':4 'prevset':1 'set':5
                                    'search_combo'  '8ohdear':6,7 'animaniacs':4B 'hello':1A 'nurse':2A 'prev':8 'prevset':5 'set':9 'song':3A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['q-bass-4', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800532.1094368  (2022-09-10 11:02:12)
                             'size'  2662574