======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '155'
                                          'artist'  'Breda  Jazz'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Charleston is the best dance'
                                           'quals'  "['q-bass-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '126.8'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=153)
'TBPM' (BPM (beats per minute))                     '126.8'
'TIT2' (Title/songname/content description)         'Charleston is the best dance'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Breda  Jazz'
'TXXX:q-bass'                                       '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '1'

========================== row from database ==========================
                                              'id'  1538598
                                            'path'  /data/Music/Other/PrevSet/[5jazz, blues]/Charleston is the best dance.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  155
                                           'genre'  
                                        'filesize'  3116739
                                           'mtime'  1662800397
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [5jazz, blues]
                                      'tag_artist'  Breda  Jazz
                                     'tag_release'  None
                                       'tag_title'  Charleston is the best dance
                                             'bpm'  126.8
                                    'search_title'  'best':4 'charleston':1 'dance':5 'is':2 'the':3
                                   'search_artist'  'breda':1 'jazz':2
                                  'search_release'  
                                     'search_rest'  '5jazz':2,3 'blues':4,5 'prev':6 'prevset':1 'set':7
                                    'search_combo'  '5jazz':9,10 'best':4A 'blues':11,12 'breda':6B 'charleston':1A 'dance':5A 'is':2A 'jazz':7B 'prev':13 'prevset':8 'set':14 'the':3A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['q-bass-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800396.7978046  (2022-09-10 10:59:56)
                             'size'  3116739