======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '351'
                                          'artist'  'Led Zeppelin'
                                     'text_people'  'Jimmy Page & Robert Plant'
                                         'release'  'Led Zeppelin IV'
                                           'title'  'The Battle of Evermore'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']"
                                     'discogstags'  "['rock', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '1971'
                                        'comments'  ''
                                           'genre'  'rock-cppex-progressive'
                                             'bpm'  '98.3'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:§\r\x00\x00'                     PRIV(owner='AverageLevel', data=b'\xa7\r\x00\x00')
'PRIV:PeakValue:Îa\x00\x00'                         PRIV(owner='PeakValue', data=b'\xcea\x00\x00')
'TALB' (Album/Movie/Show title)                     'Led Zeppelin IV'
'TBPM' (BPM (beats per minute))                     '98.3'
'TCOM' (Composer)                                   'Jimmy Page & Robert Plant'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-progressive'
'TDRC' (Recording time)                             '1971'
'TIT2' (Title/songname/content description)         'The Battle of Evermore'
'TKEY' (Initial key)                                '8A'
'TLEN' (Length)                                     '351503'
'TPE1' (Lead performer(s)/Soloist(s))               'Led Zeppelin'
'TRCK' (Track number/Position in set)               '3'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'classic rock']
'TXXX:lastfmtags'                                   ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.59 dB'
'TXXX:replaygain_track_peak'                        '0.540321'

========================== row from database ==========================
                                              'id'  1413447
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Led Zeppelin/Led Zeppelin IV/Led Zeppelin - (1971) Led Zeppelin IV - 03 - The Battle of Evermore.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  351
                                           'genre'  rock-cppex-progressive
                                        'filesize'  5624893
                                           'mtime'  1620736225
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy (1971) 03 rock cppex progressive
                                      'tag_artist'  Led Zeppelin
                                     'tag_release'  Led Zeppelin IV
                                       'tag_title'  The Battle of Evermore
                                             'bpm'  98.3
                                    'search_title'  'battle':2 'evermore':4 'of':3 'the':1
                                   'search_artist'  'led':1 'zeppelin':2
                                  'search_release'  'iv':3 'led':1 'zeppelin':2
                                     'search_rest'  '1971':2,3 'classicprogpsy':1 'cppex':5 'progressive':6 'rock':4
                                    'search_combo'  '1971':11,12 'battle':2A 'classicprogpsy':10 'cppex':14 'evermore':4A 'iv':9C 'led':5B,7C 'of':3A 'progressive':15 'rock':13 'the':1A 'zeppelin':6B,8C
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-3']
                                      'lastfmtags'  ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
                                        'tag_date'  1971
                                     'discogstags'  ['rock', 'classic rock']

============================== file details ==============================
                                           'mtime'  1620736225.224621  (2021-05-11 14:30:25)
                             'size'  5624893