======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '337'
                                          'artist'  'Zhang Ziqian'
                                     'text_people'  ''
                                         'release'  'Guangling Ming Dynasty'
                                           'title'  'Lung Exercises'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-3', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'Q-OLDST-1', "
 "'Q-LOCALNESS-4', 'Q-PLAY-2', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-vocals-1', 'q-mixbeat-1', "
 "'Q-PIANO-2']")
                                      'lastfmtags'  "['traditional', 'wood and string', 'guqin', 'chinese']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1960'
                                        'comments'  ''
                                           'genre'  'loc-asia-china'
                                             'bpm'  '117.671'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:{\x10\x00\x00'                   PRIV(owner='AverageLevel', data=b'{\x10\x00\x00')
'PRIV:PeakValue:!\x7f\x00\x00'                      PRIV(owner='PeakValue', data=b'!\x7f\x00\x00')
'TALB' (Album/Movie/Show title)                     'Guangling Ming Dynasty'
'TBPM' (BPM (beats per minute))                     '117.671'
'TCON' (Content type, a.k.a. Genre)                 'loc-asia-china'
'TDRC' (Recording time)                             '1960'
'TIT2' (Title/songname/content description)         'Lung Exercises'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Zhang Ziqian'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '4'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '3'
'TXXX:lastfmtags'                                   ['traditional', 'wood and string', 'guqin', 'chinese']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+4.13 dB'
'TXXX:replaygain_track_peak'                        '0.991558'
'TXXX:tracknum'                                     '02'

========================== row from database ==========================
                                              'id'  928382
                                            'path'  /data/Music/Bulk/00localcharacter/00asia/zhang ziqian - guangling faction ming dynasty/02 - track 2.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  337
                                           'genre'  loc-asia-china
                                        'filesize'  8101010
                                           'mtime'  1621627038
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 00asia zhang ziqian guangling faction ming dynasty 02 track 2 loc asia china
                                      'tag_artist'  Zhang Ziqian
                                     'tag_release'  Guangling Ming Dynasty
                                       'tag_title'  Lung Exercises
                                             'bpm'  117.671
                                    'search_title'  'exercises':2 'lung':1
                                   'search_artist'  'zhang':1 'ziqian':2
                                  'search_release'  'dynasty':3 'guangling':1 'ming':2
                                     'search_rest'  '00asia':1 '2':9 'asia':11 'china':12 'dynasty':7 'faction':5 'guangling':4 'loc':10 'ming':6 'track':8 'zhang':2 'ziqian':3
                                    'search_combo'  '00asia':8 '2':16 'asia':18 'china':19 'dynasty':7C,14 'exercises':2A 'faction':12 'guangling':5C,11 'loc':17 'lung':1A 'ming':6C,13 'track':15 'zhang':3B,9 'ziqian':4B,10
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-4', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['traditional', 'wood and string', 'guqin', 'chinese']
                                        'tag_date'  1960
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627037.669795  (2021-05-21 21:57:17)
                             'size'  8101010