======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '130'
                                          'artist'  'unknown'
                                     'text_people'  ''
                                         'release'  'Wax Cylinder'
                                           'title'  'Cuddle Up a Little Closer, Lovey Mine'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['90s', 'leapsandbounds cdcollection', '80ies', 'comedy', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '0'
                                      'tracktotal'  ''
                                            'date'  '1908'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '109.1'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1:eng'                                    'Wax Cylinder'
'PRIV:AverageLevel:\x03\x0e\x00\x00'                PRIV(owner='AverageLevel', data=b'\x03\x0e\x00\x00')
'PRIV:PeakValue:òn\x00\x00'                         PRIV(owner='PeakValue', data=b'\xf2n\x00\x00')
'TALB' (Album/Movie/Show title)                     'Wax Cylinder'
'TBPM' (BPM (beats per minute))                     '109.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1908'
'TIT2' (Title/songname/content description)         'Cuddle Up a Little Closer, Lovey Mine'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'unknown'
'TRCK' (Track number/Position in set)               '0'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['90s', 'leapsandbounds cdcollection', '80ies', 'comedy', 'classic rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.58 dB'
'TXXX:replaygain_track_peak'                        '0.612909'

========================== row from database ==========================
                                              'id'  512910
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1908 - Unknown - Cuddle Up a Little Closer,Lovey Mine (Wax Cylinder).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  130
                                           'genre'  prerock-unsorted
                                        'filesize'  2085157
                                           'mtime'  1621698455
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Cylinder／very old recordings： 1878 1920 [wma／32k] 1908 Unknown Closer,Lovey (Wax Cylinder) prerock unsorted
                                      'tag_artist'  unknown
                                     'tag_release'  Wax Cylinder
                                       'tag_title'  Cuddle Up a Little Closer, Lovey Mine
                                             'bpm'  109.1
                                    'search_title'  'a':3 'closer':5,6 'cuddle':1 'little':4 'lovey':7 'mine':8 'up':2
                                   'search_artist'  'unknown':1
                                  'search_release'  'cylinder':2 'wax':1
                                     'search_rest'  '1878':10 '1908':19 '1920':11 '32k':13,15,17 'closer':21,23 'cylinder':1,3,27,28 'cylindervery':5 'lovey':22,24 'old':6 'prerock':29 'recordings':7,8,9 'unknown':20 'unsorted':30 'very':2,4 'wax':25,26 'wma':12,14,16 'wma32k':18
                                    'search_combo'  '1878':21 '1908':30 '1920':22 '32k':24,26,28 'a':3A 'closer':5A,6A,32,34 'cuddle':1A 'cylinder':11C,12,14,38,39 'cylindervery':16 'little':4A 'lovey':7A,33,35 'mine':8A 'old':17 'prerock':40 'recordings':18,19,20 'unknown':9B,31 'unsorted':41 'up':2A 'very':13,15 'wax':10C,36,37 'wma':23,25,27 'wma32k':29
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['90s', 'leapsandbounds cdcollection', '80ies', 'comedy', 'classic rock']
                                        'tag_date'  1908
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698455.175468  (2021-05-22 17:47:35)
                             'size'  2085157