======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '169'
                                          'artist'  'Ada Jones & Len Spencer'
                                     'text_people'  ''
                                         'release'  'Victor-4670'
                                           'title'  'Mandy and her Man (1906)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jewish', 'vaudeville', 'cylinder', 'musical', 'early recordings']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1906'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '112.4'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Preference:\x00\x00\x00'           'Excellent'
'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'TALB' (Album/Movie/Show title)                     'Victor-4670'
'TBPM' (BPM (beats per minute))                     '112.4'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1906'
'TIT2' (Title/songname/content description)         'Mandy and her Man (1906)'
'TKEY' (Initial key)                                '6B'
'TLEN' (Length)                                     '169000'
'TMED' (Media type)                                 'LIN'
'TPE1' (Lead performer(s)/Soloist(s))               'Ada Jones & Len Spencer'
'TRCK' (Track number/Position in set)               '00'
'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'                                   ['jewish', 'vaudeville', 'cylinder', 'musical', 'early recordings']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+3.30 dB'
'TXXX:replaygain_track_peak'                        '0.843773'

========================== row from database ==========================
                                              'id'  514457
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1906 - Ada Jones - (L.Spencer) Mandy And Her Man [speech].mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  169
                                           'genre'  prerock-vocal
                                        'filesize'  2713674
                                           'mtime'  1621853374
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] (L.Spencer) And Her [speech] prerock vocal
                                      'tag_artist'  Ada Jones & Len Spencer
                                     'tag_release'  Victor-4670
                                       'tag_title'  Mandy and her Man (1906)
                                             'bpm'  112.4
                                    'search_title'  '1906':5,6 'and':2 'her':3 'man':4 'mandy':1
                                   'search_artist'  'ada':1 'jones':2 'len':3 'spencer':4
                                  'search_release'  '4670':2 'victor':1 'victor4670':3
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'and':23 'cylinder':2,4 'cylindervery':6 'her':24 'l':20 'lspencer':22 'old':7 'prerock':27 'recordings':8,9,10 'speech':25,26 'spencer':21 'very':3,5 'vocal':28 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':24 '1906':5A,6A '1920':25 '32k':27,29,31 '4670':12C 'ada':7B 'and':2A,36 'cylinder':15,17 'cylindervery':19 'her':3A,37 'jones':8B 'l':33 'len':9B 'lspencer':35 'man':4A 'mandy':1A 'old':20 'prerock':40 'recordings':21,22,23 'speech':38,39 'spencer':10B,34 'very':16,18 'victor':11C 'victor4670':13C 'vocal':41 'wax':14 'wma':26,28,30 'wma32k':32
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6B
                                           '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-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['jewish', 'vaudeville', 'cylinder', 'musical', 'early recordings']
                                        'tag_date'  1906
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853374.0987244  (2021-05-24 12:49:34)
                             'size'  2713674