======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '190'
                                          'artist'  'Bert Williams'
                                     'text_people'  ''
                                         'release'  'single'
                                           'title'  'The Darktown Poker Club'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1900s', 'vaudeville', 'comedy', '78rpm', 'antigua']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1914'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '127.8'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'single'
'TBPM' (BPM (beats per minute))                     '127.8'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '1914'
'TIT2' (Title/songname/content description)         'The Darktown Poker Club'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bert Williams'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1900s', 'vaudeville', 'comedy', '78rpm', 'antigua']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+3.32 dB'
'TXXX:replaygain_track_peak'                        '0.751493'

========================== row from database ==========================
                                              'id'  512300
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1914 - Bert Williams - The Darktown Poker Club.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  190
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  3049344
                                           'mtime'  1620539135
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1914 prerock jb jazz unsorted
                                      'tag_artist'  Bert Williams
                                     'tag_release'  single
                                       'tag_title'  The Darktown Poker Club
                                             'bpm'  127.8
                                    'search_title'  'club':4 'darktown':2 'poker':3 'the':1
                                   'search_artist'  'bert':1 'williams':2
                                  'search_release'  'single':1
                                     'search_rest'  '1878':11 '1914':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'jazz':23 'jb':22 'old':7 'prerock':21 'recordings':8,9,10 'unsorted':24 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':18 '1914':27 '1920':19 '32k':21,23,25 'bert':5B 'club':4A 'cylinder':9,11 'cylindervery':13 'darktown':2A 'jazz':30 'jb':29 'old':14 'poker':3A 'prerock':28 'recordings':15,16,17 'single':7C 'the':1A 'unsorted':31 'very':10,12 'wax':8 'williams':6B 'wma':20,22,24 'wma32k':26
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1900s', 'vaudeville', 'comedy', '78rpm', 'antigua']
                                        'tag_date'  1914
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620539134.6604233  (2021-05-09 07:45:34)
                             'size'  3049344