======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '194'
                                          'artist'  'Russell Hunting'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Dear Kind Doctor - (Wax Cylinder)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['comedy', 'grammophon', '1890s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1896'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '96.0'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '96.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1896'
'TIT2' (Title/songname/content description)         'Dear Kind Doctor - (Wax Cylinder)'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Russell Hunting'
'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'                                   ['comedy', 'grammophon', '1890s']
'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'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.53 dB'
'TXXX:replaygain_track_peak'                        '0.607991'

========================== row from database ==========================
                                              'id'  513634
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1896 - Russell Hunting - Dear Kind Doctor - (Wax Cylinder).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  194
                                           'genre'  prerock-unsorted
                                        'filesize'  3114731
                                           'mtime'  1621698450
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Cylinder／very old recordings： 1878 1920 [wma／32k] 1896 prerock unsorted
                                      'tag_artist'  Russell Hunting
                                     'tag_release'  None
                                       'tag_title'  Dear Kind Doctor - (Wax Cylinder)
                                             'bpm'  96.0
                                    'search_title'  'cylinder':6,7 'dear':1 'doctor':3 'kind':2 'wax':4,5
                                   'search_artist'  'hunting':2 'russell':1
                                  'search_release'  
                                     'search_rest'  '1878':10 '1896':19 '1920':11 '32k':13,15,17 'cylinder':1,3 'cylindervery':5 'old':6 'prerock':20 'recordings':7,8,9 'unsorted':21 'very':2,4 'wma':12,14,16 'wma32k':18
                                    'search_combo'  '1878':19 '1896':28 '1920':20 '32k':22,24,26 'cylinder':6A,7A,10,12 'cylindervery':14 'dear':1A 'doctor':3A 'hunting':9B 'kind':2A 'old':15 'prerock':29 'recordings':16,17,18 'russell':8B 'unsorted':30 'very':11,13 'wax':4A,5A 'wma':21,23,25 'wma32k':27
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           '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-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['comedy', 'grammophon', '1890s']
                                        'tag_date'  1896
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698449.6074834  (2021-05-22 17:47:29)
                             'size'  3114731