======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '161'
                                          'artist'  'Len Spencer'
                                     'text_people'  ''
                                         'release'  'Victor-16106 (2113)'
                                           'title'  "Lincoln's Speech at Gettysburg (1903)"
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  "['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1903'
                                        'comments'  ''
                                           'genre'  'prerock-nonmusic'
                                             'bpm'  '92.4'
                                             'key'  '4A'
                                        '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-16106 (2113)'
'TBPM' (BPM (beats per minute))                     '92.4'
'TCON' (Content type, a.k.a. Genre)                 'prerock-nonmusic'
'TDRC' (Recording time)                             '1903'
'TIT2' (Title/songname/content description)         "Lincoln's Speech at Gettysburg (1903)"
'TKEY' (Initial key)                                '4A'
'TLEN' (Length)                                     '161000'
'TMED' (Media type)                                 'LIN'
'TPE1' (Lead performer(s)/Soloist(s))               'Len Spencer'
'TRCK' (Track number/Position in set)               '00'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']
'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'                        '+2.04 dB'
'TXXX:replaygain_track_peak'                        '0.565312'

========================== row from database ==========================
                                              'id'  1504496
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1903 - Len Spencer - Lincoln_s Speech at Gettysburg - Victor-1610.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  161
                                           'genre'  prerock-nonmusic
                                        'filesize'  2587460
                                           'mtime'  1674646614
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] Lincoln_s prerock nonmusic
                                      'tag_artist'  Len Spencer
                                     'tag_release'  Victor-16106 (2113)
                                       'tag_title'  Lincoln's Speech at Gettysburg (1903)
                                             'bpm'  92.4
                                    'search_title'  '1903':7,8 'at':5 'gettysburg':6 'lincoln':1 'lincolns':3 's':2 'speech':4
                                   'search_artist'  'len':1 'spencer':2
                                  'search_release'  '16106':2 '2113':4,5 'victor':1 'victor16106':3
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'lincoln':20 'nonmusic':23 'old':7 'prerock':22 'recordings':8,9,10 's':21 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '16106':12C '1878':26 '1903':7A,8A '1920':27 '2113':14C,15C '32k':29,31,33 'at':5A 'cylinder':17,19 'cylindervery':21 'gettysburg':6A 'len':9B 'lincoln':1A,35 'lincolns':3A 'nonmusic':38 'old':22 'prerock':37 'recordings':23,24,25 's':2A,36 'speech':4A 'spencer':10B 'very':18,20 'victor':11C 'victor16106':13C 'wax':16 'wma':28,30,32 'wma32k':34
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  4A
                                           'quals'  ['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  ['1900s', 'old fashioned', 'all', 'oldies', 'acoustic era']
                                        'tag_date'  1903
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1674646614.1307182  (2023-01-25 12:36:54)
                             'size'  2587460