======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '161'
                                          'artist'  'Unknown baby'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Baby song (144 rpm)'
                                           '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-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['spoken word', 'crying', 'babycore', 'cylinder', 'the vitamin b12']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1892'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '143.7'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '143.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TCOP' (Copyright message)                          '© 2005 Regents of the University of California'
'TDRC' (Recording time)                             '1892'
'TIT2' (Title/songname/content description)         'Baby song (144 rpm)'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               'Unknown baby'
'TXXX:Engineer'                                     'Noah Pollaczek'
'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'                                   ['spoken word', 'crying', 'babycore', 'cylinder', 'the vitamin b12']
'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'                        '+1.29 dB'
'TXXX:replaygain_track_peak'                        '0.603032'

========================== row from database ==========================
                                              'id'  512621
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1892 - Baby not identified - Baby Song.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  161
                                           'genre'  prerock-unsorted
                                        'filesize'  2583176
                                           'mtime'  1621698444
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1892 not identified Song prerock unsorted
                                      'tag_artist'  Unknown baby
                                     'tag_release'  None
                                       'tag_title'  Baby song (144 rpm)
                                             'bpm'  143.7
                                    'search_title'  '144':3,4 'baby':1 'rpm':5,6 'song':2
                                   'search_artist'  'baby':2 'unknown':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1892':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'identified':22 'not':21 'old':7 'prerock':24 'recordings':8,9,10 'song':23 'unsorted':25 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '144':3A,4A '1878':19 '1892':28 '1920':20 '32k':22,24,26 'baby':1A,8B 'cylinder':10,12 'cylindervery':14 'identified':30 'not':29 'old':15 'prerock':32 'recordings':16,17,18 'rpm':5A,6A 'song':2A,31 'unknown':7B 'unsorted':33 'very':11,13 'wax':9 'wma':21,23,25 'wma32k':27
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  2A
                                           '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'  ['spoken word', 'crying', 'babycore', 'cylinder', 'the vitamin b12']
                                        'tag_date'  1892
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698444.2330832  (2021-05-22 17:47:24)
                             'size'  2583176