======================== unified (from filesystem) ========================
                                         'bitrate'  '32.0'
                                        'duration'  '155'
                                          'artist'  'Ada Jones'
                                     'text_people'  ''
                                         'release'  'Victor  17491-B'
                                           'title'  'Wilhelm The Grocer'
                                           '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'  "['gramophone', 'female vocalists', 'tin pan alley', 'vocal', 'all']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1914'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '90.6'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         '©1999 Turtle Services Limited'
'TALB' (Album/Movie/Show title)                     'Victor  17491-B'
'TBPM' (BPM (beats per minute))                     '90.6'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1914'
'TIT2' (Title/songname/content description)         'Wilhelm The Grocer'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ada Jones'
'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'                                   ['gramophone', 'female vocalists', 'tin pan alley', 'vocal', 'all']
'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'                        '+1.98 dB'
'TXXX:replaygain_track_peak'                        '0.584687'

========================== row from database ==========================
                                              'id'  513661
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1914 - Ada Jones - Wilhelm The Grocer.mp3
                                         'working'  None
                                         'bitrate'  32
                                    'duration_sec'  155
                                           'genre'  prerock-vocal
                                        'filesize'  622747
                                           'mtime'  1621853377
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1914 prerock vocal
                                      'tag_artist'  Ada Jones
                                     'tag_release'  Victor  17491-B
                                       'tag_title'  Wilhelm The Grocer
                                             'bpm'  90.6
                                    'search_title'  'grocer':3 'the':2 'wilhelm':1
                                   'search_artist'  'ada':1 'jones':2
                                  'search_release'  '17491':2 '17491b':4 'b':3 'victor':1
                                     'search_rest'  '1878':11 '1914':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':21 'recordings':8,9,10 'very':3,5 'vocal':22 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '17491':7C '17491b':9C '1878':20 '1914':29 '1920':21 '32k':23,25,27 'ada':4B 'b':8C 'cylinder':11,13 'cylindervery':15 'grocer':3A 'jones':5B 'old':16 'prerock':30 'recordings':17,18,19 'the':2A 'very':12,14 'victor':6C 'vocal':31 'wax':10 'wilhelm':1A 'wma':22,24,26 'wma32k':28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  4A
                                           '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'  ['gramophone', 'female vocalists', 'tin pan alley', 'vocal', 'all']
                                        'tag_date'  1914
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853377.215037  (2021-05-24 12:49:37)
                             'size'  622747