======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '6'
                                          'artist'  'Edison'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Mary Had A Little Lamb, labratory test'
                                           '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'  "['soundtrack', 'instrumental', 'black lagoon', 'japanese', 'anime']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1978'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '117.5'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '117.5'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1978'
'TIT2' (Title/songname/content description)         'Mary Had A Little Lamb, labratory test'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Edison'
'TXXX:Mp3gain_minmax'                               '137,154'
'TXXX:Mp3gain_undo'                                 '+002,+002,N'
'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'                                   ['soundtrack', 'instrumental', 'black lagoon', 'japanese', 'anime']
'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'                        '+2.16 dB'
'TXXX:replaygain_track_peak'                        '0.356555'

========================== row from database ==========================
                                              'id'  514936
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1878 - Edison - Mary Had A Little Lamb, labratory test.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  6
                                           'genre'  prerock-unsorted
                                        'filesize'  125307
                                           'mtime'  1621698439
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1878 prerock unsorted
                                      'tag_artist'  Edison
                                     'tag_release'  None
                                       'tag_title'  Mary Had A Little Lamb, labratory test
                                             'bpm'  117.5
                                    'search_title'  'a':3 'had':2 'labratory':7 'lamb':5,6 'little':4 'mary':1 'test':8
                                   'search_artist'  'edison':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':20 'recordings':8,9,10 'unsorted':21 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':20 '1920':21 '32k':23,25,27 'a':3A 'cylinder':11,13 'cylindervery':15 'edison':9B 'had':2A 'labratory':7A 'lamb':5A,6A 'little':4A 'mary':1A 'old':16 'prerock':29 'recordings':17,18,19 'test':8A 'unsorted':30 'very':12,14 'wax':10 'wma':22,24,26 'wma32k':28
                                    '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-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['soundtrack', 'instrumental', 'black lagoon', 'japanese', 'anime']
                                        'tag_date'  1978
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698439.3864524  (2021-05-22 17:47:19)
                             'size'  125307