======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '168'
                                          'artist'  ''
                                     'text_people'  ''
                                         'release'  'Ragtime To Jazz'
                                           'title'  'Blaze Away'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-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-4', 'q-vocals-1', 'q-mixbeat-1', "
 "'Q-PIANO-3']")
                                      'lastfmtags'  "['trance', 'jazz', 'electronic', 'techno', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '20'
                                      'tracktotal'  ''
                                            'date'  '1900'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '95.3'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Ragtime To Jazz'
'TBPM' (BPM (beats per minute))                     '95.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1900'
'TIT2' (Title/songname/content description)         'Blaze Away'
'TKEY' (Initial key)                                '7A'
'TLEN' (Length)                                     '168463'
'TMED' (Media type)                                 'DIG'
'TPE1' (Lead performer(s)/Soloist(s))               'Various Artists'
'TRCK' (Track number/Position in set)               '20'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['trance', 'jazz', 'electronic', 'techno', 'rock']
'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'                                      '4'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.54 dB'
'TXXX:replaygain_track_peak'                        '0.505823'

========================== row from database ==========================
                                              'id'  514507
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1918 - Mike Bernard - Blaze Away.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  168
                                           'genre'  prerock-unsorted
                                        'filesize'  2697088
                                           'mtime'  1676052992
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1918 Mike Bernard prerock unsorted
                                      'tag_artist'  Various Artists
                                     'tag_release'  Ragtime To Jazz
                                       'tag_title'  Blaze Away
                                             'bpm'  95.3
                                    'search_title'  'away':2 'blaze':1
                                   'search_artist'  'artists':2 'various':1
                                  'search_release'  'jazz':3 'ragtime':1 'to':2
                                     'search_rest'  '1878':11 '1918':20 '1920':12 '32k':14,16,18 'bernard':22 'cylinder':2,4 'cylindervery':6 'mike':21 'old':7 'prerock':23 'recordings':8,9,10 'unsorted':24 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':16 '1918':25 '1920':17 '32k':19,21,23 'away':2A 'bernard':27 'blaze':1A 'cylinder':7,9 'cylindervery':11 'jazz':5C 'mike':26 'old':12 'prerock':28 'ragtime':3C 'recordings':13,14,15 'to':4C 'unsorted':29 'very':8,10 'wax':6 'wma':18,20,22 'wma32k':24
                                    'tag_tracknum'  20
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-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-4', 'q-vocals-1', 'q-mixbeat-1', 'Q-PIANO-3']
                                      'lastfmtags'  ['trance', 'jazz', 'electronic', 'techno', 'rock']
                                        'tag_date'  1900
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1676052992.3015904  (2023-02-10 19:16:32)
                             'size'  2697088