======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '174'
                                          'artist'  'Vess L. Ossman'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'By the Sycamore Tree (Coon Medly) 1904'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-2', '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-3', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-1']")
                                      'lastfmtags'  "['1910s', 'ragtime', 'banjo', 'explore', 'all']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1904'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '123.3'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'TBPM' (BPM (beats per minute))                     '123.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1904'
'TIT2' (Title/songname/content description)         'By the Sycamore Tree (Coon Medly) 1904'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Vess L. Ossman'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1910s', 'ragtime', 'banjo', 'explore', 'all']
'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'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.97 dB'
'TXXX:replaygain_track_peak'                        '0.658527'

========================== row from database ==========================
                                              'id'  513372
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1904 - Vess Ossman - (W.P.Hunter) By the Sycamore Tree.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  174
                                           'genre'  prerock-unsorted
                                        'filesize'  2791013
                                           'mtime'  1620387954
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] (W.P.Hunter) prerock unsorted
                                      'tag_artist'  Vess L. Ossman
                                     'tag_release'  None
                                       'tag_title'  By the Sycamore Tree (Coon Medly) 1904
                                             'bpm'  123.3
                                    'search_title'  '1904':9 'by':1 'coon':5,6 'medly':7,8 'sycamore':3 'the':2 'tree':4
                                   'search_artist'  'l':2,3 'ossman':4 'vess':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'hunter':22 'old':7 'p':21 'prerock':24 'recordings':8,9,10 'unsorted':25 'very':3,5 'w':20 'wax':1 'wma':13,15,17 'wma32k':19 'wphunter':23
                                    'search_combo'  '1878':24 '1904':9A '1920':25 '32k':27,29,31 'by':1A 'coon':5A,6A 'cylinder':15,17 'cylindervery':19 'hunter':35 'l':11B,12B 'medly':7A,8A 'old':20 'ossman':13B 'p':34 'prerock':37 'recordings':21,22,23 'sycamore':3A 'the':2A 'tree':4A 'unsorted':38 'very':16,18 'vess':10B 'w':33 'wax':14 'wma':26,28,30 'wma32k':32 'wphunter':36
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1910s', 'ragtime', 'banjo', 'explore', 'all']
                                        'tag_date'  1904
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620387954.1176214  (2021-05-07 13:45:54)
                             'size'  2791013