======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '294'
                                          'artist'  'Greatest Hits'
                                     'text_people'  ''
                                         'release'  'Greatest Hits'
                                           'title'  "Don't Let It End"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['indie', 'olde english spelling bee', 'warps space and time', 'pendulum', "
 "'synthpop']")
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '16'
                                      'tracktotal'  ''
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'rock-cppex-progressive'
                                             'bpm'  '112.947'
                                             'key'  '3B'
                                        'acoustid'  ''
rest: ''

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

'COMM:Media Jukebox: Tool Name:\x00\x00\x00'        'Media Center'
'COMM:Media Jukebox: Tool Version:\x00\x00\x00'     '9.1.316'
'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')
'TALB' (Album/Movie/Show title)                     'Greatest Hits'
'TBPM' (BPM (beats per minute))                     '112.947'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-progressive'
'TDRC' (Recording time)                             '2000'
'TIT2' (Title/songname/content description)         "Don't Let It End"
'TKEY' (Initial key)                                '3B'
'TPE1' (Lead performer(s)/Soloist(s))               'Styx'
'TPE2' (Band/orchestra/accompaniment)               'Greatest Hits'
'TRCK' (Track number/Position in set)               '16'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['indie',
 'olde english spelling bee',
 'warps space and time',
 'pendulum',
 'synthpop']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.66 dB'
'TXXX:replaygain_track_peak'                        '0.472862'

========================== row from database ==========================
                                              'id'  1502920
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Styx - Greatest Hits/16 - Don_t Let It End.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  294
                                           'genre'  rock-cppex-progressive
                                        'filesize'  7059328
                                           'mtime'  1620737760
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy Styx 16 Don_t rock cppex progressive
                                      'tag_artist'  Greatest Hits
                                     'tag_release'  Greatest Hits
                                       'tag_title'  Don't Let It End
                                             'bpm'  112.947
                                    'search_title'  'don':1 'dont':3 'end':6 'it':5 'let':4 't':2
                                   'search_artist'  'greatest':1 'hits':2
                                  'search_release'  'greatest':1 'hits':2
                                     'search_rest'  'classicprogpsy':1 'cppex':6 'don':3 'progressive':7 'rock':5 'styx':2 't':4
                                    'search_combo'  'classicprogpsy':11 'cppex':16 'don':1A,13 'dont':3A 'end':6A 'greatest':7B,9C 'hits':8B,10C 'it':5A 'let':4A 'progressive':17 'rock':15 'styx':12 't':2A,14
                                    'tag_tracknum'  16
                                      'num_images'  0
                                             'key'  3B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['indie', 'olde english spelling bee', 'warps space and time', 'pendulum', 'synthpop']
                                        'tag_date'  2000
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1620737760.3964186  (2021-05-11 14:56:00)
                             'size'  7059328