======================== unified (from filesystem) ========================
                                         'bitrate'  '194.069'
                                        'duration'  '432'
                                          'artist'  'Charlie Haden'
                                     'text_people'  'John Newton/Traditional'
                                         'release'  'Not In Our Name'
                                           'title'  'amazing grace'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'Q-PLAY-2', 'q-bass-4', 'q-busy-2', 'q-grit-1', "
 "'Q-PIANO-2', 'q-chart-1', 'q-drums-2', 'q-other-3', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['fip', 'bass', 'free jazz', 'jazz', 'jazz bass', 'modern jazz']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  ''
                                            'date'  '2005'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '141.2'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

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'PRIV:WM/WMCollectionID:o\x15³\x8d¡Ö\nK´§àÃüëTå'    PRIV(owner='WM/WMCollectionID', data=b'o\x15\xb3\x8d\xa1\xd6\nK\xb4\xa7\xe0\xc3\xfc\xebT\xe5')
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'PRIV:ZuneCollectionID:h}³å\r¾]K®m¤P\x12\x04\x1b¼'  PRIV(owner='ZuneCollectionID', data=b'h}\xb3\xe5\r\xbe]K\xaem\xa4P\x12\x04\x1b\xbc')
'TALB' (Album/Movie/Show title)                     'Not In Our Name'
'TBPM' (BPM (beats per minute))                     '141.2'
'TCOM' (Composer)                                   'John Newton/Traditional'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '2005'
'TENC' (Encoded by)                                 'Exact Audio Copy   (Mode Sécurisé)'
'TIT2' (Title/songname/content description)         'amazing grace'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Charlie Haden/Liberation Music Orchestra'
'TPE2' (Band/orchestra/accompaniment)               'Charlie Haden'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Verve'
'TRCK' (Track number/Position in set)               '5'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['fip', 'bass', 'free jazz', 'jazz', 'jazz bass', 'modern jazz']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.22 dB'
'TXXX:replaygain_track_peak'                        '0.513073'

========================== row from database ==========================
                                              'id'  648701
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/music for maniacs/amazing grace.mp3
                                         'working'  None
                                         'bitrate'  194
                                    'duration_sec'  432
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  10558405
                                           'mtime'  1620539193
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm music for maniacs prerock jb jazz unsorted
                                      'tag_artist'  Charlie Haden
                                     'tag_release'  Not In Our Name
                                       'tag_title'  amazing grace
                                             'bpm'  141.2
                                    'search_title'  'amazing':1 'grace':2
                                   'search_artist'  'charlie':1 'haden':2
                                  'search_release'  'in':2 'name':4 'not':1 'our':3
                                     'search_rest'  'for':2 'jazz':6 'jb':5 'maniacs':3 'music':1 'prerock':4 'unsorted':7
                                    'search_combo'  'amazing':1A 'charlie':3B 'for':10 'grace':2A 'haden':4B 'in':6C 'jazz':14 'jb':13 'maniacs':11 'music':9 'name':8C 'not':5C 'our':7C 'prerock':12 'unsorted':15
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  ['fip', 'bass', 'free jazz', 'jazz', 'jazz bass', 'modern jazz']
                                        'tag_date'  2005
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620539192.6952932  (2021-05-09 07:46:32)
                             'size'  10558405