======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '252'
                                          'artist'  'Charlie Louvin & Roy Acuff'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Precious Jewel'
                                           'quals'  ("['Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-1', "
 "'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'electronic-unsorted'
                                             'bpm'  '140.4'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:\x89)\x00\x00'                   PRIV(owner='AverageLevel', data=b'\x89)\x00\x00')
'PRIV:PeakValue:ÿ\x7f\x00\x00'                      PRIV(owner='PeakValue', data=b'\xff\x7f\x00\x00')
'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))                     '140.4'
'TCON' (Content type, a.k.a. Genre)                 'electronic-unsorted'
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         'Precious Jewel'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Charlie Louvin & Roy Acuff'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '-0.17 dB'
'TXXX:replaygain_track_peak'                        '0.326927'

========================== row from database ==========================
                                              'id'  1362457
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Roy Acuff - 1998 - A-138 - Essential  1936-1949/Acuff, Roy - Essential  - 15 - Charlie Louvin & Roy Acuff - Precious Jewel.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  252
                                           'genre'  electronic-unsorted
                                        'filesize'  4039840
                                           'mtime'  1620541852
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm 1998 138 Essential 1936 1949 Acuff, Essential 15 electronic unsorted
                                      'tag_artist'  Charlie Louvin & Roy Acuff
                                     'tag_release'  None
                                       'tag_title'  Precious Jewel
                                             'bpm'  140.4
                                    'search_title'  'jewel':2 'precious':1
                                   'search_artist'  'acuff':4 'charlie':1 'louvin':2 'roy':3
                                  'search_release'  
                                     'search_rest'  '138':2 '1936':4 '1949':5 '1998':1 'acuff':6,7 'electronic':8 'essential':3 'unsorted':9
                                    'search_combo'  '138':8 '1936':10 '1949':11 '1998':7 'acuff':6B,12,13 'charlie':3B 'electronic':14 'essential':9 'jewel':2A 'louvin':4B 'precious':1A 'roy':5B 'unsorted':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-1', 'q-other-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1998
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620541852.1477556  (2021-05-09 08:30:52)
                             'size'  4039840