======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '289'
                                          'artist'  'Deben Bhattacharya'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Ballad'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-3', 'Q-LOCALNESS-4', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['traditional', 'ethnic', 'world music', 'folk', 'ethnomusicologist']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  'A2'
                                      'tracktotal'  ''
                                            'date'  '1972'
                                        'comments'  ''
                                           'genre'  'loc-unsorted'
                                             'bpm'  '143.925'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:{\x08\x00\x00'                   PRIV(owner='AverageLevel', data=b'{\x08\x00\x00')
'PRIV:PeakValue:¡j\x00\x00'                         PRIV(owner='PeakValue', data=b'\xa1j\x00\x00')
'TBPM' (BPM (beats per minute))                     '143.925'
'TCON' (Content type, a.k.a. Genre)                 'loc-unsorted'
'TDRC' (Recording time)                             '1972'
'TIT2' (Title/songname/content description)         'Ballad'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Deben Bhattacharya'
'TRCK' (Track number/Position in set)               'A2'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '4'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '3'
'TXXX:lastfmtags'                                   ['traditional', 'ethnic', 'world music', 'folk', 'ethnomusicologist']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.97 dB'
'TXXX:replaygain_track_peak'                        '0.494420'

========================== row from database ==========================
                                              'id'  1239055
                                            'path'  /data/Music/Bulk/00localcharacter/00south-europe-middle-east/Deben Bhattacharya - Songs and Dances from Czechoslovakia (Argo ZFB 59, 1972)/A2 Ballad.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  289
                                           'genre'  loc-unsorted
                                        'filesize'  11584699
                                           'mtime'  1621627073
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 00south europe middle east Songs and Dances from Czechoslovakia (Argo ZFB 59, 1972) A2 loc unsorted
                                      'tag_artist'  Deben Bhattacharya
                                     'tag_release'  None
                                       'tag_title'  Ballad
                                             'bpm'  143.925
                                    'search_title'  'ballad':1
                                   'search_artist'  'bhattacharya':2 'deben':1
                                  'search_release'  
                                     'search_rest'  '00south':1 '1972':15,16 '59':13,14 'a2':17 'and':6 'argo':10,11 'czechoslovakia':9 'dances':7 'east':4 'europe':2 'from':8 'loc':18 'middle':3 'songs':5 'unsorted':19 'zfb':12
                                    'search_combo'  '00south':4 '1972':18,19 '59':16,17 'a2':20 'and':9 'argo':13,14 'ballad':1A 'bhattacharya':3B 'czechoslovakia':12 'dances':10 'deben':2B 'east':7 'europe':5 'from':11 'loc':21 'middle':6 'songs':8 'unsorted':22 'zfb':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-4', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['traditional', 'ethnic', 'world music', 'folk', 'ethnomusicologist']
                                        'tag_date'  1972
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627073.333636  (2021-05-21 21:57:53)
                             'size'  11584699