======================== unified (from filesystem) ========================
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                                        'duration'  '110'
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                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '10'
                                      'tracktotal'  ''
                                            'date'  '1970'
                                        'comments'  ''
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                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'loc-m-israel'
'TDRC' (Recording time)                             '1970'
'TENC' (Encoded by)                                 'iTunes 10.1'
'TIT2' (Title/songname/content description)         'Marriage Blessing'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Tunisia'
'TRCK' (Track number/Position in set)               '10'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '4'
'TXXX:Q-OLDST'                                      '1'
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'TXXX:discogstags'                                  ['rock', 'classic rock']
'TXXX:lastfmtags'                                   ['electronic',
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 'progressive',
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00localcharacter/00south-europe-middle-east/Deben Bhattacharya - In Israel Today 3 (Westminster)/10.Marriage Blessing.mp3
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                                    'duration_sec'  110
                                           'genre'  loc-m-israel
                                        'filesize'  4062445
                                           'mtime'  1620526504
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                                       'tag_title'  Marriage Blessing
                                             'bpm'  139.562
                                    'search_title'  'blessing':2 'marriage':1
                                   'search_artist'  'tunisia':1
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                                    'search_combo'  '00south':10 '10':18 '10marriage':20 '3':8C 'bhattacharya':15 'blessing':2A 'deben':14 'east':13 'europe':11 'in':4C 'israel':5C,23 'loc':21 'm':22 'marriage':1A,19 'middle':12 'today':6C 'tunisia':3B 'vol':7C 'vol3':9C 'westminster':16,17
                                    'tag_tracknum'  10
                                      'num_images'  1
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-4', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
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                                        'tag_date'  1970
                                     'discogstags'  ['rock', 'classic rock']

============================== file details ==============================
                                           'mtime'  1620526504.1075642  (2021-05-09 04:15:04)
                             'size'  4062445