======================== unified (from filesystem) ========================
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                                        'duration'  '179'
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                                      'lastfmtags'  "['acoustic', 'blues', '60s', 'folk', 'singer songwriter']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  '17'
                                            'date'  '1968'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter'
                                             'bpm'  '124.0'
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                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter'
'TDRC' (Recording time)                             '1968'
'TENC' (Encoded by)                                 'iTunes v6.0.4.2'
'TIT2' (Title/songname/content description)         'Turn The Page'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Tim Hardin'
'TPOS' (Part of a set)                              '1/1'
'TRCK' (Track number/Position in set)               '3/17'
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'TXXX:Q-LOCALNESS'                                  '1'
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'TXXX:Q-PIANO'                                      '2'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Tim Hardin/Simple Songs Of Freedom/Tim Hardin - 03 Turn The Page.mp3
                                         'working'  None
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                                    'duration_sec'  179
                                           'genre'  ifs-songwriter
                                        'filesize'  4309296
                                           'mtime'  1636401446
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                                      'tag_artist'  Tim Hardin
                                     'tag_release'  Simple Songs Of Freedom - The Tim Hardin Collection
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                                             'bpm'  124.0
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                                   'search_artist'  'hardin':2 'tim':1
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                                    'tag_tracknum'  3
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                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-2', 'q-other-3', 'Q-HAP-2', 'Q-PLAY-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['acoustic', 'blues', '60s', 'folk', 'singer songwriter']
                                        'tag_date'  1968
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636401446.1484184  (2021-11-08 20:57:26)
                             'size'  4309296