======================== unified (from filesystem) ========================
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                                        'duration'  '168'
                                          'artist'  'William Fitzsimmons'
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                                           'title'  'After Afterall'
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                                      'lastfmtags'  "['indie', 'acoustic', 'mellow', 'folk', 'singer songwriter']"
                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  ''
                                            'date'  '2009'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-indie'
                                             'bpm'  '135.819'
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                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter-indie'
'TDRC' (Recording time)                             '2009'
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'TIT2' (Title/songname/content description)         'After Afterall'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'William Fitzsimmons'
'TRCK' (Track number/Position in set)               '1'
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========================== row from database ==========================
                                              'id'  1268139
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/William Fitzsimmons/The Sparrow And The Crow/01 after afterall.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  168
                                           'genre'  ifs-songwriter-indie
                                        'filesize'  6752138
                                           'mtime'  1637330523
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                                     'tag_release'  The Sparrow and The Crow
                                       'tag_title'  After Afterall
                                             'bpm'  135.819
                                    'search_title'  'after':1 'afterall':2
                                   'search_artist'  'fitzsimmons':2 'william':1
                                  'search_release'  'and':3 'crow':4 'sparrow':2 'the':1
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                                    'tag_tracknum'  1
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                                             'key'  5B
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                                      'lastfmtags'  ['indie', 'acoustic', 'mellow', 'folk', 'singer songwriter']
                                        'tag_date'  2009
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637330523.4001799  (2021-11-19 15:02:03)
                             'size'  6752138