======================== unified (from filesystem) ========================
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                                        'duration'  '531'
                                          'artist'  'Yo La Tengo'
                                     'text_people'  ''
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                                           'title'  'Daphnia'
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                                      'lastfmtags'  "['indie', 'indie pop', 'alternative', 'indie rock', 'rock']"
                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '15'
                                            'date'  '2006'
                                        'comments'  ''
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'TBPM' (BPM (beats per minute))                     '96.438'
'TCON' (Content type, a.k.a. Genre)                 ['ifs-songwriter-indie-unsorted', 'ifs-songwriter-indie-pop', 'rock-pop-indie']
'TDRC' (Recording time)                             '2006'
'TENC' (Encoded by)                                 'iTunes v6.0.5'
'TIT2' (Title/songname/content description)         'Daphnia'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Yo La Tengo'
'TRCK' (Track number/Position in set)               '9/15'
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'TXXX:Q-PIANO'                                      '3'
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'TXXX:lastfmtags'                                   ['indie', 'indie pop', 'alternative', 'indie rock', 'rock']
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========================== row from database ==========================
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                                         'working'  None
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                                    'duration_sec'  531
                                           'genre'  ifs-songwriter-indie-unsorted;ifs-songwriter-indie-pop;rock-pop-indie
                                        'filesize'  12755426
                                           'mtime'  1638544533
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                                       'tag_title'  Daphnia
                                             'bpm'  96.438
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                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-2', 'Q-PIANO-3', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-4', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['indie', 'indie pop', 'alternative', 'indie rock', 'rock']
                                        'tag_date'  2006
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1638544532.5907297  (2021-12-03 16:15:32)
                             'size'  12755426