======================== unified (from filesystem) ========================
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '10'
                                            'date'  '2009'
                                        'comments'  ''
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                                        'acoustid'  ''
rest: ''

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'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter-indie-unsorted'
'TDRC' (Recording time)                             '2009'
'TENC' (Encoded by)                                 'iTunes v7.7.1'
'TIT2' (Title/songname/content description)         'A Teenager In Love'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Pains Of Being Pure At Heart'
'TRCK' (Track number/Position in set)               '8/10'
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'TXXX:replaygain_track_peak'                        '0.453980'

========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/The Pains Of Being Pure At Heart/The Pains Of Being Pure At Heart/08. a teenager in love.mp3
                                         'working'  None
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                                    'duration_sec'  202
                                           'genre'  ifs-songwriter-indie-unsorted
                                        'filesize'  6075509
                                           'mtime'  1642256575
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                                       'tag_title'  A Teenager In Love
                                             'bpm'  101.5
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                                    'tag_tracknum'  8
                                      'num_images'  1
                                             'key'  10A
                                           'quals'  ['Q-HAP-2', 'Q-UNU-1', 'Q-OLDST-3', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-3', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-1']
                                      'lastfmtags'  ['indie', 'indie pop', 'shoegaze', 'dream pop', 'twee']
                                        'tag_date'  2009
                                     'discogstags'  ['rock', 'pop', 'lo-fi', 'indie rock', 'shoegaze']

============================== file details ==============================
                                           'mtime'  1642256575.4133992  (2022-01-15 15:22:55)
                             'size'  6075509