======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '141'
                                          'artist'  'Jim Croce'
                                     'text_people'  ''
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                                           'title'  'A Long Time Ago'
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                                      'lastfmtags'  "['rock', 'classic rock', '70s', 'folk', 'singer songwriter']"
                                     'discogstags'  "['folk, world, & country', 'soft rock', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '13'
                                      'tracktotal'  '18'
                                            'date'  '1994'
                                        'comments'  ''
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                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Time In A Bottle (His Greatest Hits)'
'TBPM' (BPM (beats per minute))                     '116.4'
'TCON' (Content type, a.k.a. Genre)                 ['ifs-songwriter', 'rock-cppex', 'ifs-songwriter-folk', 'ifs-songwriter-rock']
'TDRC' (Recording time)                             '1994'
'TIT2' (Title/songname/content description)         'A Long Time Ago'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Jim Croce'
'TPE2' (Band/orchestra/accompaniment)               'Jim Croce'
'TPOS' (Part of a set)                              '1/1'
'TRCK' (Track number/Position in set)               '13/18'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['folk, world, & country', 'soft rock', 'folk']
'TXXX:lastfmtags'                                   ['rock', 'classic rock', '70s', 'folk', 'singer songwriter']
'TXXX:q-bass'                                       '4'
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'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.59 dB'
'TXXX:replaygain_track_peak'                        '0.542181'

========================== row from database ==========================
                                              'id'  1249196
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Jim Croce - his greatest hits/13 A long time ago.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  141
                                           'genre'  ifs-songwriter;rock-cppex;ifs-songwriter-folk;ifs-songwriter-rock
                                        'filesize'  3402123
                                           'mtime'  1636401276
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos his greatest hits 13 long time ago ifs songwriter;rock cppex;ifs songwriter folk;ifs songwriter rock
                                      'tag_artist'  Jim Croce
                                     'tag_release'  Time In A Bottle (His Greatest Hits)
                                       'tag_title'  A Long Time Ago
                                             'bpm'  116.4
                                    'search_title'  'a':1 'ago':4 'long':2 'time':3
                                   'search_artist'  'croce':2 'jim':1
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                                    'search_combo'  '00singer':16 'a':1A,9C 'ago':4A,24 'bottle':10C 'cppex':30,32 'croce':6B 'eos':18 'folk':34,36 'greatest':13C,20 'his':11C,12C,19 'hits':14C,15C,21 'ifs':25,31,33,35,37 'in':8C 'jim':5B 'long':2A,22 'rock':27,29,38 'songwriter':17,26,28 'time':3A,7C,23
                                    'tag_tracknum'  13
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-3', 'q-other-3', 'Q-HAP-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['rock', 'classic rock', '70s', 'folk', 'singer songwriter']
                                        'tag_date'  1994
                                     'discogstags'  ['folk, world, & country', 'soft rock', 'folk']

============================== file details ==============================
                                           'mtime'  1636401276.3792543  (2021-11-08 20:54:36)
                             'size'  3402123