======================== unified (from filesystem) ========================
                                         'bitrate'  '194.088'
                                        'duration'  '257'
                                          'artist'  'Black Sabbath'
                                     'text_people'  ''
                                         'release'  'The Best Of ... CD2'
                                           'title'  'Am I Going Insane (Radio)'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classic rock', 'rock', 'hard rock', 'metal', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '10'
                                      'tracktotal'  '16'
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'eid-metal-heavy'
                                             'bpm'  '136.828'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Best Of ... CD2'
'TBPM' (BPM (beats per minute))                     '136.828'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-heavy'
'TDRC' (Recording time)                             '2000'
'TENC' (Encoded by)                                 'Exact Audio Copy   (Secure mode)'
'TIT2' (Title/songname/content description)         'Am I Going Insane (Radio)'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'Black Sabbath'
'TRCK' (Track number/Position in set)               '10/16'
'TXXX:Q-HAP'                                        '1'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['classic rock', 'rock', 'hard rock', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.21 dB'
'TXXX:replaygain_track_peak'                        '0.505969'

========================== row from database ==========================
                                              'id'  1394659
                                            'path'  /data/Music/Bulk/00dwimp/00metal/Black Sabbath/The Best of Black Sabbath/Disc2_10_-Am_I_Going_Insane_(Radio).mp3
                                         'working'  None
                                         'bitrate'  194
                                    'duration_sec'  257
                                           'genre'  eid-metal-heavy
                                        'filesize'  6243442
                                           'mtime'  1620311068
                                   'redo_metaread'  0
                                        'rest_str'   00dwimp 00metal of Disc2_10_ Am_I_Going_Insane_(Radio) eid metal heavy
                                      'tag_artist'  Black Sabbath
                                     'tag_release'  The Best Of ... CD2
                                       'tag_title'  Am I Going Insane (Radio)
                                             'bpm'  136.828
                                    'search_title'  'am':1 'going':3 'i':2 'insane':4 'radio':5,6
                                   'search_artist'  'black':1 'sabbath':2
                                  'search_release'  'best':2 'cd2':4 'of':3 'the':1
                                     'search_rest'  '00dwimp':1 '00metal':2 '10':5 'am':6,11 'disc2':4 'eid':16 'going':8,13 'heavy':18 'i':7,12 'insane':9,14 'metal':17 'of':3 'radio':10,15
                                    'search_combo'  '00dwimp':13 '00metal':14 '10':17 'am':1A,18,23 'best':10C 'black':7B 'cd2':12C 'disc2':16 'eid':28 'going':3A,20,25 'heavy':30 'i':2A,19,24 'insane':4A,21,26 'metal':29 'of':11C,15 'radio':5A,6A,22,27 'sabbath':8B 'the':9C
                                    'tag_tracknum'  10
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-1', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['classic rock', 'rock', 'hard rock', 'metal', 'heavy metal']
                                        'tag_date'  2000
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620311067.5479026  (2021-05-06 16:24:27)
                             'size'  6243442