======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '164'
                                          'artist'  'Slayer'
                                     'text_people'  ''
                                         'release'  'Reign In Blood'
                                           'title'  'Postmortem'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-2', 'q-busy-3', 'q-grit-4', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']"
                                     'discogstags'  "['rock', 'thrash', 'speed metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  ''
                                            'date'  '1986'
                                        'comments'  ''
                                           'genre'  'eid-metal-trash'
                                             'bpm'  '138.797'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Reign In Blood'
'TBPM' (BPM (beats per minute))                     '138.797'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-trash'
'TDRC' (Recording time)                             '1986'
'TIT2' (Title/songname/content description)         'Postmortem'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Slayer'
'TRCK' (Track number/Position in set)               '9'
'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:discogstags'                                  ['rock', 'thrash', 'speed metal']
'TXXX:lastfmtags'                                   ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '4'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.06 dB'
'TXXX:replaygain_track_peak'                        '0.593980'

========================== row from database ==========================
                                              'id'  1291254
                                            'path'  /data/Music/Bulk/00poprockelectronic/Slayer/Reign in Blood/Slayer - Postmortem - 09.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  164
                                           'genre'  eid-metal-trash
                                        'filesize'  2636490
                                           'mtime'  1620311749
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic in 09 eid metal trash
                                      'tag_artist'  Slayer
                                     'tag_release'  Reign In Blood
                                       'tag_title'  Postmortem
                                             'bpm'  138.797
                                    'search_title'  'postmortem':1
                                   'search_artist'  'slayer':1
                                  'search_release'  'blood':3 'in':2 'reign':1
                                     'search_rest'  '00poprockelectronic':1 'eid':3 'in':2 'metal':4 'trash':5
                                    'search_combo'  '00poprockelectronic':6 'blood':5C 'eid':8 'in':4C,7 'metal':9 'postmortem':1A 'reign':3C 'slayer':2B 'trash':10
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-4', 'Q-HAP-1', 'q-bass-2', 'q-grit-4']
                                      'lastfmtags'  ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
                                        'tag_date'  1986
                                     'discogstags'  ['rock', 'thrash', 'speed metal']

============================== file details ==============================
                                           'mtime'  1620311748.5199707  (2021-05-06 16:35:48)
                             'size'  2636490