======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '288'
                                          'artist'  'Iron Maiden'
                                     'text_people'  ''
                                         'release'  'The Number Of The Beast'
                                           'title'  'The Number Of The Beast'
                                           'quals'  ("['Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['nwobhm', 'rock', 'hard rock', 'metal', 'heavy metal']"
                                     'discogstags'  "['rock', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1982'
                                        'comments'  ''
                                           'genre'  'eid-metal'
                                             'bpm'  '135.184'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Number Of The Beast'
'TBPM' (BPM (beats per minute))                     '135.184'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal'
'TDRC' (Recording time)                             '1982'
'TIT2' (Title/songname/content description)         'The Number Of The Beast'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Iron Maiden'
'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', 'heavy metal']
'TXXX:lastfmtags'                                   ['nwobhm', 'rock', 'hard rock', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.99 dB'
'TXXX:replaygain_track_peak'                        '0.568478'

========================== row from database ==========================
                                              'id'  1393237
                                            'path'  /data/Music/Bulk/00dwimp/00metal/Iron Maiden vs Bob Marley - Iron Maiden/Best of the Beast/Iron Maiden - The Number of the Beast.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  288
                                           'genre'  eid-metal
                                        'filesize'  4620160
                                           'mtime'  1620300830
                                   'redo_metaread'  0
                                        'rest_str'   00dwimp 00metal vs Bob Marley Best of the of the eid metal
                                      'tag_artist'  Iron Maiden
                                     'tag_release'  The Number Of The Beast
                                       'tag_title'  The Number Of The Beast
                                             'bpm'  135.184
                                    'search_title'  'beast':4 'number':2 'of':3 'the':1
                                   'search_artist'  'iron':1 'maiden':2
                                  'search_release'  'beast':4 'number':2 'of':3 'the':1
                                     'search_rest'  '00dwimp':1 '00metal':2 'best':6 'bob':4 'eid':9 'marley':5 'metal':10 'of':7 'the':8 'vs':3
                                    'search_combo'  '00dwimp':11 '00metal':12 'beast':4A,10C 'best':16 'bob':14 'eid':19 'iron':5B 'maiden':6B 'marley':15 'metal':20 'number':2A,8C 'of':3A,9C,17 'the':1A,7C,18 'vs':13
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7A
                                           '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-4', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-1', 'q-bass-4', 'q-grit-3']
                                      'lastfmtags'  ['nwobhm', 'rock', 'hard rock', 'metal', 'heavy metal']
                                        'tag_date'  1982
                                     'discogstags'  ['rock', 'heavy metal']

============================== file details ==============================
                                           'mtime'  1620300829.927426  (2021-05-06 13:33:49)
                             'size'  4620160