======================== unified (from filesystem) ========================
                                         'bitrate'  '128.692'
                                        'duration'  '93'
                                          'artist'  'Monty Python'
                                     'text_people'  ''
                                         'release'  'The Monty Python Instant Recor'
                                           'title'  'Camelot'
                                           'quals'  ("['Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-OLDST-3', 'Q-UNU-2', 'Q-HHRNBTT-1', "
 "'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-2', "
 "'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-2']")
                                      'lastfmtags'  "['soundtrack', 'funny', 'comedy', 'humour', 'british']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1980'
                                        'comments'  ''
                                           'genre'  'entertaining-unsorted'
                                             'bpm'  '145.163'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Monty Python Instant Recor'
'TBPM' (BPM (beats per minute))                     '145.163'
'TCON' (Content type, a.k.a. Genre)                 'entertaining-unsorted'
'TDRC' (Recording time)                             '1980'
'TIT2' (Title/songname/content description)         'Camelot'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Monty Python'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['soundtrack', 'funny', 'comedy', 'humour', 'british']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.68 dB'
'TXXX:replaygain_track_peak'                        '0.408520'

========================== row from database ==========================
                                              'id'  1336379
                                            'path'  /data/Music/Bulk/00spent/Unsorted/MBZ;#Monty Python;#The Monty Python Instant Record Collection;#07;#Camelot.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  93
                                           'genre'  entertaining-unsorted
                                        'filesize'  1510605
                                           'mtime'  1620647372
                                   'redo_metaread'  0
                                        'rest_str'   00spent Unsorted MBZ;#Monty Python;#The Record Collection;#07;#Camelot entertaining unsorted
                                      'tag_artist'  Monty Python
                                     'tag_release'  The Monty Python Instant Recor
                                       'tag_title'  Camelot
                                             'bpm'  145.163
                                    'search_title'  'camelot':1
                                   'search_artist'  'monty':1 'python':2
                                  'search_release'  'instant':4 'monty':2 'python':3 'recor':5 'the':1
                                     'search_rest'  '00spent':1 '07':13,16 'camelot':14,17 'collection':12,15 'entertaining':18 'mbz':3,5 'monty':4,6 'python':7,9 'record':11 'the':8,10 'unsorted':2
                                    'search_combo'  '00spent':9 '07':21,24 'camelot':1A,22,25 'collection':20,23 'entertaining':26 'instant':7C 'mbz':11,13 'monty':2B,5C,12,14 'python':3B,6C,15,17 'recor':8C 'record':19 'the':4C,16,18 'unsorted':10
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-2', 'q-other-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['soundtrack', 'funny', 'comedy', 'humour', 'british']
                                        'tag_date'  1980
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620647371.757138  (2021-05-10 13:49:31)
                             'size'  1510605