======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '30'
                                          'artist'  'Roger Roger'
                                     'text_people'  ''
                                         'release'  'Southern 45 rpm 1964 MQ 45-751'
                                           'title'  'Grotesque Polka'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-UNU-1', 'Q-OLDST-2', "
 "'q-syn-2', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', 'q-chart-2', "
 "'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-2', 'q-mixbeat-1']")
                                      'lastfmtags'  "['lounge', 'exotica', 'secretagent', 'library music', 'library']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'soundtrack-library'
                                             'bpm'  '94.32'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Southern 45 rpm 1964 MQ 45-751'
'TBPM' (BPM (beats per minute))                     '94.32'
'TCON' (Content type, a.k.a. Genre)                 'soundtrack-library'
'TIT2' (Title/songname/content description)         'Grotesque Polka'
'TKEY' (Initial key)                                '9A'
'TLEN' (Length)                                     '29000'
'TPE1' (Lead performer(s)/Soloist(s))               'Roger Roger'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['lounge', 'exotica', 'secretagent', 'library music', 'library']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+2.17 dB'
'TXXX:replaygain_track_peak'                        '0.566105'

========================== row from database ==========================
                                              'id'  1491484
                                            'path'  /data/Music/Bulk/00localcharacter/00mid-north-europe/00dutch/26 Grotesque Polka (Roger Roger).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  30
                                           'genre'  soundtrack-library
                                        'filesize'  482701
                                           'mtime'  1620331751
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 00mid north europe 00dutch 26 (Roger Roger) soundtrack library
                                      'tag_artist'  Roger Roger
                                     'tag_release'  Southern 45 rpm 1964 MQ 45-751
                                       'tag_title'  Grotesque Polka
                                             'bpm'  94.32
                                    'search_title'  'grotesque':1 'polka':2
                                   'search_artist'  'roger':1
                                  'search_release'  '1964':4 '45':2,6 '45751':8 '751':7 'mq':5 'rpm':3 'southern':1
                                     'search_rest'  '00dutch':4 '00mid':1 '26':5 'europe':3 'library':10 'north':2 'roger':6,7,8 'soundtrack':9
                                    'search_combo'  '00dutch':15 '00mid':12 '1964':7C '26':16 '45':5C,9C '45751':11C '751':10C 'europe':14 'grotesque':1A 'library':21 'mq':8C 'north':13 'polka':2A 'roger':3B,17,18,19 'rpm':6C 'soundtrack':20 'southern':4C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-piano-1', 'q-syn-2', 'q-chart-2', 'q-other-4', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['lounge', 'exotica', 'secretagent', 'library music', 'library']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620331750.9335914  (2021-05-06 22:09:10)
                             'size'  482701