======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '186'
                                          'artist'  'Charlotte Church'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Summertime from Porgy and Bess'
                                           'quals'  ("['Q-HAP-2', 'Q-OLDST-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', "
 "'Q-HHRNBTT-1', 'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'opera', 'female vocalists', 'pop', 'christmas']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '144.130'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '144.130'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Summertime from Porgy and Bess'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Charlotte Church'
'TXXX:Mp3gain_minmax'                               '000,193'
'TXXX:Mp3gain_undo'                                 '+002,+002,N'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['classical', 'opera', 'female vocalists', 'pop', 'christmas']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.49 dB'
'TXXX:replaygain_track_peak'                        '0.503381'

========================== row from database ==========================
                                              'id'  1336239
                                            'path'  /data/Music/Bulk/00poprockelectronic/Unsorted/[loose files]/Charlotte Church - Summertime from Porgy and Bess.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  186
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  2986347
                                           'mtime'  1637329820
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Unsorted [loose files] prerock classical classical instruments
                                      'tag_artist'  Charlotte Church
                                     'tag_release'  None
                                       'tag_title'  Summertime from Porgy and Bess
                                             'bpm'  144.13
                                    'search_title'  'and':4 'bess':5 'from':2 'porgy':3 'summertime':1
                                   'search_artist'  'charlotte':1 'church':2
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 'classical':8 'files':5,6 'instruments':9 'loose':3,4 'prerock':7 'unsorted':2
                                    'search_combo'  '00poprockelectronic':8 'and':4A 'bess':5A 'charlotte':6B 'church':7B 'classical':15 'files':12,13 'from':2A 'instruments':16 'loose':10,11 'porgy':3A 'prerock':14 'summertime':1A 'unsorted':9
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-2', 'q-other-3', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'opera', 'female vocalists', 'pop', 'christmas']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329819.7084634  (2021-11-19 14:50:19)
                             'size'  2986347