======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '353'
                                          'artist'  'Eddy Huntington'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'U.S.S.R.'
                                           'quals'  "['q-bass-3', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1986'
                                        'comments'  ''
                                           'genre'  'pop,eighties,zomgeighties'
                                             'bpm'  '110.1'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '110.1'
'TCON' (Content type, a.k.a. Genre)                 'pop,eighties,zomgeighties'
'TDRC' (Recording time)                             '1986'
'TIT2' (Title/songname/content description)         'U.S.S.R.'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Eddy Huntington'
'TRCK' (Track number/Position in set)               '4'
'TXXX:q-bass'                                       '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.50 dB'
'TXXX:replaygain_track_peak'                        '0.745355'

========================== row from database ==========================
                                              'id'  1538583
                                            'path'  /data/Music/Other/PrevSet/[7zomgeighties]/Eddy Huntington - U.S.S.R..mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  353
                                           'genre'  pop,eighties,zomgeighties
                                        'filesize'  8492613
                                           'mtime'  1662800448
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [7zomgeighties] pop,eighties,zomgeighties
                                      'tag_artist'  Eddy Huntington
                                     'tag_release'  None
                                       'tag_title'  U.S.S.R.
                                             'bpm'  110.1
                                    'search_title'  'r':4 's':2,3 'u':1 'ussr':5
                                   'search_artist'  'eddy':1 'huntington':2
                                  'search_release'  
                                     'search_rest'  '7zomgeighties':2,3 'eighties':5,8 'pop':4,7 'prev':10 'prevset':1 'set':11 'zomgeighties':6,9
                                    'search_combo'  '7zomgeighties':9,10 'eddy':6B 'eighties':12,15 'huntington':7B 'pop':11,14 'prev':17 'prevset':8 'r':4A 's':2A,3A 'set':18 'u':1A 'ussr':5A 'zomgeighties':13,16
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['q-bass-3', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  1986
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800447.808158  (2022-09-10 11:00:47)
                             'size'  8492613