======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '191'
                                          'artist'  'Tom Lehrer'
                                     'text_people'  ''
                                         'release'  'Songs & More Songs by Tom Lehrer'
                                           'title'  'Lobachevsky'
                                           'quals'  "['q-bass-1', 'q-drums-1', 'q-other-3', 'q-piano-2', 'q-vocals-4']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '06'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'Comedy'
                                             'bpm'  '143.9'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Songs & More Songs by Tom Lehrer'
'TBPM' (BPM (beats per minute))                     '143.9'
'TCON' (Content type, a.k.a. Genre)                 'Comedy'
'TENC' (Encoded by)                                 'rcg'
'TIT2' (Title/songname/content description)         'Lobachevsky'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Tom Lehrer'
'TPE2' (Band/orchestra/accompaniment)               'Tom Lehrer'
'TRCK' (Track number/Position in set)               '06'
'TXXX:q-bass'                                       '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '-0.41 dB'
'TXXX:replaygain_track_peak'                        '0.647467'

========================== row from database ==========================
                                              'id'  1538128
                                            'path'  /data/Music/Other/PrevSet/[9amusing]/Tom Lehrer/Lobachevsky.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  191
                                           'genre'  Comedy
                                        'filesize'  4594281
                                           'mtime'  1662800551
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9amusing] Comedy
                                      'tag_artist'  Tom Lehrer
                                     'tag_release'  Songs & More Songs by Tom Lehrer
                                       'tag_title'  Lobachevsky
                                             'bpm'  143.9
                                    'search_title'  'lobachevsky':1
                                   'search_artist'  'lehrer':2 'tom':1
                                  'search_release'  'by':3 'lehrer':5 'more':2 'songs':1 'tom':4
                                     'search_rest'  '9amusing':2,3 'comedy':4 'prev':5 'prevset':1 'set':6
                                    'search_combo'  '9amusing':10,11 'by':6C 'comedy':12 'lehrer':3B,8C 'lobachevsky':1A 'more':5C 'prev':13 'prevset':9 'set':14 'songs':4C 'tom':2B,7C
                                    'tag_tracknum'  6
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['q-bass-1', 'q-drums-1', 'q-other-3', 'q-piano-2', 'q-vocals-4']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800551.3048172  (2022-09-10 11:02:31)
                             'size'  4594281