======================== unified (from filesystem) ========================
                                         'bitrate'  '96.0'
                                        'duration'  '278'
                                          'artist'  'Preservation Hall Jazz Band'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  'The old rugged cross'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', 'Q-JZFKS-3', 'Q-UNU-1', "
 "'Q-OLDST-2', 'q-syn-1', 'Q-PLAY-3', 'q-bass-2', 'q-busy-3', 'q-grit-1', "
 "'Q-PIANO-2', 'q-chart-2', 'q-drums-1', 'q-other-3', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-o-dixiestyle'
                                             'bpm'  '84.987'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '84.987'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-o-dixiestyle'
'TIT2' (Title/songname/content description)         'The old rugged cross'
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Preservation Hall Jazz Band'
'TRCK' (Track number/Position in set)               '1'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.16 dB'
'TXXX:replaygain_track_peak'                        '0.802923'

========================== row from database ==========================
                                              'id'  1455651
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00jazz/Preservation Hall JB/The old rugged cross.mp3
                                         'working'  None
                                         'bitrate'  96
                                    'duration_sec'  278
                                           'genre'  prerock-jb-jazz-o-dixiestyle
                                        'filesize'  3343173
                                           'mtime'  1620523990
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00jazz JB prerock jb jazz dixiestyle
                                      'tag_artist'  Preservation Hall Jazz Band
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  The old rugged cross
                                             'bpm'  84.987
                                    'search_title'  'cross':4 'old':2 'rugged':3 'the':1
                                   'search_artist'  'band':4 'hall':2 'jazz':3 'preservation':1
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00jazz':5 'country':4 'dixiestyle':8 'exotica':2 'jazz':1 'jb':6 'oldies':3 'prerock':7
                                    'search_combo'  '00jazz':18 'album':10C 'band':8B 'country':17 'cross':4A 'dixiestyle':21 'exotica':15 'hall':6B 'jazz':7B,14 'jb':19 'non':9C 'nonalbum':11C 'old':2A 'oldies':16 'prerock':20 'preservation':5B 'rugged':3A 'the':1A 'tracks':12C,13C
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-2', 'q-grit-1']
                                      'lastfmtags'  ['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']
                                        'tag_date'  
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620523989.7209551  (2021-05-09 03:33:09)
                             'size'  3343173