======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '123'
                                          'artist'  'Rick Nelson'
                                     'text_people'  'Dorsey Burnette/Johnny Burnette'
                                         'release'  'Legendary Masters'
                                           'title'  "Waitin' In School"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['rock and roll', 'country', 'oldies', 'rockabilly', '50s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1958'
                                        'comments'  ''
                                           'genre'  'rock-pop-early-rockabilly'
                                             'bpm'  '102.853'
                                             'key'  '1B'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         '58-147 POS 18'
'COMM:ID3v1 Comment:XXX'                            '58-147 POS 18'
'TALB' (Album/Movie/Show title)                     'Legendary Masters'
'TBPM' (BPM (beats per minute))                     '102.853'
'TCOM' (Composer)                                   'Dorsey Burnette/Johnny Burnette'
'TCON' (Content type, a.k.a. Genre)                 'rock-pop-early-rockabilly'
'TDRC' (Recording time)                             '1958'
'TIT2' (Title/songname/content description)         "Waitin' In School"
'TKEY' (Initial key)                                '1B'
'TPE1' (Lead performer(s)/Soloist(s))               'Ricky Nelson'
'TPE2' (Band/orchestra/accompaniment)               'Rick Nelson'
'TPUB' (Publisher)                                  'Alliance'
'TRCK' (Track number/Position in set)               '4'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['rock and roll', 'country', 'oldies', 'rockabilly', '50s']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.18 dB'
'TXXX:replaygain_track_peak'                        '0.538995'

========================== row from database ==========================
                                              'id'  1507725
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1958/58-147 - Ricky Nelson - Waitin_ In School.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  123
                                           'genre'  rock-pop-early-rockabilly
                                        'filesize'  4951771
                                           'mtime'  1622659477
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1958 58 147 Ricky Waitin_ rock pop early rockabilly
                                      'tag_artist'  Rick Nelson
                                     'tag_release'  Legendary Masters
                                       'tag_title'  Waitin' In School
                                             'bpm'  102.853
                                    'search_title'  'in':3 'school':4 'waitin':1,2
                                   'search_artist'  'nelson':2 'rick':1
                                  'search_release'  'legendary':1 'masters':2
                                     'search_rest'  '00oldiepop':5 '147':8 '1958':6 '58':7 'country':4 'early':13 'exotica':2 'jazz':1 'oldies':3 'pop':12 'ricky':9 'rock':11 'rockabilly':14 'waitin':10
                                    'search_combo'  '00oldiepop':13 '147':16 '1958':14 '58':15 'country':12 'early':21 'exotica':10 'in':3A 'jazz':9 'legendary':7C 'masters':8C 'nelson':6B 'oldies':11 'pop':20 'rick':5B 'ricky':17 'rock':19 'rockabilly':22 'school':4A 'waitin':1A,2A,18
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  1B
                                           '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-3', 'q-syn-1', 'q-chart-1', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['rock and roll', 'country', 'oldies', 'rockabilly', '50s']
                                        'tag_date'  1958
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1622659476.664819  (2021-06-02 20:44:36)
                             'size'  4951771