======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '274'
                                          'artist'  'vae'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'sing, silverduck, sing'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'q-syn-3', 'q-bass-1', 'q-busy-2', "
 "'q-grit-2', 'q-play-2', 'Q-OLDST-3', 'q-chart-1', 'q-drums-4', 'q-other-3', "
 "'q-piano-1', 'q-vocals-1', 'Q-HHRNBTT-1', 'q-mixbeat-2', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  "['pop', 'c-pop', 'mandopop', 'mandarin', 'electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-beats'
                                             'bpm'  '99.080'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '99.080'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-beats'
'TDRC' (Recording time)                             '2000'
'TIT2' (Title/songname/content description)         'sing, silverduck, sing'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'vae'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['pop', 'c-pop', 'mandopop', 'mandarin', 'electronic']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.94 dB'
'TXXX:replaygain_track_peak'                        '0.655807'

========================== row from database ==========================
                                              'id'  147785
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/monotonik/monotonik-archives-vol-1/[mtk044]-vae-sing-silverduck-sing.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  274
                                           'genre'  electronic-generic or radio-beats
                                        'filesize'  4390478
                                           'mtime'  1620543626
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm monotonik monotonik archives vol 1 [mtk044] electronic generic or radio beats
                                      'tag_artist'  vae
                                     'tag_release'  None
                                       'tag_title'  sing, silverduck, sing
                                             'bpm'  99.08
                                    'search_title'  'silverduck':3,4 'sing':1,2
                                   'search_artist'  'vae':1
                                  'search_release'  
                                     'search_rest'  '1':4 'archives':2 'beats':11 'electronic':7 'generic':8 'monotonik':1 'mtk044':5,6 'or':9 'radio':10 'vol':3
                                    'search_combo'  '1':9 'archives':7 'beats':16 'electronic':12 'generic':13 'monotonik':6 'mtk044':10,11 'or':14 'radio':15 'silverduck':3A,4A 'sing':1A,2A 'vae':5B 'vol':8
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-4', 'q-syn-3', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['pop', 'c-pop', 'mandopop', 'mandarin', 'electronic']
                                        'tag_date'  2000
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620543626.401866  (2021-05-09 09:00:26)
                             'size'  4390478