======================== unified (from filesystem) ========================
                                         'bitrate'  '188.081'
                                        'duration'  '206'
                                          'artist'  'The Knife'
                                     'text_people'  ''
                                         'release'  'The Knife'
                                           'title'  'A Lung'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-3', 'q-bass-2', 'q-busy-3', 'q-grit-2', 'q-play-4', "
 "'q-chart-4', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-3']")
                                      'lastfmtags'  "['swedish', 'electronica', 'poptron', 'electronic', 'synthpop']"
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '10'
                                      'tracktotal'  ''
                                            'date'  '2004'
                                        'comments'  ''
                                           'genre'  'electronic-we-electropop or synthpop'
                                             'bpm'  '104.931'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Knife'
'TBPM' (BPM (beats per minute))                     '104.931'
'TCON' (Content type, a.k.a. Genre)                 'electronic-we-electropop or synthpop'
'TDRC' (Recording time)                             '2004'
'TIT2' (Title/songname/content description)         'A Lung'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Knife'
'TRCK' (Track number/Position in set)               '10'
'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:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['swedish', 'electronica', 'poptron', 'electronic', 'synthpop']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '3'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '4'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.07 dB'
'TXXX:replaygain_track_peak'                        '0.438560'

========================== row from database ==========================
                                              'id'  1456330
                                            'path'  /data/Music/Bulk/00poprockelectronic/The Knife/The Knife/The Knife - The Knife - 10 - A Lung.mp3
                                         'working'  None
                                         'bitrate'  188
                                    'duration_sec'  206
                                           'genre'  electronic-we-electropop or synthpop
                                        'filesize'  4858675
                                           'mtime'  1628353764
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 10 electronic we electropop or synthpop
                                      'tag_artist'  The Knife
                                     'tag_release'  The Knife
                                       'tag_title'  A Lung
                                             'bpm'  104.931
                                    'search_title'  'a':1 'lung':2
                                   'search_artist'  'knife':2 'the':1
                                  'search_release'  'knife':2 'the':1
                                     'search_rest'  '00poprockelectronic':1 'electronic':2 'electropop':4 'or':5 'synthpop':6 'we':3
                                    'search_combo'  '00poprockelectronic':7 'a':1A 'electronic':8 'electropop':10 'knife':4B,6C 'lung':2A 'or':11 'synthpop':12 'the':3B,5C 'we':9
                                    'tag_tracknum'  10
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-3', 'q-play-4', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-3', 'q-chart-4', 'q-other-2', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['swedish', 'electronica', 'poptron', 'electronic', 'synthpop']
                                        'tag_date'  2004
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1628353763.884217  (2021-08-07 18:29:23)
                             'size'  4858675