======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '195'
                                          'artist'  'Zhou Xuan'
                                     'text_people'  ''
                                         'release'  'The Legendary Chinese Hits Vol. 1'
                                           'title'  "A Mother's Heart"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'Q-LOCALNESS-3', 'q-syn-1', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '8'
                                      'tracktotal'  ''
                                            'date'  '1992'
                                        'comments'  ''
                                           'genre'  'loc-asia-china'
                                             'bpm'  '138.607'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            ' 0000048F 0000049D 00003C9A'
'COMM:iTunNORM:eng'                                 (' 0000048F 0000049D 00003C9A 00003D7F 00019B53 00019B53 00007379 000073D7 '
 '000152E0 000152E0')
'COMM:iTunPGAP:eng'                                 '1'
'COMM:iTunes_CDDB_IDs:eng'                          '15+9046EC21E893B720DF58050A4EA6F00B+3711787'
'TALB' (Album/Movie/Show title)                     'The Legendary Chinese Hits Vol. 1'
'TBPM' (BPM (beats per minute))                     '138.607'
'TCON' (Content type, a.k.a. Genre)                 'loc-asia-china'
'TDRC' (Recording time)                             '1992'
'TENC' (Encoded by)                                 'iTunes v4.6'
'TIT2' (Title/songname/content description)         "A Mother's Heart"
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Zhou Xuan'
'TPOS' (Part of a set)                              '1/5'
'TRCK' (Track number/Position in set)               '8'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.29 dB'
'TXXX:replaygain_track_peak'                        '0.534289'

========================== row from database ==========================
                                              'id'  1509806
                                            'path'  /data/Music/Bulk/00localcharacter/00asia/The Legendary Chinese Hits/1-08 A Mother_s Heart.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  195
                                           'genre'  loc-asia-china
                                        'filesize'  5246802
                                           'mtime'  1621629159
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 00asia 08 Mother_s loc asia china
                                      'tag_artist'  Zhou Xuan
                                     'tag_release'  The Legendary Chinese Hits Vol. 1
                                       'tag_title'  A Mother's Heart
                                             'bpm'  138.607
                                    'search_title'  'a':1 'heart':5 'mother':2 'mothers':4 's':3
                                   'search_artist'  'xuan':2 'zhou':1
                                  'search_release'  '1':7 'chinese':3 'hits':4 'legendary':2 'the':1 'vol':5,6
                                     'search_rest'  '00asia':1 'asia':5 'china':6 'loc':4 'mother':2 's':3
                                    'search_combo'  '00asia':15 '1':14C 'a':1A 'asia':19 'china':20 'chinese':10C 'heart':5A 'hits':11C 'legendary':9C 'loc':18 'mother':2A,16 'mothers':4A 's':3A,17 'the':8C 'vol':12C,13C 'xuan':7B 'zhou':6B
                                    'tag_tracknum'  8
                                      'num_images'  1
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
                                        'tag_date'  1992
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621629159.3834517  (2021-05-21 22:32:39)
                             'size'  5246802