======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '27'
                                          'artist'  ''
                                     'text_people'  ''
                                         'release'  'Shirley & Spinoza'
                                           'title'  'Urumqi KidsSing4'
                                           'quals'  ("['Q-OLDST-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-1', "
 "'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'set-pl-shirleyspinoza;set-pl-mor'
                                             'bpm'  '135.455'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Shirley & Spinoza'
'TBPM' (BPM (beats per minute))                     '135.455'
'TCON' (Content type, a.k.a. Genre)                 ['set-pl-shirleyspinoza', 'set-pl-shirleyspinoza', 'set-pl-mor']
'TIT2' (Title/songname/content description)         'Urumqi KidsSing4'
'TKEY' (Initial key)                                '5A'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Mp3gain_minmax'                               '140,195'
'TXXX:Mp3gain_undo'                                 '+001,+001,N'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:Sortunder'                                    '0-9'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.61 dB'
'TXXX:replaygain_track_peak'                        '0.834240'

========================== row from database ==========================
                                              'id'  859636
                                            'path'  /data/Music/Bulk/sns/urumqi/0414_Urumqi_KidsSing4.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  27
                                           'genre'  set-pl-shirleyspinoza;set-pl-mor
                                        'filesize'  446628
                                           'mtime'  1621044110
                                   'redo_metaread'  0
                                        'rest_str'   sns urumqi 0414_Urumqi_KidsSing4 set pl shirleyspinoza;set pl mor
                                      'tag_artist'  0414
                                     'tag_release'  Shirley & Spinoza
                                       'tag_title'  Urumqi KidsSing4
                                             'bpm'  135.455
                                    'search_title'  'kids':3 'kidssing4':2 'sing4':4 'urumqi':1
                                   'search_artist'  '0414':1
                                  'search_release'  'shirley':1 'spinoza':2
                                     'search_rest'  '0414':3,13 'kids':15 'kidssing4':5 'mor':12 'pl':7 'set':6,9,11 'shirleyspinoza':8,10 'sing4':16 'sns':1 'urumqi':2,4,14
                                    'search_combo'  '0414':9,19 'kids':3A,21 'kidssing4':2A,11 'mor':18 'pl':13 'set':12,15,17 'shirley':5C 'shirleyspinoza':14,16 'sing4':4A,22 'sns':7 'spinoza':6C 'urumqi':1A,8,10,20
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  5A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-1', 'q-other-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621044109.957341  (2021-05-15 04:01:49)
                             'size'  446628