======================== unified (from filesystem) ========================
                                         'bitrate'  '96.0'
                                        'duration'  '159'
                                          'artist'  '[unknown]'
                                     'text_people'  ''
                                         'release'  "Murderers'home"
                                           'title'  'Katy Left Memphis'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-2', 'Q-UNU-2', 'Q-HHRNBTT-1', "
 "'Q-LOCALNESS-3', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-2', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '03'
                                      'tracktotal'  ''
                                            'date'  '1996'
                                        'comments'  ''
                                           'genre'  'loc-namerica'
                                             'bpm'  '121.848'
                                             'key'  '11A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     "Murderers'home"
'TBPM' (BPM (beats per minute))                     '121.848'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica'
'TDRC' (Recording time)                             '1996'
'TIT2' (Title/songname/content description)         'Katy Left Memphis'
'TKEY' (Initial key)                                '11A'
'TPE1' (Lead performer(s)/Soloist(s))               '[unknown]'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '03'
'TXXX:Mp3gain_minmax'                               '139,180'
'TXXX:Mp3gain_undo'                                 '-001,-001,N'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '2'
'TXXX:Tracknum'                                     '03'
'TXXX:other'                                        "Murderers'home"
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+4.25 dB'
'TXXX:replaygain_track_peak'                        '0.932748'

========================== row from database ==========================
                                              'id'  1533128
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/Murderers_ home ~ Negro Worksongs (Sequel Records, 1996) [96k]/Murderers_home - 03.Pro.mp3
                                         'working'  None
                                         'bitrate'  96
                                    'duration_sec'  159
                                           'genre'  loc-namerica
                                        'filesize'  1918065
                                           'mtime'  1621629884
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. World 1： Trad Murderers_ ~ Negro Worksongs (Sequel Records, 1996) [96k] Murderers_home 03.Pro loc namerica
                                      'tag_artist'  [unknown]
                                     'tag_release'  Murderers'home
                                       'tag_title'  Katy Left Memphis
                                             'bpm'  121.848
                                    'search_title'  'katy':1 'left':2 'memphis':3
                                   'search_artist'  'unknown':1,2
                                  'search_release'  'home':2 'murderers':1 'murderershome':3
                                     'search_rest'  '03':21 '03pro':23 '1':4,5,6 '1996':15,16 '96k':17,18 'home':20 'loc':24 'murderers':8,19 'namerica':25 'negro':9 'pro':22 'records':13,14 'sequel':11,12 'trad':7 'va':1,2 'worksongs':10 'world':3
                                    'search_combo'  '03':29 '03pro':31 '1':12,13,14 '1996':23,24 '96k':25,26 'home':7C,28 'katy':1A 'left':2A 'loc':32 'memphis':3A 'murderers':6C,16,27 'murderershome':8C 'namerica':33 'negro':17 'pro':30 'records':21,22 'sequel':19,20 'trad':15 'unknown':4B,5B 'va':9,10 'worksongs':18 'world':11
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  11A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1996
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621629883.984157  (2021-05-21 22:44:43)
                             'size'  1918065