======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '120'
                                          'artist'  'Flatt & Scruggs'
                                     'text_people'  ''
                                         'release'  'Shirley & Spinoza'
                                           'title'  'Lonesome Road Blues'
                                           'quals'  ("['Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-2', 'Q-OLDST-1', "
 "'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-1', "
 "'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-1']")
                                      'lastfmtags'  "['bluegrass', 'country', 'folk', 'classic country', 'americana']"
                                     'discogstags'  "['folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  '12'
                                            'date'  '1961'
                                        'comments'  ''
                                           'genre'  'set-pl-shirleyspinoza;set-pl-mor'
                                             'bpm'  '119.829'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            ' 00000EEE 000002E0 0000A183'
'COMM:iTunNORM:eng'                                 (' 00000EEE 000002E0 0000A183 00002126 000155BC 0000F343 00007143 000069A2 '
 '00000329 00004514')
'COMM:iTunes_CDDB_IDs:eng'                          '12+703A6B410FAAF2C9C5E8BC1168E1095F+187702'
'TALB' (Album/Movie/Show title)                     'Shirley & Spinoza'
'TBPM' (BPM (beats per minute))                     '119.829'
'TCON' (Content type, a.k.a. Genre)                 ['set-pl-shirleyspinoza', 'set-pl-shirleyspinoza', 'set-pl-mor']
'TDRC' (Recording time)                             '1961'
'TENC' (Encoded by)                                 'iTunes v4.9.0.17'
'TIT2' (Title/songname/content description)         'Lonesome Road Blues'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Flatt & Scruggs'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TRCK' (Track number/Position in set)               '7/12'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'folk, world, & country'
'TXXX:lastfmtags'                                   ['bluegrass', 'country', 'folk', 'classic country', 'americana']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.06 dB'
'TXXX:replaygain_track_peak'                        '0.519083'

========================== row from database ==========================
                                              'id'  949283
                                            'path'  /data/Music/Bulk/sns/Lester Flatt & Earl Scruggs - Lonesome Road Blues.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  120
                                           'genre'  set-pl-shirleyspinoza;set-pl-mor
                                        'filesize'  2450762
                                           'mtime'  1621044084
                                   'redo_metaread'  0
                                        'rest_str'   sns Lester Earl set pl shirleyspinoza;set pl mor
                                      'tag_artist'  Flatt & Scruggs
                                     'tag_release'  Shirley & Spinoza
                                       'tag_title'  Lonesome Road Blues
                                             'bpm'  119.829
                                    'search_title'  'blues':3 'lonesome':1 'road':2
                                   'search_artist'  'flatt':1 'scruggs':2
                                  'search_release'  'shirley':1 'spinoza':2
                                     'search_rest'  'earl':3 'lester':2 'mor':10 'pl':5 'set':4,7,9 'shirleyspinoza':6,8 'sns':1
                                    'search_combo'  'blues':3A 'earl':10 'flatt':4B 'lester':9 'lonesome':1A 'mor':17 'pl':12 'road':2A 'scruggs':5B 'set':11,14,16 'shirley':6C 'shirleyspinoza':13,15 'sns':8 'spinoza':7C
                                    'tag_tracknum'  7
                                      'num_images'  1
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-1', 'q-other-4', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['bluegrass', 'country', 'folk', 'classic country', 'americana']
                                        'tag_date'  1961
                                     'discogstags'  ['folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621044083.6090908  (2021-05-15 04:01:23)
                             'size'  2450762