======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '376'
                                          'artist'  'Megadeth'
                                     'text_people'  ''
                                         'release'  'Maximum Megadeth'
                                           'title'  'In My Darkest Hour'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HAP-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-3', 'q-play-2', "
 "'q-chart-4', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']"
                                     'discogstags'  "['rock', 'thrash', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  '8'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'eid-metal-trash'
                                             'bpm'  '112'
                                             'key'  '3A'
                                        'acoustid'  '0eb03483-b636-4bf0-b847-3936e7bda94d'
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Maximum Megadeth'
'TBPM' (BPM (beats per minute))                     '112'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-trash'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991'
'TIT2' (Title/songname/content description)         'In My Darkest Hour'
'TKEY' (Initial key)                                '3A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Megadeth'
'TPE2' (Band/orchestra/accompaniment)               'Megadeth'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Capitol Records'
'TRCK' (Track number/Position in set)               '3/8'
'TSO2'                                              'Megadeth'
'TSOP' (Performer sort order)                       'Megadeth'
'TSRC' (ISRC (international standard recording code))  'USCA20001221'
'TXXX:ASIN'                                         'B001JQ4QWW'
'TXXX:Acoustid Id'                                  '0eb03483-b636-4bf0-b847-3936e7bda94d'
'TXXX:Artists'                                      'Megadeth'
'TXXX:CATALOGNUMBER'                                'DPRO-79757'
'TXXX:Mp3gain_minmax'                               '143,195'
'TXXX:Mp3gain_undo'                                 '+004,+004,N'
'TXXX:MusicBrainz Album Artist Id'                  'a9044915-8be3-4c7e-b11f-9e2d2ea0a91e'
'TXXX:MusicBrainz Album Id'                         '7a4a27ce-730b-4dc2-b2f0-9fe1f1dfc009'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'promotion'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
'TXXX:MusicBrainz Artist Id'                        'a9044915-8be3-4c7e-b11f-9e2d2ea0a91e'
'TXXX:MusicBrainz Release Group Id'                 '65267a90-5d26-3d0e-b6a6-b11bacd6c778'
'TXXX:MusicBrainz Release Track Id'                 'a53e8164-aaba-3904-939a-8e289a75a1eb'
'TXXX:Q-HAP'                                        '1'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  ['rock', 'thrash', 'heavy metal']
'TXXX:lastfmtags'                                   ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
'TXXX:originalyear'                                 '1991'
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.26 dB'
'TXXX:replaygain_track_peak'                        '0.527499'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'269176e5-4868-4d3c-8b25-6c69a194277f')

========================== row from database ==========================
                                              'id'  1402250
                                            'path'  /data/Music/Bulk/00dwimp/00metal/Megadeth/_Onbekend_/In My Darkest Hour.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  376
                                           'genre'  eid-metal-trash
                                        'filesize'  6109017
                                           'mtime'  1620311617
                                   'redo_metaread'  0
                                        'rest_str'   00dwimp 00metal _Onbekend_ eid metal trash
                                      'tag_artist'  Megadeth
                                     'tag_release'  Maximum Megadeth
                                       'tag_title'  In My Darkest Hour
                                             'bpm'  112.0
                                    'search_title'  'darkest':3 'hour':4 'in':1 'my':2
                                   'search_artist'  'megadeth':1
                                  'search_release'  'maximum':1 'megadeth':2
                                     'search_rest'  '00dwimp':1 '00metal':2 'eid':4 'metal':5 'onbekend':3 'trash':6
                                    'search_combo'  '00dwimp':8 '00metal':9 'darkest':3A 'eid':11 'hour':4A 'in':1A 'maximum':6C 'megadeth':5B,7C 'metal':12 'my':2A 'onbekend':10 'trash':13
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-1', 'q-bass-3', 'q-grit-3']
                                      'lastfmtags'  ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
                                        'tag_date'  1991
                                     'discogstags'  ['rock', 'thrash', 'heavy metal']

============================== file details ==============================
                                           'mtime'  1620311617.011155  (2021-05-06 16:33:37)
                             'size'  6109017