<pre>
======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '480'
                                          'artist'  'Immortal'
                                     'text_people'  ''
                                         'release'  'At the Heart of Winter'
                                           'title'  'At the Heart of Winter'
                                           '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-4', 'q-play-2', "
 "'q-chart-3', 'q-drums-3', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['norwegian', 'true norwegian black metal', 'black metal', 'norwegian black "
 "metal']")
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  '6'
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'eid-metal-black'
                                             'bpm'  '146.000'
                                             'key'  '12B'
                                        'acoustid'  '0d95cdd5-9b6f-4109-81de-6db8fd945765'
rest: ''

======================== rawer (from filesystem) ========================<mutagen.mp3.MPEGInfo object at 0x7f95382f12e0>

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''<br/>                                     <img style="width:150px" src="image?fid=1390784"/>
'COMM:ID3v1 Comment:XXX'                            ' 00003881 0000384D 0000F80D'
'COMM:iTunNORM:eng'                                 (' 00003881 0000384D 0000F80D 0000C2AF 00055747 00055747 00008000 00008000 '
 '0001FBD0 0001FBD0')
'TALB' (Album/Movie/Show title)                     'At the Heart of Winter'
'TBPM' (BPM (beats per minute))                     '146.000'
'TCON' (Content type, a.k.a. Genre)                 'eid-metal-black'
'TDOR' (Original release time)                      '1999'
'TDRC' (Recording time)                             '2006-04-04'
'TIPL' (Involved people list)                       TIPL(encoding=&lt;Encoding.UTF16: 1&gt;, people=[['producer', 'Peter Tägtgren']])
'TIT2' (Title/songname/content description)         'At the Heart of Winter'
'TKEY' (Initial key)                                '12B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Immortal'
'TPE2' (Band/orchestra/accompaniment)               'Immortal'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Osmose Productions'
'TRCK' (Track number/Position in set)               '5/6'
'TSO2'                                              'Immortal'
'TSOP' (Performer sort order)                       'Immortal'
'TXXX:ASIN'                                         'B000EOTEPO'
'TXXX:Acoustid Id'                                  '0d95cdd5-9b6f-4109-81de-6db8fd945765'
'TXXX:BARCODE'                                      '654436207924'
'TXXX:CATALOGNUMBER'                                'OPCD 2079'
'TXXX:MusicBrainz Album Artist Id'                  'b863cf80-19c6-4a87-8e42-6cff7ac8f18f'
'TXXX:MusicBrainz Album Id'                         '8c8395a0-3a02-35d6-a975-535112ec057e'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        'b863cf80-19c6-4a87-8e42-6cff7ac8f18f'
'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'
'TXXX:lastfmtags'                                   ['norwegian',
 'true norwegian black metal',
 'black metal',
 'norwegian black metal']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '4'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.59 dB'
'TXXX:replaygain_track_peak'                        '0.276727'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'a432e605-b368-4b31-9926-ceb6e29f6dc1')

========================== row from database ==========================
                                              'id'  1390784
                                            'path'  /data/Music/Bulk/00dwimp/00metal/Immortal - at the heart of winter/05 At The Heart Of Winter.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  480
                                           'genre'  eid-metal-black
                                        'filesize'  19226944
                                           'mtime'  1620301706
                                   'redo_metaread'  0
                                        'rest_str'   00dwimp 00metal at heart winter 05 The Of eid metal black
                                      'tag_artist'  Immortal
                                     'tag_release'  At the Heart of Winter
                                       'tag_title'  At the Heart of Winter
                                             'bpm'  146.0
                                    'search_title'  'at':1 'heart':3 'of':4 'the':2 'winter':5
                                   'search_artist'  'immortal':1
                                  'search_release'  'at':1 'heart':3 'of':4 'the':2 'winter':5
                                     'search_rest'  '00dwimp':1 '00metal':2 'at':3 'black':10 'eid':8 'heart':4 'metal':9 'of':7 'the':6 'winter':5
                                    'search_combo'  '00dwimp':12 '00metal':13 'at':1A,7C,14 'black':21 'eid':19 'heart':3A,9C,15 'immortal':6B 'metal':20 'of':4A,10C,18 'the':2A,8C,17 'winter':5A,11C,16
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  12B
                                           '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-3', 'q-syn-2', 'q-chart-3', 'q-other-4', 'Q-HAP-1', 'q-bass-3', 'q-grit-4']
                                      'lastfmtags'  ['norwegian', 'true norwegian black metal', 'black metal', 'norwegian black metal']
                                        'tag_date'  2006
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620301706.402565  (2021-05-06 13:48:26)
                             'size'  19226944