======================== unified (from filesystem) ========================
                                         'bitrate'  '217.242'
                                        'duration'  '254'
                                          'artist'  'Squirrel Nut Zippers'
                                     'text_people'  ''
                                         'release'  'Perennial Favorites'
                                           'title'  'Low Down Man'
                                           'quals'  ("['Q-HAP-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-2', 'Q-JZFKS-2', 'Q-UNU-1', "
 "'Q-OLDST-3', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['retro swing', 'alternative', 'jazz', 'retro', 'swing']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '12'
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-soft-swing'
                                             'bpm'  '111.2'
                                             'key'  '5B'
                                        'acoustid'  'b66cc710-cb5e-4afc-9b06-06e5899be511'
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Perennial Favorites'
'TBPM' (BPM (beats per minute))                     '111.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-soft-swing'
'TDOR' (Original release time)                      '1998'
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         'Low Down Man'
'TKEY' (Initial key)                                '5B'
'TLEN' (Length)                                     '254981'
'TMED' (Media type)                                 'Cassette'
'TPE1' (Lead performer(s)/Soloist(s))               'Squirrel Nut Zippers'
'TPE2' (Band/orchestra/accompaniment)               'Squirrel Nut Zippers'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Mammoth Records'
'TRCK' (Track number/Position in set)               '2/12'
'TSO2'                                              'Squirrel Nut Zippers'
'TSOP' (Performer sort order)                       'Squirrel Nut Zippers'
'TSRC' (ISRC (international standard recording code))  'US2199816902'
'TXXX:ASIN'                                         'B000009PNO'
'TXXX:Acoustid Id'                                  'b66cc710-cb5e-4afc-9b06-06e5899be511'
'TXXX:Artists'                                      'Squirrel Nut Zippers'
'TXXX:BARCODE'                                      '035498016943'
'TXXX:CATALOGNUMBER'                                '354 980169-4'
'TXXX:MusicBrainz Album Artist Id'                  '31810c40-932a-4f2d-8cfd-17849844e2a6'
'TXXX:MusicBrainz Album Id'                         'c09d1d39-520d-3b00-b548-46dae302412f'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        '31810c40-932a-4f2d-8cfd-17849844e2a6'
'TXXX:MusicBrainz Release Group Id'                 '9e24e2d0-6598-36e3-bc24-48fd7c4708d4'
'TXXX:MusicBrainz Release Track Id'                 '6c8ddc55-3609-3b99-9129-17225d5672fb'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['retro swing', 'alternative', 'jazz', 'retro', 'swing']
'TXXX:originalyear'                                 '1998'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.25 dB'
'TXXX:replaygain_track_peak'                        '0.435493'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'01f60043-2e95-47e5-8061-dd9890a17b4c')

========================== row from database ==========================
                                              'id'  1311337
                                            'path'  /data/Music/Bulk/00poprockelectronic/Squirrel Nut Zippers/Perennial Favorites/02 - low down man.mp3
                                         'working'  None
                                         'bitrate'  217
                                    'duration_sec'  254
                                           'genre'  prerock-jb-jazz-soft-swing
                                        'filesize'  7023055
                                           'mtime'  1620541113
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 02 low down man prerock jb jazz soft swing
                                      'tag_artist'  Squirrel Nut Zippers
                                     'tag_release'  Perennial Favorites
                                       'tag_title'  Low Down Man
                                             'bpm'  111.2
                                    'search_title'  'down':2 'low':1 'man':3
                                   'search_artist'  'nut':2 'squirrel':1 'zippers':3
                                  'search_release'  'favorites':2 'perennial':1
                                     'search_rest'  '00poprockelectronic':1 'down':3 'jazz':7 'jb':6 'low':2 'man':4 'prerock':5 'soft':8 'swing':9
                                    'search_combo'  '00poprockelectronic':9 'down':2A,11 'favorites':8C 'jazz':15 'jb':14 'low':1A,10 'man':3A,12 'nut':5B 'perennial':7C 'prerock':13 'soft':16 'squirrel':4B 'swing':17 'zippers':6B
                                    'tag_tracknum'  2
                                      'num_images'  1
                                             'key'  5B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['retro swing', 'alternative', 'jazz', 'retro', 'swing']
                                        'tag_date'  1998
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620541112.9852123  (2021-05-09 08:18:32)
                             'size'  7023055