======================== unified (from filesystem) ========================
                                         'bitrate'  '191.147'
                                        'duration'  '168'
                                          'artist'  'Ella Fitzgerald'
                                     'text_people'  ''
                                         'release'  'Best of Ella Fitzgerald: First Lady of Song'
                                           'title'  "You're an Old Smoothie"
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                                      'lastfmtags'  "['blues', 'jazz', 'female vocalists', 'jazz vocal', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '12'
                                      'tracktotal'  '16'
                                            'date'  '1994'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '129.398'
                                             'key'  '7A'
                                        'acoustid'  '3b88208d-bcff-48ba-9e1e-ce398d2e6822'
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
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'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TDOR' (Original release time)                      '1994'
'TDRC' (Recording time)                             '1994'
'TIT2' (Title/songname/content description)         "You're an Old Smoothie"
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ella Fitzgerald'
'TPE2' (Band/orchestra/accompaniment)               'Ella Fitzgerald'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'PolyGram Records, Inc.'
'TRCK' (Track number/Position in set)               '12/16'
'TSO2'                                              'Fitzgerald, Ella'
'TSOP' (Performer sort order)                       'Fitzgerald, Ella'
'TXXX:ASIN'                                         'B00PUTHHDY'
'TXXX:Acoustid Id'                                  '3b88208d-bcff-48ba-9e1e-ce398d2e6822'
'TXXX:Artists'                                      'Ella Fitzgerald'
'TXXX:BARCODE'                                      '731452338228'
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'TXXX:MusicBrainz Album Id'                         '7b97bdd2-8733-4dc9-a663-e82367395693'
'TXXX:MusicBrainz Album Release Country'            'DE'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
'TXXX:MusicBrainz Artist Id'                        '54799c0e-eb45-4eea-996d-c4d71a63c499'
'TXXX:MusicBrainz Release Group Id'                 '7bf453ad-be2c-4af2-bf11-fe46ab62d225'
'TXXX:MusicBrainz Release Track Id'                 '2c6dce7e-ac01-4339-9473-d4f96dbac262'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['blues', 'jazz', 'female vocalists', 'jazz vocal', 'swing']
'TXXX:originalyear'                                 '1994'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.54 dB'
'TXXX:replaygain_track_peak'                        '0.554628'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'b070f8aa-53f4-4817-a886-39f44e40185e')

========================== row from database ==========================
                                              'id'  1504574
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Fitzgerald, Ella/First Lady of Song/Ella Fitzgerald - You_re an Old Smoothie.mp3
                                         'working'  None
                                         'bitrate'  191
                                    'duration_sec'  168
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  4057117
                                           'mtime'  1620528939
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Fitzgerald, You_re prerock jb jazz vocal
                                      'tag_artist'  Ella Fitzgerald
                                     'tag_release'  Best of Ella Fitzgerald: First Lady of Song
                                       'tag_title'  You're an Old Smoothie
                                             'bpm'  129.398
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                                   'search_artist'  'ella':1 'fitzgerald':2
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                                     'search_rest'  'country':4 'exotica':2 'fitzgerald':5,6 'jazz':1 'jb':10 'oldies':3 'prerock':9 're':8 'vocal':11 'you':7
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                                    'tag_tracknum'  12
                                      'num_images'  1
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['blues', 'jazz', 'female vocalists', 'jazz vocal', 'swing']
                                        'tag_date'  1994
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620528939.082286  (2021-05-09 04:55:39)
                             'size'  4057117