======================== unified (from filesystem) ========================
                                         'bitrate'  '233.148'
                                        'duration'  '150'
                                          'artist'  'John Mayall & The Bluesbreakers'
                                     'text_people'  'James C. Bracken'
                                         'release'  'Blues Breakers With Eric Clapton'
                                           'title'  "Steppin' Out"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
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 "'q-chart-2', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['blues rock', 'blues', 'british blues', 'rock', 'classic rock']"
                                     'discogstags'  ("['rock', 'blues', 'blues rock', 'electric blues', 'chicago blues', "
 "'harmonica blues']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '23'
                                      'tracktotal'  '24'
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'rock-pop-early-blues'
                                             'bpm'  '91'
                                             'key'  '6A'
                                        'acoustid'  'a384a82a-7bb6-4153-922e-933ab26dda5e'
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Blues Breakers With Eric Clapton'
'TBPM' (BPM (beats per minute))                     '91'
'TCOM' (Composer)                                   'James C. Bracken'
'TCON' (Content type, a.k.a. Genre)                 'rock-pop-early-blues'
'TDOR' (Original release time)                      '1966'
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         "Steppin' Out"
'TKEY' (Initial key)                                '6A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'John Mayall & The Bluesbreakers'
'TPE2' (Band/orchestra/accompaniment)               'John Mayall & The Bluesbreakers'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Deram'
'TRCK' (Track number/Position in set)               '23/24'
'TSO2'                                              'Mayall, John & The Bluesbreakers'
'TSOP' (Performer sort order)                       'Mayall, John & The Bluesbreakers'
'TSRC' (ISRC (international standard recording code))  'GBF076822670'
'TSSE' (Software/Hardware and settings used for encoding)  'Lavf56.40.101'
'TXXX:ASIN'                                         'B0000249ZZ'
'TXXX:Acoustid Id'                                  'a384a82a-7bb6-4153-922e-933ab26dda5e'
'TXXX:Artists'                                      'John Mayall & The Bluesbreakers'
'TXXX:AverageLevel'                                 '7035'
'TXXX:BARCODE'                                      '042284482721'
'TXXX:CATALOGNUMBER'                                '844 827-2'
'TXXX:DeviceConformanceTemplate'                    'L1'
'TXXX:IsVBR'                                        '0'
'TXXX:MediaFoundationVersion'                       '2.112'
'TXXX:MusicBrainz Album Artist Id'                  '4756395c-57ed-4a63-afb2-01117f14dff6'
'TXXX:MusicBrainz Album Id'                         '310d86b6-2e4c-3fed-9705-b2f5b0d98e87'
'TXXX:MusicBrainz Album Release Country'            'GB'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        '4756395c-57ed-4a63-afb2-01117f14dff6'
'TXXX:MusicBrainz Release Group Id'                 '2b031a2e-9d80-3240-b065-9445fb37f00b'
'TXXX:MusicBrainz Release Track Id'                 '91a53d57-86cd-3d0d-8e72-6f41a4f86d40'
'TXXX:PeakValue'                                    '31905'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:WM/EncodingTime'                              '18446744071902356096'
'TXXX:WM/MediaPrimaryClassID'                       '{D1607DBC-E323-4BE2-86A1-48A42A28441E}'
'TXXX:WM/Provider'                                  'AMG'
'TXXX:WM/ProviderRating'                            '8'
'TXXX:WM/ProviderStyle'                             'Country'
'TXXX:WM/UniqueFileIdentifier'                      'AMGa_id=R   567348;AMGp_id=P     4860;AMGt_id=T  5431151'
'TXXX:WM/Year'                                      '1966'
'TXXX:WMFSDKNeeded'                                 '0.0.0.0000'
'TXXX:WMFSDKVersion'                                '12.0.7600.16385'
'TXXX:discogstags'                                  ['rock',
 'blues',
 'blues rock',
 'electric blues',
 'chicago blues',
 'harmonica blues']
'TXXX:lastfmtags'                                   ['blues rock', 'blues', 'british blues', 'rock', 'classic rock']
'TXXX:originalyear'                                 '1966'
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-1.78 dB'
'TXXX:replaygain_track_peak'                        '0.406816'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'201d516b-9ff3-4e3a-bff4-cf7056f31cf0')

========================== row from database ==========================
                                              'id'  1516955
                                            'path'  /data/Music/Bulk/00poprockelectronic/John Mayall/John Mayall-Eric Clapton/Bluesbreakers with Eric Clapton [Universal Japan]/23 Steppin_ Out [Stereo Version].wma.mp3
                                         'working'  None
                                         'bitrate'  233
                                    'duration_sec'  150
                                           'genre'  rock-pop-early-blues
                                        'filesize'  4468428
                                           'mtime'  1620736747
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic with [Universal Japan] 23 Steppin_ [Stereo Version].wma rock pop early blues
                                      'tag_artist'  John Mayall & The Bluesbreakers
                                     'tag_release'  Blues Breakers With Eric Clapton
                                       'tag_title'  Steppin' Out
                                             'bpm'  91.0
                                    'search_title'  'out':3 'steppin':1,2
                                   'search_artist'  'bluesbreakers':4 'john':1 'mayall':2 'the':3
                                  'search_release'  'blues':1 'breakers':2 'clapton':5 'eric':4 'with':3
                                     'search_rest'  '00poprockelectronic':1 '23':7 'blues':17 'early':16 'japan':5,6 'pop':15 'rock':14 'steppin':8 'stereo':9,10 'universal':3,4 'version':11 'versionwma':13 'with':2 'wma':12
                                    'search_combo'  '00poprockelectronic':13 '23':19 'blues':8C,29 'bluesbreakers':7B 'breakers':9C 'clapton':12C 'early':28 'eric':11C 'japan':17,18 'john':4B 'mayall':5B 'out':3A 'pop':27 'rock':26 'steppin':1A,2A,20 'stereo':21,22 'the':6B 'universal':15,16 'version':23 'versionwma':25 'with':10C,14 'wma':24
                                    'tag_tracknum'  23
                                      'num_images'  1
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['blues rock', 'blues', 'british blues', 'rock', 'classic rock']
                                        'tag_date'  1998
                                     'discogstags'  ['rock', 'blues', 'blues rock', 'electric blues', 'chicago blues', 'harmonica blues']

============================== file details ==============================
                                           'mtime'  1620736747.0472565  (2021-05-11 14:39:07)
                             'size'  4468428