======================== unified (from filesystem) ========================
                                         'bitrate'  '234.572'
                                        'duration'  '286'
                                          'artist'  'John Mayall'
                                     'text_people'  'Marshall Paul'
                                         'release'  'Looking Back'
                                           'title'  'So Many Roads'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-JZFKS-2', "
 "'Q-OLDST-2', 'q-syn-1', 'q-bass-4', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['blues rock', 'british', 'british blues', 'rock', 'blues', 'classic rock']"
                                     'discogstags'  "['rock', 'blues rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '135.7'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Looking Back'
'TBPM' (BPM (beats per minute))                     '135.7'
'TCOM' (Composer)                                   'Marshall Paul'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDOR' (Original release time)                      '1990'
'TDRC' (Recording time)                             '1990'
'TIT2' (Title/songname/content description)         'So Many Roads'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Peter Ward'
'TPE2' (Band/orchestra/accompaniment)               'John Mayall'
'TPUB' (Publisher)                                  'London'
'TRCK' (Track number/Position in set)               '4'
'TSSE' (Software/Hardware and settings used for encoding)  'Lavf56.40.101'
'TXXX:AverageLevel'                                 '2683'
'TXXX:DeviceConformanceTemplate'                    'L1'
'TXXX:IsVBR'                                        '0'
'TXXX:PeakValue'                                    '22305'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:WM/EncodingTime'                              '18446744071937686912'
'TXXX:WM/MediaPrimaryClassID'                       '{D1607DBC-E323-4BE2-86A1-48A42A28441E}'
'TXXX:WM/Provider'                                  'AMG'
'TXXX:WM/ProviderRating'                            '4'
'TXXX:WM/ProviderStyle'                             'Rock'
'TXXX:WM/UniqueFileIdentifier'                      'AMGa_id=R    12578;AMGp_id=P     4860;AMGt_id=T  2829086'
'TXXX:WM/Year'                                      '1969'
'TXXX:WMFSDKNeeded'                                 '0.0.0.0000'
'TXXX:WMFSDKVersion'                                '11.0.5721.5145'
'TXXX:discogstags'                                  ['rock', 'blues rock']
'TXXX:lastfmtags'                                   ['blues rock', 'british', 'british blues', 'rock', 'blues', 'classic rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.10 dB'
'TXXX:replaygain_track_peak'                        '0.578873'

========================== row from database ==========================
                                              'id'  1308793
                                            'path'  /data/Music/Bulk/00poprockelectronic/John Mayall/John Mayall & the Bluesbreakers/Looking Back/04 So Many Roads.wma.mp3
                                         'working'  None
                                         'bitrate'  234
                                    'duration_sec'  286
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  8417003
                                           'mtime'  1620540885
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic & the Bluesbreakers 04 Roads.wma prerock jb jazz unsorted
                                      'tag_artist'  John Mayall
                                     'tag_release'  Looking Back
                                       'tag_title'  So Many Roads
                                             'bpm'  135.7
                                    'search_title'  'many':2 'roads':3 'so':1
                                   'search_artist'  'john':1 'mayall':2
                                  'search_release'  'back':2 'looking':1
                                     'search_rest'  '00poprockelectronic':1 'bluesbreakers':3 'jazz':9 'jb':8 'prerock':7 'roads':4 'roadswma':6 'the':2 'unsorted':10 'wma':5
                                    'search_combo'  '00poprockelectronic':8 'back':7C 'bluesbreakers':10 'jazz':16 'jb':15 'john':4B 'looking':6C 'many':2A 'mayall':5B 'prerock':14 'roads':3A,11 'roadswma':13 'so':1A 'the':9 'unsorted':17 'wma':12
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  ['blues rock', 'british', 'british blues', 'rock', 'blues', 'classic rock']
                                        'tag_date'  1990
                                     'discogstags'  ['rock', 'blues rock']

============================== file details ==============================
                                           'mtime'  1620540884.9942238  (2021-05-09 08:14:44)
                             'size'  8417003