======================== unified (from filesystem) ========================
                                         'bitrate'  '108.299'
                                        'duration'  '178'
                                          'artist'  'Jimmie Rogers'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Train Whistle Blues'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'folk', 'blues', 'bluegrass', 'classic country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1945'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '110.967'
                                             'key'  '1B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '110.967'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1945'
'TIT2' (Title/songname/content description)         'Train Whistle Blues'
'TKEY' (Initial key)                                '1B'
'TPE1' (Lead performer(s)/Soloist(s))               'Jimmie Rogers'
'TSSE' (Software/Hardware and settings used for encoding)  'Lavf56.40.101'
'TXXX:DeviceConformanceTemplate'                    'L1'
'TXXX:IsVBR'                                        '1'
'TXXX:Length'                                       '177959'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['country', 'folk', 'blues', 'bluegrass', 'classic country']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.05 dB'
'TXXX:replaygain_track_peak'                        '0.568643'

========================== row from database ==========================
                                              'id'  968173
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Old Country Music/Jimmy Rodgers - Train Whistle Blues 1930.wma.mp3
                                         'working'  None
                                         'bitrate'  108
                                    'duration_sec'  178
                                           'genre'  loc-namerica-country
                                        'filesize'  2412544
                                           'mtime'  1621628196
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Old Country Music Jimmy Rodgers 1930.wma loc namerica country
                                      'tag_artist'  Jimmie Rogers
                                     'tag_release'  None
                                       'tag_title'  Train Whistle Blues
                                             'bpm'  110.967
                                    'search_title'  'blues':3 'train':1 'whistle':2
                                   'search_artist'  'jimmie':1 'rogers':2
                                  'search_release'  
                                     'search_rest'  '1930':9 '1930wma':11 'country':4 'exotica':2 'jazz':1 'jimmy':7 'loc':12 'music':6 'namerica':13 'old':5 'oldies':3 'rodgers':8 'wma':10
                                    'search_combo'  '1930':14 '1930wma':16 'blues':3A 'country':9 'exotica':7 'jazz':6 'jimmie':4B 'jimmy':12 'loc':17 'music':11 'namerica':18 'old':10 'oldies':8 'rodgers':13 'rogers':5B 'train':1A 'whistle':2A 'wma':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['country', 'folk', 'blues', 'bluegrass', 'classic country']
                                        'tag_date'  1945
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628196.2591102  (2021-05-21 22:16:36)
                             'size'  2412544