======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '120'
                                          'artist'  'ASC'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Confined Spaces'
                                           'quals'  ("['Q-MIXBEAT-3', 'Q-HAP-2', 'Q-UNU-1', 'q-syn-4', 'q-bass-4', 'q-busy-3', "
 "'q-grit-2', 'q-play-3', 'Q-JZFKS-1', 'Q-OLDST-3', 'q-chart-1', 'q-drums-4', "
 "'q-other-3', 'q-piano-1', 'q-vocals-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  ("['drum and bass', 'atmospheric', 'atmospheric drum and bass', 'drumfunk', "
 "'ambient']")
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '2010'
                                        'comments'  ''
                                           'genre'  'electronic-th-techno-minimal or deephouse'
                                             'bpm'  '126.2'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '126.2'
'TCON' (Content type, a.k.a. Genre)                 'electronic-th-techno-minimal or deephouse'
'TDRC' (Recording time)                             '2010'
'TIT2' (Title/songname/content description)         'Confined Spaces'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'ASC'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-MIXBEAT'                                    '3'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['drum and bass',
 'atmospheric',
 'atmospheric drum and bass',
 'drumfunk',
 'ambient']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '4'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-3.70 dB'
'TXXX:replaygain_track_peak'                        '0.623212'

========================== row from database ==========================
                                              'id'  856892
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/soundcloud/nplusplus-coll/Confined Spaces-116633064.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  120
                                           'genre'  electronic-th-techno-minimal or deephouse
                                        'filesize'  1936855
                                           'mtime'  1621084989
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm soundcloud nplusplus coll 116633064 electronic th techno minimal or deephouse
                                      'tag_artist'  ASC
                                     'tag_release'  None
                                       'tag_title'  Confined Spaces
                                             'bpm'  126.2
                                    'search_title'  'confined':1 'spaces':2
                                   'search_artist'  'asc':1
                                  'search_release'  
                                     'search_rest'  '116633064':4 'coll':3 'deephouse':10 'electronic':5 'minimal':8 'nplusplus':2 'or':9 'soundcloud':1 'techno':7 'th':6
                                    'search_combo'  '116633064':7 'asc':3B 'coll':6 'confined':1A 'deephouse':13 'electronic':8 'minimal':11 'nplusplus':5 'or':12 'soundcloud':4 'spaces':2A 'techno':10 'th':9
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'Q-MIXBEAT-3', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-4', 'q-chart-1', 'q-other-3', 'Q-HAP-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['drum and bass', 'atmospheric', 'atmospheric drum and bass', 'drumfunk', 'ambient']
                                        'tag_date'  2010
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1621084988.766502  (2021-05-15 15:23:08)
                             'size'  1936855