======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '161'
                                          'artist'  'Johnny Cash'
                                     'text_people'  ''
                                         'release'  'At Folsom Prison'
                                           'title'  'Folsom Prison Blues'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-2', "
 "'Q-HHRNBTT-1', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'singer songwritergdchill', 'cover', 'singer songwriter']"
                                     'discogstags'  "['folk, world, & country', 'country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '1962'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter'
                                             'bpm'  '111.455'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'At Folsom Prison'
'TBPM' (BPM (beats per minute))                     '111.455'
'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter'
'TDRC' (Recording time)                             '1962'
'TIT2' (Title/songname/content description)         'Folsom Prison Blues'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Johnny Cash'
'TRCK' (Track number/Position in set)               '1'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['folk, world, & country', 'country']
'TXXX:lastfmtags'                                   ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.69 dB'
'TXXX:replaygain_track_peak'                        '0.683527'

========================== row from database ==========================
                                              'id'  244033
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Johnny Cash/At Folsom Prison__MBZ;#Johnny Cash;#At Folsom Prison;#01;#Folsom Prison Blues.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  161
                                           'genre'  ifs-songwriter
                                        'filesize'  6480670
                                           'mtime'  1636400314
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos Prison__MBZ;#Johnny Cash;#At Prison;#01;#Folsom ifs songwriter
                                      'tag_artist'  Johnny Cash
                                     'tag_release'  At Folsom Prison
                                       'tag_title'  Folsom Prison Blues
                                             'bpm'  111.455
                                    'search_title'  'blues':3 'folsom':1 'prison':2
                                   'search_artist'  'cash':2 'johnny':1
                                  'search_release'  'at':1 'folsom':2 'prison':3
                                     'search_rest'  '00singer':1 '01':15,18 'at':11,13 'cash':10,12 'eos':3 'folsom':16,19 'ifs':20 'johnny':6,9 'mbz':5,8 'prison':4,7,14,17 'songwriter':2
                                    'search_combo'  '00singer':9 '01':23,26 'at':6C,19,21 'blues':3A 'cash':5B,18,20 'eos':11 'folsom':1A,7C,24,27 'ifs':28 'johnny':4B,14,17 'mbz':13,16 'prison':2A,8C,12,15,22,25 'songwriter':10
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-2', 'Q-HAP-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
                                        'tag_date'  1962
                                     'discogstags'  ['folk, world, & country', 'country']

============================== file details ==============================
                                           'mtime'  1636400314.2768233  (2021-11-08 20:38:34)
                             'size'  6480670