docs: def connect(self, fn):
          """SQLite connect method initialize db"""
          self.conn = sqlite3.connect(fn)
          cur = self.get_cursor()
          cur.execute('PRAGMA page_size=4096')
          cur.execute('PRAGMA FOREIGN_KEYS=ON')
          cur.execute('PRAGMA cache_size=10000')
          cur.execute('PRAGMA journal_mode=MEMORY')