code: def _create(self, cache_file):
          
          conn = sqlite3.connect(cache_file)
          cur = conn.cursor()
          cur.execute("PRAGMA foreign_keys = ON")
          cur.execute('''
              CREATE TABLE jobs(
                  hash TEXT NOT NULL UNIQUE PRIMARY KEY, description TEXT NOT NULL,
                  last_run REAL, next_run REAL, last_run_result INTEGER)''')
  
          cur.execute('''
              CREATE TABLE history(
                  hash TEXT, description TEXT, time REAL, result INTEGER,
                  FOREIGN KEY(hash) REFERENCES jobs(hash))''')
  
          conn.commit()
          conn.close()
docs: Create the tables needed to store the information.