Traceback (most recent call last):
  File "backtester_core_speed3_veto_universe.py", line 390, in <module>
    main()
  File "backtester_core_speed3_veto_universe.py", line 57, in main
    con = connect_db(cfg["cache_db"])
  File "backtester_core_speed3_veto_universe.py", line 18, in connect_db
    con = sqlite3.connect(path)
sqlite3.OperationalError: unable to open database file