Splunk DB Connect App and Splunk TA Oracle: Updating the checkpoint value for all inputs through conf file

I have tried using tail_rising_column_checkpoint_value in db_input.conf file but doesn't work. Also, is there a way to avoid this in the future? Checkpoint Value for Rising Column of END_TIME has set to default value of 1/1/1970 after Heavy Forwarder was restarted.