Unused VirtuosoAppender removed, the SQlAppender do not fetch based on stored logs count and try to save again in case of failure
Logs are flushed into database before end of the execution #879
Enable null values for DPU_KEY
Added method for list times of last execution of run-after pipelines
Run after require all the pipelines to be executed not only one #787
The logs and messages are flushed into database before execution ends #879