Deleting reports from cache

If previously generated reports are removed from the cache, then the data journal generation date will update at next generation, and the report info generation date will not. This is due to the fact that the generation date in the report info reflects the first generation time. The generation date in the root of the data journal reflects the generation date of the data journal. When reports are deleted from the cache, the generation date from the data journal root and the report info object will be out of sync. This is because the report info contains the first generation date, and the data journal contains the most recent generation date.