Is it possible to adjust for how many days the logs should be stored in ignition .i would like to store it for 7 days r 10 days depending on my gateway.if it is possible how can it be done
You mean Audit Log? You may look for Retention and Pruning Enabled
https://www.docs.inductiveautomation.com/docs/8.1/platform/audit-log-and-profiles#database-audit-profile-properties-table