Question
Is it mainly using data already stored in the database, or is it creating many tables on its own to store this data?
Does the functionality differ for issues created before/after the plugin is installed?
Answer
It’s NOT intrusive at all.
It mainly reads Time Tracking and Issue data from the Jira database. In DC, it creates an additional table to store scheduled job configurations only.
No functionality differs between issues created before/after the plugin is installed; i.e., no Jira functionality is modified or substituted.