Jira Cloud and Confluence use a DB per user architecture at reasonable, but not outrageous, scale. I can't share numbers because I am an ex-employee, but their

Jira Cloud and Confluence use a DB per user architecture at reasonable, but not outrageous, scale. I can't share numbers because I am an ex-employee, but their cloud figures are high enough. This architecture requires significant tooling an I don't recommend it. It will cause you all kinds of headaches with regards to reporting and aggregating data. You will spend a small fortune on vendor tools to solve these problems. And worst of all despite your best efforts you WILL end up with "snowflake" tenants whose schemas have drifted just enough to cause you MAJOR headaches.