You do not. You should not be looking at a Jira database, it's a complete mess as far as reporting and data relationships are, and it is the worst possible way to look at a Jira system.
As for write. No.
No. No. No.
You will probably get it wrong, and if you do, you will corrupt your system, possibly rendering it unusable, but even if you don't damage it too badly, you'll run into problems later, including never being able to upgrade.
And that's assuming you do the writes in the only safe way - Jira must be shut down when you write, and re-indexed immediately after restart (although you probably won't need to bother with that, as you'll almost certainly want to be restoring the database back to the backup you took before you made any change)
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