Generally, none - don't mess with the database behind Atlassian applications.
However, if you insist, then you'll need to be a bit more clear on what you mean by "content notifications". The record of what Confluence thinks it has sent? The config that tells it who to notify? etc?
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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