2017.3.3 (173.4301.25 ) Ultimate BROKE Database Integration
Answered
I just took the most current prod release of 2017.3.3, and Database Integration is now broken. The Database Tools and SQL plugin is now disabled and can't be re-enabled.
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What happens when I attempt to enable the plugin:

Reinstalled a fresh copy of the same release to a new location on disk. On starting from this location I was able to re-enable the plugin. Is the lesson here not to accept auto-updates? Nothing like this has happened to me before, and I've been using Intellij Idea for many years.
Did you install a patch update? Could you please report at https://youtrack.jetbrains.com/issues/IDEA with the idea.log and idea-updater log attached? See https://intellij-support.jetbrains.com/hc/articles/207241085.