This question has been answered by multiple community members. See the first response.
Trying to merge environments is tricky, but if you've kept to the rule of new content on the production site and new elements/assets on staging, then you might be able of grabbing just the content (site_content and site_tmplvar_contentvalues for TV values) from the production DB, inserting that into the staging DB, making sure it all works, and then pushing everything up to production.
Most importantly though: immediately update both environments to 2.6.5 as sites are actively being hacked. https://modx.today/posts/2018/07/modx-2.6.5-critical-security
After inserting the site_content and site_tmplvar_contentvalues values into the staging DB, do I need to clear the cache, and/or refresh URIs?
Quote from: scottmallinson at Jul 24, 2018, 08:31 AMAfter inserting the site_content and site_tmplvar_contentvalues values into the staging DB, do I need to clear the cache, and/or refresh URIs?
Yeah, I'd do both, just in case.
Oh, and of course take a backup of both environments before doing this