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@4k4 You're probably right, been reading in detail the relationship between key_value & key_value_expire and the rest of the db. I took a mysqldump of my dev DB and updated those two tables with values from the dev DB, cleared the cache and did a drush updb, problem has resolved itself, i did get a few notices, but it's better than how it was before.
@4k4 I tried but when i do i get the following error message which just confuses me even further as i can't see how it's even possible. Error name: "MINIMUM SCHEMA VERSION", error message: "Your system schema version is -1. Updating directly from a schema version prior to 8000 is not supported. You must upgrade your site to Drupal 8 first". Core is 8.5.4 and all modules are up to date with no errors/notices.
Well this could work, but it seems at overkill just to pass two strings. Essentially creating a CT and having to read/write from the db is a bit to much imho. But i do appreciate the answer.
