Sry, I was completely stumped. Now I got it. You migrated from old MYSQL persistence bundle to JDBC/MariaDB persistence addon. Is that correct? And I have to admit that I have no clue how that is working except from what I can see from the config file.
One thing I notices is that your table is called “Items” (notice the capital “I” at the beginning) where as the JDBC binding tries to read the item table matching from “items” (notice the lower “i” at the beginning). This value/name is hard-coded and cannot be changed like prefix for the table name for the items themselves. Can you try to rename your table?