OptionalModelThe MJ: AI Model Vendors row ids to try, in order (the ModelVendor binding tier).
OptionalPromptThe MJ: AI Prompt Models row id (the PromptModel binding tier).
OptionalVendorThe MJ: AI Vendors row id (the Vendor binding tier and the type-based default).
The metadata rows a platform credential can be bound to. Each is optional; absent tiers are skipped.