OK

Bad Request. Each cause returns its own message. A malformed path ruleId and the groupId causes below all land here. Membership is validated before anything is written, so a 400 means the rule was not modified at all.

Not Found. ruleId is a well-formed UUID but no rule in this organization has it. One wording on every verb -- GET, PUT and DELETE all return this message.

Conflict. The request is well-formed, but another rule in this organization already occupies the same uniqueness slot for this action. The slot differs per action -- target template for generatePdf, target plus query hash for addRelation and changeProductStatus, target attribute plus context for editValue, template plus runtime for aiEnrich and aiLinguist. Every duplicate-rule message uses this status; it was 400 before this release.