[Bug]: Deleting an LlmProviderTemplate that an LlmProvider references succeeds, leaving the provider

Please select the area the issue is related to

Gateway

Please select the aspect the issue is related to

Aspect/API (API backends, definitions, contracts, interfaces, OpenAPI)

Description

DELETE /llm-provider-templates/{id} succeeds even when a deployed LlmProvider still references the template. The provider is left holding a reference and can no longer be updated or redeployed and any subsequent PUT fails with failed to retrieve template.

Steps to Reproduce

All requests against http://localhost:9090/api/management/v1, basic auth.

1. POST /llm-provider-templates - create a template named demo-ref-template.

2. POST /llm-providers - create a provider named demo-ref-provider referencing the above template

3. DELETE /llm-provider-templates/demo-ref-template

• Actual: 200 OK, "LLM provider template deleted successfully"

• Expected: 409 Conflict

4. GET /llm-provider-templates/demo-ref-template → 404, template is gone

5. GET /llm-providers/demo-ref-provider → 200, still present, still referencing the deleted template.

6. PUT /llm-providers/demo-ref-provider with an unchanged body → gives error as it references a template that doesn't exist

Severity Level of the Issue

Severity/Major (Important functionality is broken. Should be prioritized. Doesn't need immediate attention)

Environment Details (with versions)

No response