here is the part of my config file:

[models.deepseek_r1_free]
routing = ["openrouter_primary"]

[models.deepseek_r1_free.providers.openrouter_primary]
type = "openrouter"
model_name = "deepseek/deepseek-r1-0528:free"

2025-05-29T20:02:01.029694Z INFO gateway: Starting TensorZero Gateway 2025.5.7 (commit: f6ff580)

2025-05-29T20:02:01.032184Z ERROR tensorzero_internal::error: models.deepseek_r1_free.providers.openrouter_primary: unknown variant openrouter, expected one of anthropic, aws_sagemaker, azure, gcp_vertex_anthropic, gcp_vertex_gemini, google_ai_studio_gemini, github_copilot, hyperbolic, fireworks, mistral, openai, together, vllm, xai, tgi, sglang, deepseek

I couldn't find where the enum for providers.