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homelab-frontend/tasks/2.1-model-registry.md
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chore: initial commit of Go API gateway
Baseline for the Kong replacement on api.riotpiao.com. Brings the working
tree under version control for the first time: gateway source, the task
board that drives the agent runs, test fixtures, and K8s manifests.

Anchor the gateway ignore rule to the repo root. Unanchored, "gateway"
also matched the cmd/gateway/ source directory, so the program entrypoint
was excluded from every commit.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
2026-08-19 20:54:34 -07:00

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# 2.1 — Model registry (GREEN)
Phase: 2 — LLM surface
Stage: GREEN
Depends on: [0.2](0.2-route-configuration.md), [1.1](1.1-reverse-proxy.md)
- [ ] A model name -> upstream map is loaded from configuration at startup, never compiled in
- [ ] Each entry carries at minimum the model name clients send, the upstream address, and the upstream path to use
- [ ] Two model names may point at the same upstream address, and both resolve independently
- [ ] A duplicate model name, an empty model name, or an entry with no upstream address fails startup loudly with the offending entry named
- [ ] The registry is queryable by exact model name; lookup is case-sensitive and does no fuzzy matching or defaulting
- [ ] The set of known model names is enumerable, because `/v1/models` and unknown-model errors are both derived from it
The five entries verified live on 2026-08-19. Ports are 80, not 8080.
| model name clients send | upstream Service | engine |
|---|---|---|
| `reasoning` | `reasoning-predictor.llm-serving:80` | vLLM, DeepSeek-R1-Distill-Qwen-32B |
| `ornith:35b` | `ornith-predictor.llm-serving:80` | Ollama |
| `qwen2.5:3b-instruct` | `ornith-predictor.llm-serving:80` | Ollama, same pods |
| `nomic-ai/nomic-embed-text-v2-moe` | `embeddings-predictor.llm-serving:80` | TEI |
| `BAAI/bge-reranker-base` | `reranker-predictor.llm-serving:80` | TEI |
`ornith:35b` and `qwen2.5:3b-instruct` share pods and both stay resident, so a
registry that maps them to one address is correct, not a shortcut.
## Verify
```bash
# with the five entries configured against local stubs
curl -s -o /dev/null -w '%{http_code}\n' localhost:8080/readyz # expected: 200
# duplicate model name in config must refuse to start
./gateway --config testdata/duplicate-model.yaml; echo "exit=$?" # expected: non-zero exit, stderr names the duplicated model
```