## Description
Adds pricing support for DeepSeek V4 models (`deepseek-v4-flash` and
`deepseek-v4-pro`) when routing Headroom through `--anthropic-api-url
https://api.deepseek.com/anthropic`. The vendored LiteLLM pricing
database predates DeepSeek V4, so cost estimation silently returned
`None` for these models.
## Type of Change
- [x] New feature (non-breaking change that adds functionality)
## Changes Made
- **`headroom/pricing/deepseek_prices.py`** — New pricing data module
with `ModelPricing` dataclass entries for both V4 models, following the
pattern of `anthropic_prices.py`
- **`headroom/pricing/__init__.py`** — Exports `DEEPSEEK_PRICES`,
`get_deepseek_registry()`, `DEEPSEEK_LAST_UPDATED`
- **`headroom/pricing/litellm_pricing.py`** — Runtime injection of
DeepSeek V4 pricing into `litellm.model_cost`, plus `deepseek-` prefix
added to `resolve_litellm_model()` provider prefix list
- **`headroom/providers/anthropic.py`** — DeepSeek fallback in
`_get_pricing()` when model starts with `deepseek-` and LiteLLM is
unavailable
- **`crates/headroom-proxy/data/model_prices_and_context_window.json`**
— Vendored JSON entries (bare + provider-prefixed) for Rust-side context
window lookups
- **`tests/test_providers/test_deepseek.py`** — 20 tests across 3 test
classes (pricing data, LiteLLM injection, Anthropic fallback)
- **`tests/test_pricing.py`** — Added DeepSeek export validation
alongside existing OpenAI/Anthropic assertions
## Testing
- [x] Unit tests pass (`pytest`)
- [ ] Linting passes (`ruff check .`)
- [ ] Type checking passes (`mypy headroom`)
- [x] New tests added for new functionality
- [ ] Manual testing performed
### Test Output
```
========================= 137 passed, 8 warnings in 8.47s =========================
```
## Real Behavior Proof
- Environment: Windows 10, Python 3.12, litellm 1.60+
- Exact command / steps: `python -c "from headroom.proxy.cost import
CostTracker; t = CostTracker();
print(t.estimate_cost('deepseek-v4-flash', input_tokens=1000000,
output_tokens=1000000))"`
- Observed result: `$0.4200` (0.14 input + 0.28 output per 1M tokens)
- Not tested: Live DeepSeek API routing via `--anthropic-api-url`
(requires API key and Docker deployment)
## Review Readiness
- [x] I have performed a self-review
- [x] This PR is ready for human review
## Checklist
- [x] My code follows the project's style guidelines
- [x] I have performed a self-review of my code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] I have updated the CHANGELOG.md if applicable
## Additional Notes
The 90% cache discount heuristic in `AnthropicProvider.estimate_cost()`
(line 680) is a pre-existing pattern. DeepSeek V4 has much deeper cache
discounts (98-99%), but the LiteLLM path currently falls through to the
manual fallback which uses correct cached prices. A future improvement
could prefer `cache_read_input_token_cost` from model info over the
hardcoded `* 0.1` heuristic.
---------
Co-authored-by: Claude <noreply@anthropic.com>
`.gitattributes` declares `*.py text eol=lf` and `*.sh text eol=lf`, but
74 files (73 .py, 1 .sh) are stored in the index with CRLF line endings,
violating that contract. Every macOS/Linux clone reports these files as
"modified" on fresh checkout because git's diff engine sees the stored
bytes don't match the attribute contract, even though the working tree
and index match byte-for-byte.
Running `git add --renormalize .` rewrites each affected blob so the
stored form matches the attribute declaration. No semantic changes —
every affected file's diff is "N insertions, N deletions" with inserts
and deletes being the same lines modulo line endings.
Follow-up commit adds `.git-blame-ignore-revs` so `git blame` / GitHub
blame skip this mechanical commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
