Module cost 

Per-model proxy savings accounting.

Headroom’s per-model cost breakdown was the one metric a tester found clearer than lean-ctx’s single flat number. This module buckets request-side savings by model and prices them with the shared ModelPricing table so /status can report estimated USD avoided per model.

Honesty contract: token counts here are request-side estimates (the bytes the proxy removed before forwarding). They deliberately do NOT try to model re-reads the agent may perform later, so figures are conservative and labelled estimated in the output.

Structs

ModelStat

One model’s aggregated, priced savings for the /status endpoint.

Functions

record

Records one request’s request-side savings against its model bucket.

snapshot

Returns per-model stats, priced and sorted by USD saved (descending).