Headroom Daily: Cache Waste, Model Pins, and Settings Fixes
Merged changes stop proxy restarts from rewriting warm prompt caches and fix inflated savings math, while locking the default embedder to a pinned snapshot. The broader pattern is reliability over features: accounting, offline behavior, and small startup crashes.
Duration: PT2M5S
Episode overview
This episode is a short developer briefing from Headroom Daily.
It explains recent repository work in plain language.
- Show: Headroom Daily
- Published: 2026-10-21T22:00:35Z
- Audio duration: PT2M5S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, it's October 21st, 2026.
The lead story is cache cost. Restarts were quietly throwing away provider prompt caches, and the savings dashboard was making the problem look smaller than it was.
First, prefix stability. In PR 4299, one machine saw every graceful restart rewrite active sessions, about 4.6 million tokens of cache writes in a day, roughly a quarter of all writes. The fix is an opt-in state file that saves tracker state on shutdown and replays byte-identical prefixes on startup. In live…
Second, measurement. PR 4285 found inferred OpenAI cache writes counted twice as new input, so a true 50 percent savings rate read as 33 percent. PR 4286 fixes a companion blind spot: Codex closes the stream right after the terminal event, which the proxy logged as a 502 failure and threw away usage and cache credit…
Third, trust and limits. PR 4152 closes a supply-chain gap where the default relevance model floated on main instead of its pin and cached in the system temp directory. It now loads from the pinned snapshot in the standard shared cache. Existing installs download about 67 megabytes once, and air-gapped hosts must…
What's next: if you operate the proxy, plan that…
Nearby episodes from Headroom Daily
- Cache Isolation Fixes and Hosted YouTube Transcripts
- Scaling for Replicas and Fixing Silent Corruption
- Agent Reach 1.6 Locks Release as Headroom Fixes Cost Math
- Stateless Scaling and Cutting Compression Waste
- Silent Proxy Bypasses and Retrieval Window Fixes
- Stopping Cache Resets and Compression Mistakes
- Silent Data Errors and Stale Skill Docs Fixed
- WebSocket Hook Parity and Historical Research Fixes