Four incremental upgrades to the AI program generator. No schema change, no /data migration.
1. History as context (the killer feature)
- lib/ai/historyContext.ts builds a 90-day per-exercise rollup:
frequency, recent weights, estimated 1RM (Epley), avg RPE,
days-since-last, plus a STAGNANT flag when the heaviest weight in
the new half doesn't beat the old half.
- Generate page surfaces an "Include my workout history as context"
checkbox (default on at >=10 logged workouts). When checked, the
~1-3 KB summary is appended to the system prompt so the model can
recommend things like "you've stalled bench at 245 — try paused reps."
- We deliberately don't ship raw set logs (privacy + token cost).
2. Test connection
- POST /api/ai/test sends a tiny "say hi in 3 words" prompt and
reports latency + first sample, or the error inline.
- "Test connection" button next to "Save AI config" in
Settings -> AI integration. Verifies provider/model/key/baseUrl
without going through full program generation.
3. Cost estimator
- lib/ai/pricing.ts ships a price table for major models
(Claude 3.5/3.7/4/4.5, GPT-4o/5/o1/o3/o4-mini, Gemini 1.5/2.0/2.5).
Ollama always returns 0; openai-compatible returns null.
- Generation history shows per-row cost + a 30-day rolling total
at the top of the page.
4. Streaming preview render
- lib/ai/lenientJson.ts: stack-aware partial-JSON parser that
auto-closes open strings/brackets/braces in reverse-of-opening
order, drops dangling key:value pairs and partial keywords.
Returns a best-effort snapshot of the program-so-far on each chunk.
- Generate UI now renders a live "Building program..." panel that
updates as weeks/days/exercises arrive instead of just showing
raw text and waiting for stream end.
Tests: 26 new (ai-historyContext.test.ts, ai-lenientJson.test.ts,
ai-pricing.test.ts). 161 total pass.
Keysat
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