Two production-grade hardening additions and one cost optimisation.
FLUXAI AUTONOMY RESTORED (api/chat)
- Brings back the multi-step agentic flow that the system prompt was
always designed for. The "temporarily removed maxSteps" comment is
gone — replaced with the AI SDK 6 equivalent stopWhen: stepCountIs(5).
- Cap at 5 chained tool calls per turn bounds latency + LLM cost.
- maxDuration raised 30s → 60s to absorb tool-chain runs.
- Result: one user prompt now triggers, e.g. search_installations →
energy_savings_calculator → show_case_study → schedule_consultation
in a single turn — exactly the SPIN methodology in the prompt.
RATE LIMITING (src/lib/rateLimit.ts + api/chat)
- Token-bucket per IP: 30 messages burst, sustained 30/minute. Trips
to 429 with Retry-After + X-RateLimit-Remaining headers when abused.
- IP extracted from x-forwarded-for (Nginx already passes this).
- In-memory Map with 10-min GC of stale buckets — no Redis dep.
If we scale to multiple replicas later, swap the Map for Upstash.
- Protects the OpenAI quota from someone hammering the chat endpoint.
IMAGE PIPELINE (src/lib/imageOptimizer.ts)
- sharp-based optimizer: auto-orient (EXIF), cap at 2560px long side,
re-encode WebP@85, content-hash filename. Re-uploads with same
content reuse the same hash; new content gets a new URL — perfect
cache invalidation without header tricks.
- Opt-in via optimize=1 form/query param on /api/assets POST.
- Hero CMS and Site Settings uploads turn it on automatically (those
are user-facing brand assets where compression matters most).
- App/news/parts uploads remain untouched (editors may be uploading
CAD drawings, datasheets, etc. that shouldn't be transcoded).
- Falls back gracefully to a no-op for unsupported formats (SVG, GIF,
videos, anything sharp can't decode) so it never breaks an upload.
DOCKERFILE
- Adds vips/vips-dev for sharp on Alpine + --include=optional so the
@img/sharp-linuxmusl-x64 prebuilt is downloaded
- Explicitly copies node_modules/sharp + node_modules/@img to the
runner stage (Next.js trace can miss conditional deps).
NO DB SCHEMA CHANGES.
davidherran