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ADR-0007: Ingestion Cutover Criteria (Rust/Go on Render)

  • Status: Proposed
  • Date: 2025-10-21

Context​

  • MVP can start with Next.js Route Handlers for small payloads; need triggers for cutover.

Decision​

  • Cut over to dedicated Rust/Go ingestion on Render when any:
    1. p95 ingest latency >500ms for payloads ≥10MB for 3 consecutive days, or
    2. sustained throughput ≥100k runs/hour, or
    3. persistent cold-start/CPU/mem SLO breaches for 24h.

Consequences​

  • Predictable migration point; preserves MVP velocity.

Alternatives considered​

  • Preemptive ingestion service (slower MVP).

Revisit criteria​

  • Observability signals show earlier pain; or Vercel limits change.

References​

  • PRD §4.2, §5.1; Architecture §8; Research §7.