Documents the exact Prisma query per dashboard figure, the one new
durable table this feature needs (ErrorCodeLookup — 014's own equivalent
metric is process-lifetime, unusable for a historical report), the
"no data -> null, never NaN" convention, and why the AI dashboard's
confidence distribution deliberately uses the system-default threshold
rather than resolving a per-diagnosis policy (AIDiagnosis has no
reliable FK back to which policy applied).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
