-- Record real provider-reported run cost for /cost reporting.
-- No backfill: pre-existing test runs remain cost-unrecorded by design.
ALTER TABLE "AgentRun" ADD COLUMN "costUsd" DECIMAL(18, 8);
ALTER TABLE "AgentRun" ADD COLUMN "costSource" TEXT;

CREATE INDEX "AgentRun_projectId_finishedAt_idx" ON "AgentRun"("projectId", "finishedAt");