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perf(api): slow pg-boss polling to cut Vercel Fluid CPU use #62

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Merged
CodeWithEugene merged 1 commit into from
Nov 3, 2026
Merged

perf(api): slow pg-boss polling to cut Vercel Fluid CPU use #62

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21 changes: 15 additions & 6 deletions lib/jobs/handlers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,15 @@ import { getQueue } from "@/lib/queue";
* stay idempotent (pg-boss delivers at-least-once, work() receives batches).
*/

/**
* pg-boss polls Postgres once per interval per worker (default 2s). On
* Vercel's Fluid compute every warm instance pays CPU for that, so the
* intervals are kept long: job families are not latency-critical (payout KPI
* is one hour), and cron jobs fire at most every ten minutes.
*/
const JOB_POLLING = { pollingIntervalSeconds: 30 };
const CRON_POLLING = { pollingIntervalSeconds: 60 };

const g = globalThis as unknown as { __hv_jobs_registered?: boolean };

async function registerJob(
Expand All @@ -20,7 +29,7 @@ async function registerJob(
await boss.createQueue(name).catch((error: { code?: string }) => {
if (error?.code !== "B03") throw error;
});
await boss.work(name, async (jobs: Job<Record<string, unknown>>[]) => {
await boss.work(name, JOB_POLLING, async (jobs: Job<Record<string, unknown>>[]) => {
for (const job of jobs) {
try {
await handler(job.data ?? {});
Expand Down Expand Up @@ -84,7 +93,7 @@ export async function registerJobs(): Promise<void> {
await boss
.schedule("escrow.cron", "0 * * * *", { kind: "expire-deposits" })
.catch(() => undefined); // schedule already exists — idempotent registration
await boss.work("escrow.cron", async (jobs: Job<{ kind?: string }>[]) => {
await boss.work("escrow.cron", CRON_POLLING, async (jobs: Job<{ kind?: string }>[]) => {
for (const job of jobs) {
if (job.data?.kind !== "expire-deposits") continue;
const expired = await deposits.expireStaleDeposits();
Expand Down Expand Up @@ -113,7 +122,7 @@ export async function registerJobs(): Promise<void> {
await boss
.schedule("payout.cron", "*/10 * * * *", { kind: "sweep-payouts" })
.catch(() => undefined);
await boss.work("payout.cron", async (jobs: Job<{ kind?: string }>[]) => {
await boss.work("payout.cron", CRON_POLLING, async (jobs: Job<{ kind?: string }>[]) => {
for (const job of jobs) {
if (job.data?.kind !== "sweep-payouts") continue;
const driven = await payouts.sweepStuckPayouts();
Expand All @@ -132,7 +141,7 @@ export async function registerJobs(): Promise<void> {
await boss
.schedule("media.cron", "*/15 * * * *", { kind: "enforce-media-deadlines" })
.catch(() => undefined);
await boss.work("media.cron", async (jobs: Job<{ kind?: string }>[]) => {
await boss.work("media.cron", CRON_POLLING, async (jobs: Job<{ kind?: string }>[]) => {
for (const job of jobs) {
if (job.data?.kind !== "enforce-media-deadlines") continue;
const result = await media.enforceMediaDeadlines();
Expand All @@ -150,7 +159,7 @@ export async function registerJobs(): Promise<void> {
await boss
.schedule("legacy.cron", "0 9 * * *", { kind: "legacy-sweep" })
.catch(() => undefined);
await boss.work("legacy.cron", async (jobs: Job<{ kind?: string }>[]) => {
await boss.work("legacy.cron", CRON_POLLING, async (jobs: Job<{ kind?: string }>[]) => {
for (const job of jobs) {
if (job.data?.kind !== "legacy-sweep") continue;
const legacyResult = await legacy.runLegacySweep();
Expand All @@ -171,7 +180,7 @@ export async function registerJobs(): Promise<void> {
await boss
.schedule("ledger.cron", "0 3 * * *", { kind: "reconcile-ledger" })
.catch(() => undefined);
await boss.work("ledger.cron", async (jobs: Job<{ kind?: string }>[]) => {
await boss.work("ledger.cron", CRON_POLLING, async (jobs: Job<{ kind?: string }>[]) => {
for (const job of jobs) {
if (job.data?.kind !== "reconcile-ledger") continue;
const result = await reconcileLedger();
Expand Down
9 changes: 8 additions & 1 deletion lib/queue.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,14 @@ export async function getQueue(): Promise<PgBoss> {
if (starting) return starting;

starting = (async () => {
const instance = new PgBoss({ connectionString: getEnv().DATABASE_URL });
const instance = new PgBoss({
connectionString: getEnv().DATABASE_URL,
// Keep background loops slow: on Vercel every warm instance is billed
// CPU for them (cron schedules fire at most every ten minutes).
cronMonitorIntervalSeconds: 45,
cronWorkerIntervalSeconds: 45,
maintenanceIntervalSeconds: 600,
});
instance.on("error", (error) => {
// Queue errors must be visible but never crash the request path.
console.error("[pg-boss]", error);
Expand Down
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