Better distribute db connection pool amongst workers

apps/api/src/database/db.ts

@@ -1,12 +1,13 @@
 import { CreateTableBuilder, Kysely, PostgresDialect, sql } from 'kysely';
 import { type DB } from "./out/db";
 import { Pool } from "pg";
-import { env } from '../util';
+import { env, WORKER_COUNT } from '../util';
 
 export const db = new Kysely<DB>({
     dialect: new PostgresDialect({
         pool: new Pool({
             connectionString: env.DATABASE_URL,
+            max: Math.max(1, Math.floor(+env.DATABASE_POOL_MAX / WORKER_COUNT))
         }),
     })
 });

apps/api/src/index.ts

@@ -1,11 +1,9 @@
 import cluster from 'node:cluster'
-import os from 'node:os'
-import { env, log } from "./util";
+import { log, WORKER_COUNT } from "./util";
 
 if (cluster.isPrimary) {
-    const n = Math.min(os.availableParallelism(), +env.MAX_WORKER_PROCESSES);
-    log.info(`Starting ${n} worker processes`)
-    for (let i = 0; i < n; i++)
+    log.info(`Starting ${WORKER_COUNT} worker processes`)
+    for (let i = 0; i < WORKER_COUNT; i++)
         cluster.fork()
 } else {
     await import('./server')

apps/api/src/util.ts

@@ -1,6 +1,7 @@
 import cluster from 'node:cluster';
 import { createHash } from 'node:crypto';
 import { pino } from 'pino';
+import os from 'node:os'
 
 export const log = pino({
     level: Bun.env.LOG_LEVEL ?? "info",
@@ -21,11 +22,13 @@ export const env = {
     AUTH_SECRET: requireEnv("AUTH_SECRET"),
     ADMIN_PASSWORD: requireEnv("ADMIN_PASSWORD"),
     DATABASE_URL: requireEnv("DATABASE_URL"),
-    MAX_WORKER_PROCESSES: requireEnv("MAX_WORKER_PROCESSES"),
+    DATABASE_POOL_MAX: requireEnv("DATABASE_POOL_MAX"),
+    MAX_WORKER_COUNT: requireEnv("MAX_WORKER_COUNT"),
     NODE_ENV: optionEnv("NODE_ENV", "development"),
     LOG_LEVEL: optionEnv("LOG_LEVEL", "info"),
 };
 
+export const WORKER_COUNT = Math.min(os.availableParallelism(), +env.MAX_WORKER_COUNT);
 export const DEFAULT_NAME = "Default";
 
 function requireEnv(key: string): string {