fix(deploy): migrate after stop and shrink DB pool

Stage migrate hit ER_CON_COUNT_ERROR while live still held the pool. Build in stage with DATABASE_POOL_SIZE=5, run db:migrate only after stopping the service (with retries), and lower the default pool from 40 to 10.

Co-authored-by: Cursor <[email protected]>

src/env.ts

@@ -8,7 +8,7 @@ const schema = z.object({
 		.enum(["development", "test", "production"])
 		.default("development"),
 	DATABASE_URL: z.string().url(),
-	DATABASE_POOL_SIZE: z.coerce.number().int().positive().default(40),
+	DATABASE_POOL_SIZE: z.coerce.number().int().positive().default(10),
 	DATABASE_IDLE_TIMEOUT_MS: z.coerce.number().int().positive().default(300_000),
 	DATABASE_CONNECT_TIMEOUT_MS: z.coerce
 		.number()

src/lib/deploy-workflow-contract.test.ts

@@ -14,6 +14,7 @@ describe("production deploy workflow", () => {
 		expect(deployJob).toContain("/var/tmp/atom-nexst-stage-");
 		expect(deployJob).toContain('ln -sfn "${LIVE}/.env"');
 		expect(deployJob).toContain("-e storage");
+		expect(deployJob).toContain("DATABASE_POOL_SIZE=");
 		expect(deployJob).not.toContain("SKIP_ENV_VALIDATION=1");
 		expect(deployJob).toContain("pnpm install --frozen-lockfile");
 	});
@@ -25,7 +26,7 @@ describe("production deploy workflow", () => {
 		const reclaimAt = deployJob.indexOf(
 			'sudo chown -R "$' + "{DEPLOY_USER}:" + '$' + '{DEPLOY_GROUP}"',
 		);
-		const fetchAt = deployJob.indexOf("git -C \"${LIVE}\" fetch origin --prune");
+		const fetchAt = deployJob.indexOf('git -C "${LIVE}" fetch origin --prune');
 		expect(reclaimAt).toBeGreaterThan(-1);
 		expect(fetchAt).toBeGreaterThan(reclaimAt);
 	});
@@ -48,6 +49,7 @@ describe("production deploy workflow", () => {
 		expect(deployJob).toContain("Rolling back .next to previous artifact");
 		const buildAt = deployJob.indexOf("pnpm build");
 		const stopAt = deployJob.indexOf("sudo systemctl stop atom-nexst.service");
+		const migrateAt = deployJob.indexOf("pnpm db:migrate");
 		const startLabelAt = deployJob.indexOf("Starting systemd service...");
 		const startAt = deployJob.indexOf(
 			"sudo systemctl start atom-nexst.service",
@@ -55,7 +57,9 @@ describe("production deploy workflow", () => {
 		);
 		expect(buildAt).toBeGreaterThan(-1);
 		expect(stopAt).toBeGreaterThan(buildAt);
-		expect(startLabelAt).toBeGreaterThan(stopAt);
+		// Migrate runs after stop so the live pool frees DB slots.
+		expect(migrateAt).toBeGreaterThan(stopAt);
+		expect(startLabelAt).toBeGreaterThan(migrateAt);
 		expect(startAt).toBeGreaterThan(startLabelAt);
 	});