From 0c5b294ffc993ab20ac491ca968b49ae6bc98e4b Mon Sep 17 00:00:00 2001
From: Adam Moussa <166072409+amoussa1229@users.noreply.github.com>
Date: Wed, 15 Jul 2026 15:01:50 -0400
Subject: [PATCH] fix(infra): Aurora engine 15.4 -> 15.17 (15.4 retired by RDS,
 deploy failed) (#228)
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First prod deploy failed: RDS returned 'Cannot find version 15.4 for aurora-postgresql'
(minor version retired). Bump to latest available 15.x (15.17); stays on major 15 for
pgvector / ADR 0001. Clean create — the failed stack rolled back, no cluster persisted.
---
 infra/lib/foundation-stack.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/infra/lib/foundation-stack.ts b/infra/lib/foundation-stack.ts
index 16ade07..69ca391 100644
--- a/infra/lib/foundation-stack.ts
+++ b/infra/lib/foundation-stack.ts
@@ -94,8 +94,10 @@ export class FoundationStack extends cdk.Stack {
     // not permitted"). A distinct ID makes it a clean replace instead.
     const dbCluster = new rds.DatabaseCluster(this, 'AuroraCluster', {
       clusterIdentifier: `proposal-system-db${config.stackSuffix}`,
+      // 15.17 = latest available aurora-postgresql 15.x (15.4 was retired by RDS —
+      // "Cannot find version 15.4"). Stays on major 15 for pgvector / ADR 0001 compat.
       engine: rds.DatabaseClusterEngine.auroraPostgres({
-        version: rds.AuroraPostgresEngineVersion.VER_15_4,
+        version: rds.AuroraPostgresEngineVersion.VER_15_17,
       }),
       vpc: this.vpc,
       vpcSubnets: { subnetType: ec2.SubnetType.PRIVATE_WITH_EGRESS },