Support IPv6 loopback in E2E database guard

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: 2 people

apps/sim/lib/billing/stripe-client-config.test.ts

@@ -19,6 +19,9 @@ const guardedEnvironment: StripeClientConfigEnvironment = {
 describe('isGuardedE2eDatabaseUrl', () => {
   it('accepts only loopback sim_e2e databases', () => {
     expect(isGuardedE2eDatabaseUrl(guardedEnvironment.DATABASE_URL)).toBe(true)
+    expect(isGuardedE2eDatabaseUrl('postgresql://sim:sim@[::1]:5432/sim_e2e_config_test')).toBe(
+      true
+    )
     expect(isGuardedE2eDatabaseUrl('postgresql://db.example.com/sim_e2e_config_test')).toBe(false)
     expect(isGuardedE2eDatabaseUrl('postgresql://127.0.0.1/sim')).toBe(false)
   })

apps/sim/lib/billing/stripe-client-config.ts

@@ -52,7 +52,7 @@ export function isGuardedE2eDatabaseUrl(databaseUrl: string | undefined): boolea
 
 function isLoopbackHostname(hostname: string): boolean {
   const normalized = hostname.toLowerCase()
-  if (normalized === 'localhost') return true
+  if (normalized === 'localhost' || normalized === '::1' || normalized === '[::1]') return true
 
   const octets = normalized.split('.')
   return (