refactor(database): increase Prisma connection pool limits for improved test performance

apps/api/src/services/__tests__/SecurityService.test.ts

@@ -50,11 +50,7 @@ describe('SecurityService', () => {
     const complainedCount = opts?.complainedCount ?? 0;
     const createdAt = opts?.createdAt ?? new Date();
 
-    const emails = [];
-    for (let i = 0; i < count; i++) {
-      emails.push(
-        prisma.email.create({
-          data: {
+    const data = Array.from({length: count}, (_, i) => ({
       projectId,
       contactId,
       subject: `Test ${i}`,
@@ -66,11 +62,8 @@ describe('SecurityService', () => {
       createdAt,
       bouncedAt: i < bouncedCount ? createdAt : null,
       complainedAt: i >= bouncedCount && i < bouncedCount + complainedCount ? createdAt : null,
-          },
-        }),
-      );
-    }
-    await Promise.all(emails);
+    }));
+    await prisma.email.createMany({data});
   }
 
   describe('Rate-based checks (existing behavior)', () => {

test/helpers/database.ts

@@ -16,18 +16,21 @@ class TestDatabase {
       throw new Error('DATABASE_URL or TEST_DATABASE_URL must be set for testing');
     }
 
-    // Create Prisma client with connection pool limits
+    // Raise Prisma's connection pool above its default (num_cpus * 2 + 1, ~5 on CI).
+    // Bulk inserts in some tests (e.g. SecurityService) saturate the default pool
+    // and time out. Test Postgres has max_connections=100, so 20 is well under budget.
+    const url = new URL(databaseUrl);
+    if (!url.searchParams.has('connection_limit')) {
+      url.searchParams.set('connection_limit', '20');
+    }
+    if (!url.searchParams.has('pool_timeout')) {
+      url.searchParams.set('pool_timeout', '20');
+    }
+
     this.prisma = new PrismaClient({
       datasources: {
         db: {
-          url: databaseUrl,
-        },
-      },
-      // Limit connection pool to prevent memory issues in tests
-      // @ts-ignore - These options exist but may not be in types
-      __internal: {
-        engine: {
-          connection_limit: 5,
+          url: url.toString(),
         },
       },
     });