perf(cmpp): isolate inbound transport capacity

api/src/prisma/prisma.service.ts

@@ -6,14 +6,24 @@ import { requestContext } from '../common/request-context';
 @Injectable()
 export class PrismaService extends PrismaClient implements OnModuleDestroy {
   constructor() {
-    const databaseUrl = process.env.CMPP_PROCESS_ROLE === 'worker'
+    const workerRole = process.env.CMPP_PROCESS_ROLE === 'worker';
+    const databaseUrl = workerRole
       ? process.env.API_WORKER_DATABASE_URL || process.env.DATABASE_URL
       : process.env.DATABASE_URL;
+    const configuredPoolMax = Number(workerRole
+      ? process.env.API_WORKER_DB_POOL_MAX ?? 8
+      : process.env.API_DB_POOL_MAX ?? 32);
+    const poolMax = Number.isInteger(configuredPoolMax) && configuredPoolMax > 0
+      ? configuredPoolMax
+      : workerRole ? 8 : 32;
     super({
-      adapter: new PrismaPg(
-        databaseUrl ??
-          'postgresql://cmpp:cmpp_password@localhost:5432/cmpp_platform?schema=public',
-      ),
+      adapter: new PrismaPg({
+        connectionString: databaseUrl
+          ?? 'postgresql://cmpp:cmpp_password@localhost:5432/cmpp_platform?schema=public',
+        // API capacity must be reserved independently from the heavier Worker
+        // transactions; explicit bounds also protect PostgreSQL max_connections.
+        max: poolMax,
+      }),
     });
     const operationLog = this.operationLog;
     Object.defineProperty(this, 'operationLog', {