Support zero-config gateway startup

packages/gateway/src/db/client.ts

@@ -5,6 +5,16 @@ const { Pool } = pg;
 
 let pool: pg.Pool | null = null;
 
+export function isDatabaseConfigured(): boolean {
+  return Boolean(
+    process.env['DATABASE_URL']
+      || process.env['DB_HOST']
+      || process.env['DB_NAME']
+      || process.env['DB_USER']
+      || process.env['DB_PASSWORD'],
+  );
+}
+
 /**
  * Build pool config from DATABASE_URL (preferred) or individual DB_* env vars.
  * DATABASE_URL should be supplied by the runtime environment or a secret manager.
@@ -32,6 +42,9 @@ function buildPoolConfig(): pg.PoolConfig {
 }
 
 export function getPool(): pg.Pool {
+  if (!isDatabaseConfigured()) {
+    throw new Error('Database is not configured');
+  }
   if (!pool) {
     pool = new Pool(buildPoolConfig());
 
@@ -42,6 +55,13 @@ export function getPool(): pg.Pool {
   return pool;
 }
 
+export async function closePool(): Promise<void> {
+  if (pool) {
+    await pool.end();
+    pool = null;
+  }
+}
+
 export async function query<T extends pg.QueryResultRow = pg.QueryResultRow>(
   sql: string,
   params?: unknown[],

packages/gateway/src/queue/pg-boss-client.ts

@@ -1,6 +1,7 @@
 import PgBoss from 'pg-boss';
 import { logger } from '../observability/logger.js';
 import { costStream } from '../observability/cost-stream.js';
+import { isDatabaseConfigured } from '../db/client.js';
 
 const QUEUE_NAME = 'llm-batch';
 const CONCURRENCY = 4;
@@ -32,6 +33,10 @@ interface TaskResult {
 
 export async function initPgBoss(): Promise<void> {
   if (boss) return;
+  if (!isDatabaseConfigured()) {
+    logger.info('DATABASE_URL/DB_* not configured - queue disabled');
+    return;
+  }
 
   const connectionString =
     process.env['DATABASE_URL'] ??

packages/gateway/src/routes/health.ts

@@ -4,7 +4,7 @@ import { dirname, join } from 'path';
 import { readFileSync, existsSync } from 'fs';
 import { getOllamaBaseUrl } from '../pipeline/router.js';
 import { getAllBreakerStates } from '../circuit-breaker/ollama-breaker.js';
-import { query } from '../db/client.js';
+import { isDatabaseConfigured, query } from '../db/client.js';
 import { getPgBoss } from '../queue/pg-boss-client.js';
 import { logger } from '../observability/logger.js';
 
@@ -13,8 +13,8 @@ interface HealthStatus {
   timestamp: string;
   checks: {
     ollama: { status: 'ok' | 'down'; latency_ms?: number; error?: string };
-    database: { status: 'ok' | 'down'; error?: string };
+    database: { status: 'ok' | 'down' | 'disabled'; error?: string };
-    queue: { status: 'ok' | 'down' | 'unknown'; depth?: number; error?: string };
+    queue: { status: 'ok' | 'down' | 'unknown' | 'disabled'; depth?: number; error?: string };
     review_queue: { unreviewed_count: number };
     circuit_breakers: Record<string, 'closed' | 'open' | 'half-open'>;
   };
@@ -36,7 +36,10 @@ async function checkOllama(baseUrl: string): Promise<{ status: 'ok' | 'down'; la
   }
 }
 
-async function checkDatabase(): Promise<{ status: 'ok' | 'down'; error?: string }> {
+async function checkDatabase(): Promise<{ status: 'ok' | 'down' | 'disabled'; error?: string }> {
+  if (!isDatabaseConfigured()) {
+    return { status: 'disabled' };
+  }
   try {
     await withTimeout(query('SELECT 1'), 2500, 'database check timed out');
     return { status: 'ok' };
@@ -59,7 +62,8 @@ async function withTimeout<T>(promise: Promise<T>, timeoutMs: number, message: s
   }
 }
 
-async function checkQueue(): Promise<{ status: 'ok' | 'down' | 'unknown'; depth?: number; error?: string }> {
+async function checkQueue(): Promise<{ status: 'ok' | 'down' | 'unknown' | 'disabled'; depth?: number; error?: string }> {
+  if (!isDatabaseConfigured()) return { status: 'disabled' };
   const boss = getPgBoss();
   if (!boss) return { status: 'unknown' };
 
@@ -79,6 +83,7 @@ async function checkQueue(): Promise<{ status: 'ok' | 'down' | 'unknown'; depth?
 }
 
 async function getReviewQueueCount(): Promise<number> {
+  if (!isDatabaseConfigured()) return 0;
   try {
     const result = await withTimeout(
       query<{ count: string }>('SELECT COUNT(*) as count FROM review_queue WHERE decision IS NULL'),

packages/gateway/src/server.ts

@@ -16,7 +16,7 @@ import { learningInsightsRoute } from './routes/learning-insights.js';
 import { staticRoute } from './routes/static.js';
 import tenantAuth from './security/tenant-auth.js';
 import { internalRoute } from './routes/internal.js';
-import { getPool } from './db/client.js';
+import { closePool, getPool, isDatabaseConfigured } from './db/client.js';
 import { runMigrations } from './db/migrate.js';
 import { initPgBoss } from './queue/pg-boss-client.js';
 import { logger } from './observability/logger.js';
@@ -190,8 +190,7 @@ async function main() {
     logger.info({ signal }, 'Shutdown signal received');
     try {
       await server.close();
-      const pool = getPool();
+      await closePool();
-      await pool.end();
       logger.info('Server and DB connections closed');
       process.exit(0);
     } catch (err) {
@@ -207,6 +206,7 @@ async function main() {
   const host = process.env['HOST'] ?? 'localhost';
 
   try {
+    if (isDatabaseConfigured()) {
       try {
         await runMigrations();
       } catch (migErr) {
@@ -217,6 +217,9 @@ async function main() {
       } catch (pgErr) {
         logger.warn({ pgErr }, 'PgBoss init failed - continuing without queue');
       }
+    } else {
+      logger.info('DATABASE_URL/DB_* not configured - persistence and queue disabled');
+    }
     // Workspace preset (apply env defaults from workspace.yaml if present)
     try {
       const preset = await loadWorkspacePreset();
@@ -251,8 +254,10 @@ async function main() {
 
     // Adaptive routing learner (opt-in via ADAPTIVE_ROUTING_ENABLED=1)
     try {
+      if (isDatabaseConfigured()) {
         const pool = getPool();
         scheduleAdaptiveLearner(pool as never);
+      }
     } catch (err) {
       logger.warn({ err }, 'Adaptive learner scheduling failed');
     }