fix: Einzelner shared Pool, finally-Block verschluckt nicht Original-Fehler, Pool-Error-Handler

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/server/db/client.ts

@@ -1,6 +1,10 @@
 import { Pool, type QueryResultRow } from 'pg'
 
-const pool = new Pool({ connectionString: process.env.DATABASE_URL })
+export const pool = new Pool({ connectionString: process.env.DATABASE_URL })
+
+pool.on('error', (err) => {
+  console.error({ msg: 'Idle pool connection error', error: err.message })
+})
 
 export const db = {
   execute: (sql: string) => pool.query(sql),

src/server/db/tenant.test.ts

@@ -1,15 +1,15 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest'
 
-// Pool mocken — gibt einen fake PoolClient zurück
+// Pool aus client.ts mocken — gibt einen fake PoolClient zurück
 const mockClient = vi.hoisted(() => ({
   query: vi.fn(),
   release: vi.fn(),
 }))
 
-vi.mock('pg', () => ({
-  Pool: vi.fn().mockImplementation(() => ({
+vi.mock('./client', () => ({
+  pool: {
     connect: vi.fn().mockResolvedValue(mockClient),
-  })),
+  },
 }))
 
 import { withTenant } from './tenant'

src/server/db/tenant.ts

@@ -1,6 +1,5 @@
-import { Pool, type QueryResultRow } from 'pg'
-
-const pool = new Pool({ connectionString: process.env.DATABASE_URL })
+import { type QueryResultRow } from 'pg'
+import { pool } from './client'
 
 interface TenantClient {
   execute: (sql: string) => Promise<void>
@@ -25,7 +24,11 @@ export async function withTenant<T>(
     }
     return await fn(tenantClient)
   } finally {
+    try {
       await client.query('SET search_path = public')
+    } catch (resetErr) {
+      console.error({ msg: 'search_path reset failed', error: (resetErr as Error).message })
+    }
     client.release()
   }
 }