fix: release() absichern, DATABASE_URL Startup-Check, execute-Test hinzugefügt

src/server/db/client.ts

@@ -1,5 +1,9 @@
 import { Pool, type QueryResultRow } from 'pg'
 
+if (!process.env.DATABASE_URL) {
+  throw new Error('DATABASE_URL muss gesetzt sein')
+}
+
 export const pool = new Pool({ connectionString: process.env.DATABASE_URL })
 
 pool.on('error', (err) => {

src/server/db/tenant.test.ts

@@ -53,13 +53,15 @@ describe('withTenant', () => {
     ).rejects.toThrow('Ungültige tenantId')
   })
 
-  it('gibt dieselbe Client-Instanz an fn weiter (Connection-Isolation)', async () => {
-    let capturedClient: unknown
-    await withTenant('tenant1', async (client) => {
-      capturedClient = client
-    })
-    // Client muss nach withTenant released worden sein
+  it('released PoolClient nach Ausführung', async () => {
+    await withTenant('tenant1', async () => {})
     expect(mockClient.release).toHaveBeenCalledOnce()
-    expect(capturedClient).toBeDefined()
+  })
+
+  it('execute delegiert an den dedizierten PoolClient', async () => {
+    await withTenant('abc123', async (client) => {
+      await client.execute('DELETE FROM sessions WHERE expired = true')
+    })
+    expect(mockClient.query).toHaveBeenCalledWith('DELETE FROM sessions WHERE expired = true')
   })
 })

src/server/db/tenant.ts

@@ -29,6 +29,10 @@ export async function withTenant<T>(
     } catch (resetErr) {
       console.error({ msg: 'search_path reset failed', error: (resetErr as Error).message })
     }
-    client.release()
+    try {
+      client.release()
+    } catch (releaseErr) {
+      console.error({ msg: 'Pool client release failed', error: (releaseErr as Error).message })
+    }
   }
 }