fix(ordrestyring): preserve preflight database adapter (#40)

* [verified] fix(ordrestyring): initialize database before preflight

* [verified] fix(ordrestyring): preserve promise pool preflight adapter

* test(ordrestyring): support pool-only service adapters

---------

Co-authored-by: alexpolo1 <[email protected]>

backend/src/services/__tests__/ordrestyringReadModel.test.js

@@ -14,6 +14,20 @@ describe('consumer read model safety contract', () => {
     databaseService.pool = { execute: jest.fn().mockResolvedValue([[{ case_number: 'A' }]]) };
     await expect(readModel.cases(['A'])).resolves.toEqual([{ case_number: 'A' }]);
   });
+  test('keeps mysql promise pools on their promise execute adapter', async () => {
+    const execute = jest.fn().mockResolvedValue([[{ case_number: 'A' }]]);
+    const pool = { pool: { execute: jest.fn() }, execute, query: jest.fn() };
+    await expect(new OrdrestyringReadModel(pool, { env: {} }).cases(['A']))
+      .resolves.toEqual([{ case_number: 'A' }]);
+    expect(execute).toHaveBeenCalledTimes(1);
+    expect(pool.query).not.toHaveBeenCalled();
+  });
+  test('supports lightweight service wrappers that expose only pool.execute', async () => {
+    const execute = jest.fn().mockResolvedValue([[{ case_number: 'A' }]]);
+    await expect(new OrdrestyringReadModel({ pool: { execute } }, { env: {} }).cases(['A']))
+      .resolves.toEqual([{ case_number: 'A' }]);
+    expect(execute).toHaveBeenCalledTimes(1);
+  });
   test('canonical default, domain override and invalid modes fail closed', async () => {
     expect(model().mode('planning')).toBe('canonical');
     expect(model([], { env: { ORDRESTYRING_READ_MODE: 'compare', ORDRESTYRING_READ_MODE_HISTORY: 'legacy' } }).mode('history')).toBe('legacy');

backend/src/services/ordrestyringReadModel.js

@@ -80,10 +80,12 @@ class OrdrestyringReadModel {
 
   async rows(sql, params = []) {
     if (this.connection && Object.prototype.hasOwnProperty.call(this.connection, 'pool')
-      && typeof this.connection.query === 'function') {
+      && typeof this.connection.query === 'function' && typeof this.connection.execute !== 'function') {
       return this.connection.query(sql, params);
     }
-    const connection = this.connection?.pool || this.connection;
+    const connection = typeof this.connection?.execute === 'function'
+      ? this.connection
+      : this.connection?.pool || this.connection;
     if (!connection) throw new Error('Ordrestyring canonical database unavailable');
     if (connection.execute) {
       const [rows] = await connection.execute(sql, params);