大修改

yelaymaths_api/src/health.controller.ts

@@ -12,7 +12,8 @@ export class HealthController {
   async health() {
     let db = 'ok';
     try {
-      await this.prisma.$queryRaw`SELECT 1`;
+      // 固定查生产库：探活关心的是主库是否可用
+      await this.prisma.main.$queryRaw`SELECT 1`;
     } catch {
       db = 'down';
     }