Issue#ALL-96 fix: Error & Exception Handling

src/app.controller.ts

@@ -6,10 +6,16 @@ import {
   ApiResponse,
   ApiTags,
 } from '@nestjs/swagger';
+import { InjectConnection } from '@nestjs/mongoose';
+import { Connection } from 'mongoose';
+
 @ApiTags('health')
 @Controller()
 export class AppController {
-  constructor(private readonly appService: AppService) {}
+  constructor(
+    private readonly appService: AppService,
+    @InjectConnection() private readonly mongoConnection: Connection,
+  ) {}
 
   @ApiExcludeEndpoint(true)
   @Get()
@@ -47,4 +53,35 @@ export class AppController {
       message: 'content ServiceApp is working',
     };
   }
+
+  @ApiOperation({
+    summary: 'Deep health check',
+    description: 'Returns service health including dependency status',
+  })
+  @ApiResponse({
+    status: 200,
+    description: 'Health status with dependency checks',
+    schema: {
+      type: 'object',
+      properties: {
+        status: { type: 'string', example: 'ok' },
+        services: {
+          type: 'object',
+          properties: { mongodb: { type: 'boolean' } },
+        },
+        uptime: { type: 'number' },
+        timestamp: { type: 'string' },
+      },
+    },
+  })
+  @Get('/health')
+  deepHealth() {
+    const mongoOk = this.mongoConnection.readyState === 1;
+    return {
+      status: mongoOk ? 'ok' : 'degraded',
+      services: { mongodb: mongoOk },
+      uptime: process.uptime(),
+      timestamp: new Date().toISOString(),
+    };
+  }
 }