Revert "Convert metadata tables to camelCase" (#2419)

Revert "Convert metadata tables to camelCase (#2400)"

This reverts commit 1cf08c797f.

server/src/metadata/data-source-metadata/data-source-metadata.service.spec.ts

@@ -0,0 +1,27 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+
+import { DataSourceMetadataService } from './data-source-metadata.service';
+import { DataSourceMetadata } from './data-source-metadata.entity';
+
+describe('DataSourceMetadataService', () => {
+  let service: DataSourceMetadataService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        DataSourceMetadataService,
+        {
+          provide: getRepositoryToken(DataSourceMetadata, 'metadata'),
+          useValue: {},
+        },
+      ],
+    }).compile();
+
+    service = module.get<DataSourceMetadataService>(DataSourceMetadataService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});