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

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

This reverts commit 1cf08c797f.

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

@@ -0,0 +1,34 @@
+import { Test, TestingModule } from '@nestjs/testing';
+
+import { EnvironmentService } from 'src/integrations/environment/environment.service';
+import { DataSourceMetadataService } from 'src/metadata/data-source-metadata/data-source-metadata.service';
+
+import { DataSourceService } from './data-source.service';
+
+describe('DataSourceService', () => {
+  let service: DataSourceService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        DataSourceService,
+        {
+          provide: EnvironmentService,
+          useValue: {
+            getPGDatabaseUrl: () => '',
+          },
+        },
+        {
+          provide: DataSourceMetadataService,
+          useValue: {},
+        },
+      ],
+    }).compile();
+
+    service = module.get<DataSourceService>(DataSourceService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});