Refactor tenant ORM integration (#1650)

* Refactor tenant ORM integration

* fix tests

server/src/tenant/metadata/metadata.controller.ts

@@ -0,0 +1,46 @@
+import { Controller, Get, UseGuards } from '@nestjs/common';
+
+import { Workspace } from '@prisma/client';
+import { EntitySchema } from 'typeorm';
+
+import { AuthWorkspace } from 'src/decorators/auth-workspace.decorator';
+import { JwtAuthGuard } from 'src/guards/jwt.auth.guard';
+
+import { DataSourceMetadataService } from './data-source-metadata/data-source-metadata.service';
+import { EntitySchemaGeneratorService } from './entity-schema-generator/entity-schema-generator.service';
+import { DataSourceService } from './data-source/data-source.service';
+
+@UseGuards(JwtAuthGuard)
+@Controller('metadata')
+export class MetadataController {
+  constructor(
+    private readonly entitySchemaGeneratorService: EntitySchemaGeneratorService,
+    private readonly dataSourceMetadataService: DataSourceMetadataService,
+    private readonly dataSourceService: DataSourceService,
+  ) {}
+
+  @Get()
+  async getMetadata(@AuthWorkspace() workspace: Workspace) {
+    const dataSourcesMetadata =
+      await this.dataSourceMetadataService.getDataSourcesMedataFromWorkspaceId(
+        workspace.id,
+      );
+
+    const entities: EntitySchema<{
+      id: unknown;
+    }>[] = [];
+
+    for (const dataSource of dataSourcesMetadata) {
+      const dataSourceEntities =
+        await this.entitySchemaGeneratorService.getTypeORMEntitiesByDataSourceId(
+          dataSource.id,
+        );
+
+      entities.push(...dataSourceEntities);
+    }
+
+    this.dataSourceService.connectToWorkspaceDataSource(workspace.id);
+
+    return entities;
+  }
+}