Add Revit CSV preview API

src/db/repositories/external-csv-configuration.repository.ts

@@ -0,0 +1,28 @@
+import { eq } from "drizzle-orm";
+import type { ExternalCsvConfigurationReader } from "../../domain/ports/external-csv-configuration.reader.js";
+import type { AppDatabase } from "../database-context.js";
+import { externalCsvConfigurations } from "../schema/external-csv-configurations.js";
+import { projects } from "../schema/projects.js";
+
+export class ExternalCsvConfigurationRepository
+  implements ExternalCsvConfigurationReader
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  getByProject(projectId: string) {
+    const project = this.database
+      .select({ id: projects.id })
+      .from(projects)
+      .where(eq(projects.id, projectId))
+      .get();
+    if (!project) {
+      return { projectExists: false, configuration: null };
+    }
+    const configuration = this.database
+      .select()
+      .from(externalCsvConfigurations)
+      .where(eq(externalCsvConfigurations.projectId, projectId))
+      .get() ?? null;
+    return { projectExists: true, configuration };
+  }
+}