PIT: Add folder reconstruction functions

backend/src/ee/routes/v1/pit-router.ts

@@ -0,0 +1,27 @@
+import { z } from "zod";
+
+import { readLimit } from "@app/server/config/rateLimiter";
+
+export const registerPITRouter = async (server: FastifyZodProvider) => {
+  server.route({
+    method: "GET",
+    url: "/diff",
+    config: {
+      rateLimit: readLimit
+    },
+    schema: {
+      querystring: z.object({
+        fromCommit: z.string().trim(),
+        toCommit: z.string().trim()
+      }),
+      response: {
+        200: z.any()
+      }
+    },
+    handler: async (req) => {
+      const backup = await server.services.folderCommit.compareFolderStates(req.query.fromCommit, req.query.toCommit);
+
+      return backup;
+    }
+  });
+};