refactor: split api routes by concern

src/routes/syncRoutes.ts

@@ -0,0 +1,53 @@
+import type { Client } from "discord.js-selfbot-v13";
+import type { Router } from "express";
+import express from "express";
+import { AppError } from "../errors";
+import { createChildLogger } from "../logger";
+import { syncSelectedChannelBacklog } from "../moderation/backlogSync";
+
+const logger = createChildLogger("sync-routes");
+
+export function createSyncRoutes(client: Client): Router {
+  const router = express.Router();
+
+  // POST /api/backlog-sync - Sync message backlog for a channel
+  router.post("/backlog-sync", async (req, res, next) => {
+    try {
+      const { guildId, channelId } = req.body as {
+        guildId?: string;
+        channelId?: string;
+      };
+
+      if (!guildId || !channelId) {
+        throw new AppError(
+          "guildId and channelId are required",
+          "MISSING_BACKLOG_PARAMS",
+          400,
+        );
+      }
+
+      logger.info({ guildId, channelId }, "Starting backlog sync");
+
+      const count = await syncSelectedChannelBacklog(
+        client,
+        guildId,
+        channelId,
+      );
+
+      logger.info(
+        { guildId, channelId, messagesSync: count },
+        "Backlog sync complete",
+      );
+
+      res.json({
+        success: true,
+        channelId,
+        messagesSync: count,
+      });
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  return router;
+}