Delete dashboard duplicates on create event

Event-driven cleanup removes stale dashboard messages as soon as Discord emits messageCreate, while preserving the tracked status message.

src/channels/discord-dashboard-create-cleanup.ts

@@ -0,0 +1,55 @@
+import type { Message } from 'discord.js';
+
+import { STATUS_CHANNEL_ID } from '../config.js';
+import { DASHBOARD_STATUS_MESSAGE_MARKER } from '../dashboard-message-cleanup.js';
+import { logger } from '../logger.js';
+import { readDashboardStatusMessageId } from '../status-dashboard.js';
+
+export const DASHBOARD_TRACKED_SEND_GRACE_MS = 5000;
+
+export function isDashboardTrackedSend(jid: string, text: string): boolean {
+  return (
+    Boolean(STATUS_CHANNEL_ID) &&
+    jid.replace(/^dc:/, '') === STATUS_CHANNEL_ID &&
+    text.includes(DASHBOARD_STATUS_MESSAGE_MARKER)
+  );
+}
+
+export async function deleteOwnDashboardDuplicateOnCreate(args: {
+  message: Message;
+  channelName: string;
+  graceUntil: number;
+  now?: number;
+}): Promise<void> {
+  const { message } = args;
+  if (!STATUS_CHANNEL_ID || message.channelId !== STATUS_CHANNEL_ID) return;
+  if (!message.content.includes(DASHBOARD_STATUS_MESSAGE_MARKER)) return;
+
+  const keepMessageId = readDashboardStatusMessageId(STATUS_CHANNEL_ID);
+  if (!keepMessageId || message.id === keepMessageId) return;
+  if ((args.now ?? Date.now()) < args.graceUntil) return;
+
+  try {
+    await message.delete();
+    logger.info(
+      {
+        jid: `dc:${message.channelId}`,
+        messageId: message.id,
+        keepMessageId,
+        channelName: args.channelName,
+      },
+      'Deleted duplicate dashboard message on Discord create event',
+    );
+  } catch (err) {
+    logger.debug(
+      {
+        jid: `dc:${message.channelId}`,
+        messageId: message.id,
+        keepMessageId,
+        channelName: args.channelName,
+        err,
+      },
+      'Failed to delete duplicate dashboard message on Discord create event',
+    );
+  }
+}