Implement command cooldown management and enhance command execution flow

- Introduced `applyCommandCooldown` function to manage per-command cooldowns after execution, improving command rate limiting.
- Updated command execution flow to include cooldown application, ensuring users are informed of cooldown status.
- Enhanced error handling in interaction replies, allowing for more graceful error management and user feedback.
- Improved the handling of interaction responses across various commands, ensuring consistent user experience.
- Added permission checks for new commands, ensuring only authorized users can execute specific actions.

apps/bot/src/modules/scheduler/service.ts

@@ -181,14 +181,29 @@ async function enqueueScheduleJob(
   return String(job.id);
 }
 
+/**
+ * Removes a scheduled/failed job if present. Locked (active) jobs cannot be
+ * removed — do not call this from inside the scheduleSend worker for the
+ * job that is currently running.
+ */
 export async function removeScheduleJob(jobId: string | null): Promise<void> {
   if (!jobId) {
     return;
   }
 
   const job = await scheduleQueue.getJob(jobId);
-  if (job) {
+  if (!job) {
+    return;
+  }
+  try {
     await job.remove();
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    if (message.includes('locked') || message.includes('could not be removed')) {
+      logger.warn({ jobId, error }, 'Schedule job is locked; skipping remove');
+      return;
+    }
+    throw error;
   }
 }
 
@@ -350,8 +365,10 @@ export async function sendScheduledMessage(context: BotContext, scheduleId: stri
     throw error;
   }
 
+  // One-shot: delete the DB row only. Do not remove the active BullMQ job
+  // from inside its own worker (locked remove throws → retry → duplicate send).
+  // removeOnComplete on enqueue cleans the job up after the processor returns.
   if (!schedule.cron) {
-    await removeScheduleJob(schedule.jobId);
     await context.prisma.scheduledMessage.delete({ where: { id: scheduleId } });
   }
 }