feat(tasks): implement long-term delayed tasks with KV and Cron

src/libs/tasks/queueTask.ts

@@ -39,6 +39,41 @@ export async function queueTask(
     body,
     req?.header(),
   );
+
+  const MAX_DELAY_SECONDS = 12 * 60 * 60; // 43,200 seconds (12 hours)
+
+  // If delay exceeds 12 hours, store in KV for later processing
+  if (scheduleTime > MAX_DELAY_SECONDS) {
+    if (!env || !env.DELAYED_TASKS) {
+      throw new Error("DELAYED_TASKS KV namespace not available");
+    }
+
+    const { generateTaskKey, serializeDelayedTask } = await import(
+      "./delayedTask"
+    );
+    const taskId = crypto.randomUUID();
+    const scheduledEpochTime = Math.floor(Date.now() / 1000) + scheduleTime;
+
+    const metadata = {
+      queueName,
+      body,
+      headers,
+      scheduledEpochTime,
+      taskId,
+      createdAt: Math.floor(Date.now() / 1000),
+      retryCount: 0,
+    };
+
+    const key = generateTaskKey(scheduledEpochTime, taskId);
+    await env.DELAYED_TASKS.put(key, serializeDelayedTask(metadata));
+
+    console.log(
+      `Task stored in KV for delayed execution. Scheduled for: ${new Date(scheduledEpochTime * 1000).toISOString()}, Key: ${key}`,
+    );
+    return;
+  }
+
+  // Otherwise, queue directly
   const contentType =
     headers["Content-Type"] === "application/json" ? "json" : "text";
   if (!env) {
@@ -85,10 +120,12 @@ function buildTask(
   if (scheduleConfig) {
     const { delay, epochTime } = scheduleConfig;
     if (epochTime) {
+      console.log("epochTime", epochTime);
       scheduleTime = DateTime.fromSeconds(epochTime)
         .diffNow("second")
         .as("second");
     } else if (delay) {
+      console.log("delay", delay);
       scheduleTime = Duration.fromDurationLike(delay).as("second");
     }
   }