Preserve running task status on application restart

[Copilot]

On application restart, all tasks were unconditionally reset to idle status, causing running tasks to display incorrectly in the UI.

Changes

Added PID validation utility (back/config/util.ts)

• isPidRunning(): Uses process.kill(pid, 0) to check process existence without termination
• Validates edge cases: null, undefined, zero, negative, float values

Modified initialization logic (back/loaders/initData.ts)

• Check each task's PID before resetting status
• Preserve status for tasks with running processes
• Bulk update only tasks requiring reset (N→1 database operations)
• Fetch only id and pid fields to reduce memory overhead

// Before: unconditional reset
await CrontabModel.update({ status: CrontabStatus.idle }, { where: {} });

// After: selective reset with PID validation
const allCrons = await CrontabModel.findAll({ attributes: ['id', 'pid'], raw: true });
const idsToReset = allCrons
  .filter(cron => !(cron.pid != null && isPidRunning(cron.pid)))
  .map(cron => cron.id)
  .filter(id => id != null);

if (idsToReset.length > 0) {
  await CrontabModel.update(
    { status: CrontabStatus.idle, pid: undefined },
    { where: { id: { [Op.in]: idsToReset } } }
  );
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>运行状态异常</issue_title>
<issue_description>### Qinglong version

v2.20.0

Steps to reproduce

任务还在运行中，但是重新打开面板就会变成空闲中

What is expected?

What is actually happening?

System Info

Any additional comments?

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 运行状态异常 #2872

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Project	Deployment	Review	Updated (UTC)
qinglong	Ready	Preview, Comment	Dec 22, 2025 3:04pm
qinglong-back	Ready	Preview, Comment	Dec 22, 2025 3:04pm