openclaw - 💡(How to fix) Fix [Bug]: cron job executes multiple times (duplicate triggers)

Bug Description

Cron jobs execute multiple times when triggered, causing duplicate notifications (e.g. Feishu messages sent twice).

Steps to Reproduce

1. Set up a cron job with a simple schedule (e.g. cron=14 0 * * 2-6 for "内外价差 00:14")
2. Wait for the cron to trigger
3. Observed: the same job fires twice in ~11 seconds

Actual Behavior

Example from 2026-05-13 00:14:

• First trigger: 00:14:27 | status=ok | delivery=delivered
• Second trigger: 00:14:38 | status=ok | delivery=delivered

Same job ran twice within 11 seconds, both returned status=ok and delivered successfully.

Cron Configuration

All "内外价差" cron jobs appear to be affected (9 jobs, each with 2-3 log entries):

• 内外价差 09:14, 10:14, 11:14, 13:44, 14:44, 21:14, 22:14, 23:14, 00:14

Environment

• Runtime: agent=main | host=邬盈沣的Mac mini | os=Darwin 25.2.0
• OpenClaw version: app 2026.4.15 (2026041590)
• Node: 邬盈沣的Mac mini (192.168.31.57)

Impact

• Duplicate Feishu notifications sent to users
• Wasted API calls and compute
• Confusing for users receiving multiple identical messages

Suggested Fix

Add deduplication at the cron execution layer — if a job is already running when the next trigger fires, skip the duplicate execution rather than running it concurrently.