acamd error writing to database

See, for example,

```
[developer@ngps ~]$ tail -f /data/20250321/logs/acamd_20250321.log |grep ERROR
2025-03-21T03:40:13.911  (Database::Database::write) ERROR from mySQL: CDK Error: Can't write message while another one is being written
2025-03-21T03:40:13.911  (Acam::Target::do_acquire) ERROR writing to database
```

which occurs while guiding.