Crashed earlier in the day, I'm guessing with the Beckhoff restart:

Jan 26 13:07:00 h1conlog1-master conlog: ../conlog.cpp: 301: process_cac_messages: MySQL Exception: Error: Out of range value for column 'value' at row 1: Error code: 1264: SQLState: 22003: Exiting.

Dave updated the channel list to remove the dust monitor channels.