I was getting this message when I had devices that didn’t finish polling in five minutes (300s). you can check this by looking at  polling information/Per Device

From: observium [mailto:observium-bounces@observium.org] On Behalf Of Jacek Dabrowski via observium
Sent: Monday, September 02, 2019 3:54 AM
To: observium@observium.org
Cc: Jacek.Dabrowski@selgros.pl
Subject: [Observium] DB Error

Hello,

Yesterday I turned off Observium after turning on the message DB Error 1040 appears, which I can do with it ???

Pozdrawiam

Jacek Dąbrowski