Hallo
From the Ipad running the sprinkler app (last version I assume 1.1.1) I do not see any past entry of the log, like it is empy. From the OSPi web instead I see all of them.
I just noticed this issue as well and I believe it is due to my plugin for OSPi. If I put an earlier start date, all the logs show up. I will look into it and let you know.