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I ended up having a corrupt Collection / DB record. I was tipped on another forum that the symptoms I was seeing (Nighscout web app not displaying some data, not the Heroku deploy I was attempting to work around that issue) could be caused by that. So as a last resort I dropped the entire Mongo Collection and I can now deploy Master and Dev, and it sticks in Heroku.

I don't know the significance since the data should be separate from the web app source code itself.

The whole reason I wanted to try Dev was for a fix for parts of the app not working. After initialising the Mongo DB Collection, I can use Master, so Dev (and the fix it contained) is not needed.

I know this isn't the exact root cause, but I'll leave this here in case someone comes across it and hasn't thought to look at the data.


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