I have added a new row to a very big table in my debug branch and debug database.
I then updated the production table using the “schema mismatch” tool. This took many minutes.
While that was running my app (production-side) was completely down while my debug branch was running fine. I don’t think I did any other stuff to prod at this time or before.
Is this a known effect of doing the “schema mismatch” and expected? This was a shock to me!
Or did something else happen?
If this can’t be avoided, it should be documented clearly (maybe I missed it of course 
) and then going forward I can take this into account by announcing maintanence etc.