Anything in default_options() is not taken over to the pipeline by default. Pipeline wide parameters should be passed into the appropriate method to be set in meta

Switching the logic around a little bit here to get rid of single | or statements and an xor which I think has caused issues somewhere in our pipelines

when looping, if looking for previous_dbname, would always be defined because of the last loop, so comparing the wrong databases

default value is core, so running without specifying anything will be as before