Fxdreema custom block or code required

I need some one that can either create a custom block in fx dreema or some custom code that can perform the following:

Record the prices of the zig zag indicator in some type of log or something that can referenced later

No limit of historical price records in the log, but once the current price crosses above or below, delete the logged price

I'm not sure what type of function this is, but i don't want to use 1000 variables as if the current price starts trending for a couple of years, the historical price log can be quite long.