you can delete a row by relations… simply create a row numbers column and one column with just the number of the row you wanna delete in the first row… then use a single value column to copy this value to the whole column… next, relate this column to row numbers column… now you have a relation that point to the number you wanna delete.
creating relations is not a simple task… it takes a few tries to get familiar with it… I suggest opening a new testing app and playing with it… in your case, I would use a single value column to get the last row number for relation