If you make an architectural change to a table that is synced to SheetDream (an architectural change would be changing a column's underlying type, or renaming a column) it is generally a good idea to click "Purge From Cache" on the Table Preview tab in SheetDream. If you don't, SheetDream may get confused about the type of the field it's looking at when it compares your newest data with the data it has in its cache. This could lead to some unforeseen consequences for your API, like certain records having a field represented as multiple types depending on the record in question (e.g. string and number), or some records having old column data.