We added a new data administration feature to help you with maintaining your data. You can already upload data as CSV from the editor, and you can now modify data. You can find a MODIFY button in the App Data section of the Data Tab to do this.
The file you upload should contain one column with the ID of the thing you want to modify. Then values in other columns will be applied to each thing, and they should be formatted as you do with upload CSV.
One important thing to note is the box ‘Overwrite data when the field value is empty’. If this box is checked, empty values will be overwritten by an empty one if the cell is empty, while if you don’t check the box these cells will be ignored (in case of issues, keep in mind Bubble offers version control on data to recover from mistakes )