* perf: Remove no-longer-used 'backup' columns
These were added as part of the move to the v2 editor over a year ago incase any text was not correctly converted. After a year of use no cases of failed conversion have occurred that required the use of this column
* Remove migration, will do in 2-step release
* perf: Remove no-longer-used 'backup' columns
These were added as part of the move to the v2 editor over a year ago incase any text was not correctly converted. After a year of use no cases of failed conversion have occurred that required the use of this column
