This PR removes the polymorphic
Content field (that contained a binary blob describing the paste content) with two dedicated fields for the paste
FileUpload. In the
FileUpload case, the actual foreign key field is added on
While writing the migration code, it turned out that there seems to be a bug in GORM, where a nil pointer deference happens every time you try to drop a column. The unfortunate workaround is to not drop any columns.