{"action":"created","comment":{"url":"https://api.github.com/repos/CartoDB/cartodb/pulls/comments/59183634","id":59183634,"diff_hunk":"@@ -0,0 +1,24 @@\n+Sequel.migration do\n+  up do\n+    alter_table(:permissions) do\n+      drop_column :entity_id\n+      drop_column :entity_type\n+    end\n+  end\n+\n+  down do\n+    alter_table(:permissions) do\n+      add_column :entity_id, :uuid\n+      add_column :entity_type, :text\n+    end\n+    Rails::Sequel.connection.run(%{\n+      UPDATE permissions SET entity_id = visualizations.id, entity_type = 'vis'\n+      FROM visualizations\n+      WHERE permissions.id = visualizations.permission_id })\n+    Rails::Sequel.connection.run('DELETE FROM permissions WHERE entity_id IS 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it looks ok, since this deletion and not null is not actually _needed_ and we'd probably review and retry doing this, consider don't deleting anything (maybe it's an unnecessary risk).","created_at":"2016-04-11T10:27:40Z","updated_at":"2016-04-11T10:27:40Z","html_url":"https://github.com/CartoDB/cartodb/pull/7079#discussion_r59183634","pull_request_url":"https://api.github.com/repos/CartoDB/cartodb/pulls/7079","_links":{"self":{"href":"https://api.github.com/repos/CartoDB/cartodb/pulls/comments/59183634"},"html":{"href":"https://github.com/CartoDB/cartodb/pull/7079#discussion_r59183634"},"pull_request":{"href":"https://api.github.com/repos/CartoDB/cartodb/pulls/7079"}}},"pull_request":{"url":"https://api.github.com/repos/CartoDB/cartodb/pulls/7079","id":65649913,"html_url":"https://github.com/CartoDB/cartodb/pull/7079","diff_url":"https://github.com/CartoDB/cartodb/pull/7079.diff","patch_url":"https://github.com/CartoDB/cartodb/pull/7079.patch","issue_url":"https://api.github.com/repos/CartoDB/cartodb/issues/7079","number":7079,"state":"open","locked":false,"title":"Add migration to drop extra fields from 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