Add migration to fix hide_mail attribute again

db/migrate/20211118203332_clean_hide_mail.rb

@@ -0,0 +1,19 @@
+class CleanHideMail < ActiveRecord::Migration[6.1]
+  def up
+    execute <<~SQL.squish
+      UPDATE user_preferences
+      SET settings =  settings - 'hide_mail' || '{"hide_mail": false}'
+      WHERE settings ->> 'hide_mail' = '0'
+    SQL
+
+    execute <<~SQL.squish
+      UPDATE user_preferences
+      SET settings =  settings - 'hide_mail' || '{"hide_mail": true}'
+      WHERE settings ->> 'hide_mail' = '1'
+    SQL
+  end
+
+  def down
+    # Nothing to do
+  end
+end