Fix data integrity of featured tags (#17712)

db/migrate/20220307094650_fix_featured_tags_constraints.rb

@@ -0,0 +1,17 @@
+class FixFeaturedTagsConstraints < ActiveRecord::Migration[6.1]
+  def up
+    safety_assured do
+      execute 'DELETE FROM featured_tags WHERE tag_id IS NULL'
+      change_column_null :featured_tags, :tag_id, false
+      execute 'DELETE FROM featured_tags WHERE account_id IS NULL'
+      change_column_null :featured_tags, :account_id, false
+    end
+  end
+
+  def down
+    safety_assured do
+      change_column_null :featured_tags, :tag_id, true
+      change_column_null :featured_tags, :account_id, true
+    end
+  end
+end