Save syndication sources to posts

db/migrate/20230129040028_add_syndication_sources_to_posts.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    alter_table :posts do
+      add_column :syndication_sources, :json, default: "{}"
+    end
+  end
+end