FEATURE: Decouple category/tag presence in sidebar from notifi level (#17273)

db/migrate/20220628031850_create_sidebar_section_links.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class CreateSidebarSectionLinks < ActiveRecord::Migration[7.0]
+  def change
+    create_table :sidebar_section_links do |t|
+      t.integer :user_id, null: false
+      t.integer :linkable_id, null: false
+      t.string  :linkable_type, null: false
+
+      t.timestamps
+    end
+
+    add_index :sidebar_section_links, [:user_id, :linkable_type, :linkable_id], unique: true, name: 'idx_unique_sidebar_section_links'
+  end
+end