Fix creating index in migration

db/migrate/20230912172632_create_has_seen_news_popups.rb

@@ -3,8 +3,8 @@ def change
     create_table :has_seen_news_popups do |t|
       t.references :user, null: false, foreign_key: true
       t.references :news_popup, null: false, foreign_key: true
+
+      t.timestamps
     end
-
-    add_index :has_seen_news_popups, [:user, :news_popup], unique: true
   end
 end

db/migrate/20230912193144_add_index_to_has_seen_news_popups.rb

@@ -0,0 +1,5 @@
+class AddIndexToHasSeenNewsPopups < ActiveRecord::Migration[7.0]
+  def change
+    add_index :has_seen_news_popups, [:user_id, :news_popup_id], unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_09_12_172632) do
+ActiveRecord::Schema[7.0].define(version: 2023_09_12_193144) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -204,7 +204,10 @@
   create_table "has_seen_news_popups", force: :cascade do |t|
     t.bigint "user_id", null: false
     t.bigint "news_popup_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.index ["news_popup_id"], name: "index_has_seen_news_popups_on_news_popup_id"
+    t.index ["user_id", "news_popup_id"], name: "index_has_seen_news_popups_on_user_id_and_news_popup_id", unique: true
     t.index ["user_id"], name: "index_has_seen_news_popups_on_user_id"
   end