#47

backend/db/migrate/20260323192300_create_wiki_assets.rb

@@ -1,6 +1,6 @@
 class CreateWikiAssets < ActiveRecord::Migration[8.0]
   def change
-    create_table :wiki_assets, primary_key: [:wiki_page_id, :no] do |t|
+    create_table :wiki_assets do |t|
       t.references :wiki_page, null: false, foreign_key: true, index: false
       t.integer :no, null: false
       t.string :alt_text
@@ -10,6 +10,7 @@ class CreateWikiAssets < ActiveRecord::Migration[8.0]
     end
 
     add_index :wiki_assets, [:wiki_page_id, :sha256], unique: true
+    add_index :wiki_assets, [:wiki_page_id, :no], unique: true
 
     add_column :wiki_pages, :next_asset_no, :integer, null: false, default: 1
   end

backend/db/schema.rb

@@ -239,7 +239,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_23_192300) do
     t.datetime "updated_at", null: false
   end
 
-  create_table "wiki_assets", primary_key: ["wiki_page_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+  create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "wiki_page_id", null: false
     t.integer "no", null: false
     t.string "alt_text"
@@ -248,6 +248,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_23_192300) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
+    t.index ["wiki_page_id", "no"], name: "index_wiki_assets_on_wiki_page_id_and_no", unique: true
     t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
   end