AI chat layout skeleton

db/migrate/20250312152948_create_chats.rb

@@ -0,0 +1,10 @@
+class CreateChats < ActiveRecord::Migration[7.2]
+  def change
+    create_table :chats, id: :uuid do |t|
+      t.timestamps
+
+      t.references :user, null: false, foreign_key: true, type: :uuid
+      t.string :title, null: false
+    end
+  end
+end

db/migrate/20250312153208_create_messages.rb

@@ -0,0 +1,12 @@
+class CreateMessages < ActiveRecord::Migration[7.2]
+  def change
+    create_table :messages, id: :uuid do |t|
+      t.timestamps
+
+      t.references :chat, null: false, foreign_key: true, type: :uuid
+      t.string :role, null: false
+      t.text :content, null: false
+      t.boolean :debug_mode, default: false, null: false
+    end
+  end
+end

db/migrate/20250312160915_user_latest_chat.rb

@@ -0,0 +1,5 @@
+class UserLatestChat < ActiveRecord::Migration[7.2]
+  def change
+    add_reference :users, :current_chat, foreign_key: { to_table: :chats }, null: true, type: :uuid
+  end
+end