DEV: update thread title prompt migration (#27052)

Add migration to handle batch processing of user options 

Co-authored-by: Osama Sayegh <asooomaasoooma90@gmail.com>

plugins/chat/db/migrate/20240409093348_add_show_thread_title_prompts_to_user_options.rb

@@ -2,6 +2,6 @@
 
 class AddShowThreadTitlePromptsToUserOptions < ActiveRecord::Migration[7.0]
   def change
-    add_column :user_options, :show_thread_title_prompts, :boolean, default: true, null: false
+    add_column :user_options, :show_thread_title_prompts, :boolean
   end
 end

plugins/chat/db/post_migrate/20240516145911_update_user_options_for_thread_title_prompts.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class UpdateUserOptionsForThreadTitlePrompts < ActiveRecord::Migration[7.0]
+  def up
+    change_column_default :user_options, :show_thread_title_prompts, true
+
+    if DB.query_single(
+         "SELECT 1 FROM user_options WHERE show_thread_title_prompts IS NULL LIMIT 1",
+       ).first
+      batch_size = 100_000
+      min_id = DB.query_single("SELECT MIN(user_id) FROM user_options").first.to_i
+      max_id = DB.query_single("SELECT MAX(user_id) FROM user_options").first.to_i
+      while max_id >= min_id
+        DB.exec(
+          "UPDATE user_options SET show_thread_title_prompts = true WHERE user_id > #{max_id - batch_size} AND user_id <= #{max_id}",
+        )
+        max_id -= batch_size
+      end
+    end
+
+    change_column_null :user_options, :show_thread_title_prompts, false
+  end
+
+  def down
+  end
+end