DEV: Move the post and topic custom fields into a table

db/migrate/20250318024953_copy_solved_topic_custom_field_to_discourse_solved_topics.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+#
+class CopySolvedTopicCustomFieldToDiscourseSolvedTopics < ActiveRecord::Migration[7.2]
+  def up
+    create_table :discourse_solved_topics do |t|
+      t.integer :topic_id, null: false
+      t.integer :answer_post_id, null: false
+      t.integer :accepter_user_id
+      t.integer :topic_timer_id
+      t.timestamps
+    end
+
+    execute <<-SQL
+      INSERT INTO discourse_solved_topics (
+        topic_id,
+        answer_post_id,
+        topic_timer_id,
+        accepter_user_id,
+        created_at,
+        updated_at
+      ) SELECT DISTINCT
+        tc.topic_id,
+        CAST(tc.value AS INTEGER),
+        CAST(tc2.value AS INTEGER),
+        ua.acting_user_id,
+        tc.created_at,
+        tc.updated_at
+      FROM topic_custom_fields tc
+      LEFT JOIN topic_custom_fields tc2
+      ON tc2.topic_id = tc.topic_id AND tc2.name = 'solved_auto_close_topic_timer_id'
+      LEFT JOIN user_actions ua
+      ON ua.target_topic_id = tc.topic_id
+      WHERE tc.name = 'accepted_answer_post_id'
+      AND ua.action_type = #{UserAction::SOLVED}
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end

db/migrate/20250318025147_add_index_for_discourse_solved_topics.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+#
+class AddIndexForDiscourseSolvedTopics < ActiveRecord::Migration[7.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :discourse_solved_topics, :topic_id, unique: true, algorithm: :concurrently
+    add_index :discourse_solved_topics, :answer_post_id, unique: true, algorithm: :concurrently
+  end
+end