Make migrations reversible

db/migrate/20251113190256_create_search_record_shards.rb

@@ -1,7 +1,7 @@
 class CreateSearchRecordShards < ActiveRecord::Migration[8.2]
   SHARD_COUNT = 16
 
-  def up
+  def change
     # Create 16 sharded search_records tables
     SHARD_COUNT.times do |shard_id|
       create_table "search_records_#{shard_id}", id: :uuid do |t|
@@ -22,13 +22,18 @@ class CreateSearchRecordShards < ActiveRecord::Migration[8.2]
 
     # Drop old search_index tables
     SHARD_COUNT.times do |shard_id|
-      drop_table "search_index_#{shard_id}", if_exists: true
-    end
-  end
+      drop_table "search_index_#{shard_id}", if_exists: true do |t|
+        t.string :searchable_type, null: false
+        t.uuid :searchable_id, null: false
+        t.uuid :card_id, null: false
+        t.uuid :board_id, null: false
+        t.string :title
+        t.text :content
+        t.datetime :created_at, null: false
 
-  def down
-    SHARD_COUNT.times do |shard_id|
-      drop_table "search_records_#{shard_id}"
+        t.index [:searchable_type, :searchable_id], unique: true, name: "idx_si#{shard_id}_type_id"
+        t.index [:content, :title], type: :fulltext, name: "idx_si#{shard_id}_fulltext"
+      end
     end
   end
 end

db/migrate/20251114084325_drop_search_results.rb

@@ -1,5 +1,7 @@
 class DropSearchResults < ActiveRecord::Migration[8.2]
   def change
-    drop_table :search_results
+    drop_table :search_results do |t|
+      t.timestamps
+    end
   end
 end