Fix

db/migrate/20240612000000_add_local_top_algorithm_support.rb

@@ -1,12 +1,14 @@
 # db/migrate/20240612000000_add_local_top_algorithm_support.rb
-class AddLocalTopAlgorithmSupport < ActiveRecord::Migration[6.1]
-    def change
-      # Ensure status_stats exists (Mastodon usually has this)
-      unless column_exists?(:statuses, :status_stat_id)
-        add_reference :statuses, :status_stat, foreign_key: { on_delete: :cascade }
-      end
-  
-      # Add user preference for feed algorithm (default: chronological)
-      add_column :users, :feed_algorithm, :string, default: 'chronological'
-    end
-  end
+class AddLocalTopAlgorithmSupport < ActiveRecord::Migration[8.0]
+  disable_ddl_transaction! # Allows concurrent operations
+
+  def change
+    # 1. Add reference without immediate foreign key validation
+    add_reference :statuses, :status_stat, 
+      index: { algorithm: :concurrently }, # Concurrent index
+      foreign_key: { on_delete: :cascade, validate: false } # Defer validation
+
+    # 2. Add user preference column (safe operation)
+    add_column :users, :feed_algorithm, :string, default: 'chronological'
+  end
+end