Add number of pieces to puzzles

db/migrate/20250627070407_add_pieces_to_puzzle.rb

@@ -0,0 +1,12 @@
+class AddPiecesToPuzzle < ActiveRecord::Migration[8.0]
+  def change
+    add_column :puzzles, :pieces, :integer
+
+    Puzzle.find_each do |puzzle|
+      puzzle.pieces = 500
+      puzzle.save
+    end
+
+    change_column_null :puzzles, :pieces, false
+  end
+end