Add basic column models and script to migrate

script/migrations/populate_columns_from_workflow_stages.rb

@@ -0,0 +1,40 @@
+#!/usr/bin/env ruby
+
+require_relative "../../config/environment"
+
+ApplicationRecord.with_each_tenant do |tenant|
+  puts "Processing tenant: #{tenant}"
+
+  Collection.find_each do |collection|
+    next unless collection.workflow.present?
+
+    # Map to track stage_id -> column
+    columns_by_stage = {}
+
+    # Create columns from workflow stages
+    collection.workflow.stages.find_each do |stage|
+      column = collection.columns.create!(
+        name: stage.name,
+        color: stage.color || Card::Colored::COLORS.first
+      )
+      columns_by_stage[stage] = column
+      puts "Created column '#{column.name}' for collection '#{collection.name}'"
+    end
+
+    # Associate cards with their corresponding columns based on stages
+    collection.cards.includes(:stage).find_each do |card|
+      next unless card.stage.present?
+
+      unless card.stage.workflow.collections.include?(collection)
+        puts "Corrupt data: the card with id #{card.id} has the stage #{card.stage.name} with id #{card.stage.id} that belongs to a workflow not asociated ot its collection"
+        next
+      end
+
+      stage = columns_by_stage[card.stage]
+      card.update!(column: stage)
+      puts "Associated card ##{card.id} with column '#{stage.name}'"
+    end
+  end
+end
+
+puts "Migration completed!"