Workflow model

db/migrate/20260321114951_create_workflows.rb

@@ -0,0 +1,14 @@
+class CreateWorkflows < ActiveRecord::Migration[8.1]
+  def change
+    create_table :workflows do |t|
+      t.belongs_to :project, null: false, foreign_key: true
+      t.string :name, null: false
+      t.string :icon, null: false
+      t.string :color, null: false
+
+      t.index %i[project_id name], unique: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20260321115521_add_workflow_id_to_statuses_and_tasks.rb

@@ -0,0 +1,6 @@
+class AddWorkflowIdToStatusesAndTasks < ActiveRecord::Migration[8.1]
+  def change
+    add_belongs_to :tasks, :workflow
+    add_belongs_to :task_statuses, :workflow
+  end
+end