Untie statuses from the project directly (tie to workflows)

db/migrate/20260321132125_change_task_statuses_uniqueness.rb

@@ -0,0 +1,9 @@
+class ChangeTaskStatusesUniqueness < ActiveRecord::Migration[8.1]
+  def change
+    change_table :task_statuses, bulk: true do |t|
+      t.remove_index %i[project_id name], unique: true
+      t.remove_index %i[project_id category name]
+      t.index %i[workflow_id name], unique: true
+    end
+  end
+end

db/migrate/20260321132550_add_null_false_to_task_statuses_workflow.rb

@@ -0,0 +1,5 @@
+class AddNullFalseToTaskStatusesWorkflow < ActiveRecord::Migration[8.1]
+  def change
+    change_column_null :task_statuses, :workflow_id, false
+  end
+end

db/migrate/20260321132740_drop_project_id_from_task_statuses.rb

@@ -0,0 +1,5 @@
+class DropProjectIdFromTaskStatuses < ActiveRecord::Migration[8.1]
+  def change
+    remove_reference :task_statuses, :project, foreign_key: true
+  end
+end