old_contents: import frappe
  
  
  def execute():
      frappe.reload_doc("manufacturing", "doctype", "bom_operation")
      frappe.reload_doc("manufacturing", "doctype", "work_order_operation")
  
      frappe.db.sql("""
          UPDATE
              `tabBOM Operation` bo
          SET
              bo.batch_size = 1
      """)
      frappe.db.sql("""
          UPDATE
              `tabWork Order Operation` wop
          SET
              wop.batch_size = 1
      """)
      frappe.db.commit()
  
new_contents: import frappe
  
  
  def execute():
      frappe.reload_doc("manufacturing", "doctype", "bom_operation")
      frappe.reload_doc("manufacturing", "doctype", "work_order_operation")
  
      frappe.db.sql("""
          UPDATE
              `tabBOM Operation` bo
          SET
              bo.batch_size = 1
      """)
      frappe.db.sql("""
          UPDATE
              `tabWork Order Operation` wop
          SET
              wop.batch_size = 1
      """)
  
subject: remove explicit commit call