import frappe


def execute():
	"""SB Process.status now defaults to 'Unknown' for new records, but existing
	records created before that default was added are still NULL/blank — which
	silently falls outside the Pass/Fail/Unknown breakdown shown on the dashboard.
	Backfill them so every record has one of exactly the three valid statuses."""
	frappe.db.sql("""
		UPDATE `tabSB Process`
		SET status = 'Unknown'
		WHERE status IS NULL OR status = ''
	""")