text: 
  import frappe
  
  def execute():
  	for table in frappe.db.sql_list("show tables"):
  		for field in frappe.db.sql("desc `%s`" % table):
  			if field[1]=="datetime":
  				frappe.db.sql("alter table `%s` change `%s` `%s` datetime(6)" % \
  					 (table, field[0], field[0]))
  			elif field[1]=="time":
  				frappe.db.sql("alter table `%s` change `%s` `%s` time(6)" % \
  					 (table, field[0], field[0]))
  