Name the places and the customers
List each work area, line, delivery point and customer the way the floor names them. Every job and record then carries these details.
A complaint from one customer leads straight to that customer's batches, cooked in a named area on a named date.
Records say only 'the kitchen', so a complaint means checking a whole week of production.
Copy the details onto the record when it is made. If an area is renamed next month, last month's records must still say what was true then.