How to Change Product Model Length
The default 12 character limit for product model strings may be too short for certain needs, and can be easily increased with phpMyAdmin or directly with MySQL.
Two database tables need to be modified when changing the length of the product model
field: products, and orders_products.
Using phpMyAdmin
Select the products table on the left side of phpMyAdmin
Select the product_model check box
Click on the Change button
Set the new size value under the Length/Values field, and click on the Save button. The same steps need to be reproduced for the orders_products table.
Using MySQL
alter table products change products_model products_model varchar(255);
alter table orders_products change products_model products_model varchar(255);
