NOTE TO FUTURE READERS OF THIS DISCUSSION: merely changing the AUTO_INCREMENT setting is not enough. If you've added ANY products after changing the number in the database, then SEVERAL OTHER TABLES will also contain data related to those products. You'll need to use your Zen Cart admin area to delete ALL those additional products BEFORE you change the auto_increment value in the products table ... otherwise you'll have seriously corrupted data in all future product records, thus resulting in product/category/description mismatches and an inability for sales/specials and searches to work correctly.
In short, one should never mess with the raw data in the database without first having a solid understanding of what affects what.
And make REGULAR FREQUENT database backups!
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