An old import left extra tables in this database. The shop uses only products. The tables products_old, products_2023 and tmp_import are leftovers. Look before you remove anything.

1. How many rows does products_old hold?
2. Remove tmp_import.
3. Remove products_old and products_2023 with one statement. Keep products.
4. The team rebuilds the table restock_alerts often, and its old rows do not matter. Write one script that removes restock_alerts when it exists, then creates it with three columns: product_id (whole number), min_stock (whole number) and email (text). Run the script two times. Both runs must work.