Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Add valid master records from Excel and flag row errors.
Get valid Excel rows into PostgreSQL and a chat report showing how many went in and what needs fixing.
Match customer IDs and protect the list from duplicate entries.
See new and changed customers in your list, plus a report of entries needing your review after a JSON export.