Appending on every run turns a tidy base into six copies of every row. Here is how upsert works in Airtable, and how to choose a merge key that holds up.

Stripe's dashboard exports are manual and stale the moment you download them. Here is how to keep customers, invoices and charges fresh in a sheet instead.

Every major Sheets data tool is an add-on you install, authorise and keep updated inside the spreadsheet. Here is how to schedule the same imports without one.