Designing Idempotent Bulk Import Pipelines (E.164, VIN, and the Rest)

Designing Idempotent Bulk Import Pipelines (E.164, VIN, and the Rest) Bulk imports are a special category of pain. You give the user a CSV uploader, they hand you a file, and your job is to take that file from "blob of text" to "thousands of clean rows in your database." Somewhere in the middle, every assumption you have about your data falls apart. I rebuilt the bulk import system for a dealership SaaS recently. The redesign covered phone number normalization, VIN format validation, file-for...