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Supplier CSV and XLSX uploads need a reviewed column mapping before they become catalog records. This example uses SvelteKit, Superforms, shadcn-svelte/Bits UI and Uppy with Papa Parse and the official SheetJS CE distribution to stage files in ClickHouse Managed Postgres, show row errors and atomically promote a valid batch. File fingerprints, locked reviews and supplier/SKU constraints prevent duplicate or partial imports.
Includes both real file fixtures, explicit clickhousectl setup and cleanup, restricted runtime roles, screenshots and scoped CI.
Validation: clean locked install, four parser tests, typecheck and production build in Ubuntu 24.04 ARM64; actual Postgres 18.6 integration covering concurrent review/read snapshots, upload/promotion replay, rollback, denied grants and wrong-CA/hostname rejection through pg. Chromium exercised both Uppy upload formats, invalid mapping/rows, conflict rollback, replay and persistence after replacing the app process. The owned disposable managed service was deleted and verified absent; the VM is stopped.