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The sync propagation now also backfills the catalog link: any inventory item with no PowderCatalogItemId that matches a catalog row by Manufacturer + ManufacturerPartNumber (the catalog SKU) gets linked and picks up the catalog price/product data. Only links on a confident match (exact SKU + matching vendor, or a single unambiguous candidate), so it never mis-links. This backfills items created before linking existed, automatically, on every environment (dev and prod) with no manual step or one-off script — legacy items link on the next sync, new items still link at create time. Cost basis, quantity, notes, and image remain untouched. Tests: links an unlinked item by manufacturer+part number; leaves it unlinked when the part number has no catalog match. Full suite 278 green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>