The classic Northwind sample DB (categories, customers, products, orders, order_details) seeded into a real in-browser Postgres (PGlite, WASM). Switch between a five-table JOIN exposed as a read-only VIEW and the editable base tables - each via createSqlDataSource. Sort / filter / page / edit all run as parameterized SQL; new rows get an auto id from a Postgres IDENTITY sequence. (requires @svgrid/enterprise)