1:1 METHOD sync()
  2:3 EXPR INSERT Product { sku: "A1", price: 10 }
  3:3 DB_STUB IDENT(select) IDENT(Product) LBRACE IDENT(sku) EQEQ STR(A1) RBRACE
  4:3 LET rows = DB_STUB(IDENT(select) IDENT(Product) LBRACE IDENT(price) GT INT(5) RBRACE)
  5:3 EXPR INSERT Product { sku: "A2" }
  6:3 DB_STUB KW_SELECT IDENT(Product) LBRACE IDENT(sku) EQEQ STR(A2) RBRACE