Implement products endpoint. price storage (with Float or Decimal as type) is not reliable yet

src/handlers/db.ts

@@ -38,3 +38,5 @@ export function handlePrismaError(errorObj: any, res: Response, source: string)
 }
 
 export default prisma;
+
+//FIXME: https://www.prisma.io/docs/orm/prisma-client/special-fields-and-types/null-and-undefined