1. A method for providing data services to an application by a data access system, comprising: receiving, by said data access system, a mapping specification, said mapping specification correlating an application schema associated with said application with a database schema associated with a database; validating, by said data access system, that said mapping specification permits update data to losslessly roundtrip between said application and said database by: verifying, by said data access system, that an update initiated by said application according to said application schema can be: received by said data access system; modified by said data access system utilizing said mapping specification; and performed by said database without loss of said update data; and verifying, by said data access system, that a query subsequently initiated by said application according to said application schema can be: received by said data access system; modified by said data access system utilizing said mapping specification; performed by said database; and said update data returned to said application without loss of said update data; upon validating that said mapping specification permits said update data to losslessly roundtrip between said application and said database, approving subsequent use of said mapping specification by said data access system in providing data services to said application.