Systems and methods for providing a one-step API that executes a series of atomic transactions in a database system. In one implementation, each atomic transaction is associated with a forward block of code that effects changes, an undo block of code that reverses the changes made by the forward block, and a state block of code that mimics successful execution of the forward block by setting internal states. In the event of a failure, the forward blocks, undo blocks, and state blocks can be used to roll forward or roll back changes as a whole. In one implementation, a one-step API for replicating data in a database is provided.