1. A method, comprising: receiving a source set of data, wherein the source set of data comprises data representing a plurality of transactions stored in a source transaction database; receiving an estimation model for modeling data for a transaction; receiving a mapping between the source set of data and a model parameter database, wherein the model parameter database comprises a plurality of model parameters for the estimation model; using a processor to generate an updated set of model parameters, including by: determining which model parameters in the model parameter database are mapped to by the mapping; and updating those model parameters in the model parameter database which are mapped to by the mapping, without updating those model parameters in the model parameter database which are not mapped to by the mapping; and storing the updated set of model parameters in the model parameter database.