Disclosed are some implementations of systems, apparatus, methods and computer program products for transmitting data to a client device. A first database is generated for a client device and a client identifier of the client device is stored in association with the first database. The first database is transmitted to the client device responsive to receiving a first message from the client device. After transmitting the first database to the client device and responsive to receiving a second message from the client device, data relevant to the client device is ascertained. A delta between database records stored in the first database and the data is generated. A database message is generated and transmitted to the client device, where the database message indicates the delta and includes a client directive pertaining to updating the first database according to the delta.