Database repository with deferred transactions

A method for selectively undoing modification to a data item, comprising:

• creating in a first memory an original version of a data item that is stored in a database server, the first memory being included in a client computer system coupled to the database server;
• making a first copy of the original version in the first memory;
• modifying said first copy of the original version in the first memory;
• creating a second copy from said original version in the first memory, when a command is received to undo said modifications;
• and
• creating a new data item in the database server from the modified first copy of the original version, when a command is received to commit said modifications.

A machine-readable medium containing instructions which, when executed by a processing system, cause the processing system to:

• create in a first memory an original version of a data item that is stored in a database server, the first memory being included in a client computer system coupled to the database server;
• make a first copy of the original version in the first memory;
• modify said first copy of the original version in the first memory;
• create a second copy from said original version in the first memory, when a command is received to undo said modifications;
• and
• create a new data item in the database server from the modified first copy of the original version, when a command is received to commit said modifications.