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zef's Time Model

The very first transaction is automatically created upon graph instantiation and is rooted to the BT.ROOT_NODE of the graph.

The zefDB user who instantiated the graph can be inferred from the very first transaction.

Any time a zefDB graph is loaded as primary instance in a process, this is considered the start of a primary session. This this is marked by a BT.PRIMARY_SESSION_STARTING_EDGE going from the BT.TX_EVENT_NODE node to the BT.ZEFDB_USER node.