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Hi Kristin, the historical_events table stores database ids indirectly. For example, if you want to reference the project associated with a hist_project_id, you should use the hist_projects table to the id into a "real" id. The documentation for hist_project_id mentions this, but it's easy to overlook: "A reference to the primary key id column for a record in the hist_projects table". See Workgroups Database for more details.
Thanks Jeff - will try that.