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Italic attributes are there for providing a denormalized data view optimized for querying from external tools, directly based on the history data tables (e.g. activities can be grouped by processDefinitionId without the need for performing a join on the historic process instance table). As a consequence, the two relations are not linked in any way (i.e. no foreign key from historic activity instances to historic process instances). The same attributes and structure are reflected in the entities.

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