- I request historic variable instances from REST API
- I define "includeDeleted" flag (new)
- response contains deleted variable instances with their last value and indicator "DELETED"
- return fields must include variable name, last value, type, activity instance id
- add the "state" field to historic variable instance with possible values CREATED / DELETED
- remain historic variable instances in ACT_HI_VARINST table when the corresponding runtime variable instances are removed
- implement "includeDeleted" flag in HistoricVariableInstanceQuery - default 'false'