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Append sourced schedule, lease and milestone updates to existing projects. Earlier records remain in their history.
Prepare a sourced update batch with EBIGRAPH, then upload or paste it. Existing project and publisher keys are required. Each update has its own source date, scope and typed details.
Use schedule_change for planned delivery windows, lease_change for reported contract terms, and milestone for planned or company-reported accomplishments. Publication dates are separate from event dates; leave event_on null when unstated. Explicit supersession is allowed only between updates for the same project, type and scope. Capacity claims cannot be replaced here.
The preview checks typed fields, publisher attribution and history links. It does not verify the source contents or establish project operation.
Validate a batch to see its proposed records.