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What is a Soft Delete?
In order to propagate records that have been deleted when using Incremental Synchronization modes, records in a database may include a field that indicates that a record should be treated as if it has been removed. This is necessary because incremental synchronization does not replicate documents that are fully deleted from a source system.
For example, a boolean flag such as is_deleted could be used to indicate that a record should be treated as if it has been deleted. All queries would need to be written so as to exclude records/documents where is_deleted is set, and periodically executed background jobs can be used to remove all documents where is_deleted is set.