anchor.diff:  |`true`
   |The SMT removes the tombstone generated by Debezium from the stream.
   
  -|`drop.deletes`
  -|`null`
  -|*DEPRECATED* The SMT removes the `d` record generated by Debezium (and converted to tombstone by the SMT) from the stream.
  -
   |`delete.handling.mode`
   |`drop`
  -|The SMT can `drop`, `rewrite` or pass record (`none`). Rewrite mode will add `__deleted` column with true/false values based on record operation.
  +|The SMT can `drop` (the default), `rewrite` or pass delete events (`none`). The rewrite mode will add a `__deleted` column with true/false values based on record operation.
   |=======================
  
positive.code: transforms=unwrap,...
  transforms.unwrap.type=io.debezium.transforms.UnwrapFromEnvelope
  transforms.unwrap.drop.tombstones=false
  ----
  
  === Record filtering for delete records
  The SMT provides a special handling for events that signals `delete` operation.
  When a `DELETE` is executed on a datasource then Debezium generates two records:
  
  * a record with `d` operation that contains only old row data
  * a record with `null` value and the same key. This record serves as a tombstone marker for Apache Kafka for https://kafka.apache.org/documentation/#compaction[a log compaction process].
  
  Upon processing these two records, the SMT turns the `d` record into another tombstone.
  The user can configure if both records, only one of them or none is filtered out.
  
  [NOTE]
  ====
  SMT by default filters out *BOTH* delete records as the widely used sink connectors like JDBC and Elasticsearch do not support handling of tombstone records.
  ====
  
  == Configuration options
  
negative.code: [NOTE]
  ====
  This SMT is supported only for the SQL database connectors, it does not work with the MongoDB connector.
  Refer to link:/docs/configuration/mongodb-event-flattening/[MongoDB Event Flattening] for a counterpart to this SMT suitable for the Debezium MongoDB connector.
  ====
  
  Debezium generates a data change in a form of a complex message structure.
  