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a3ec6c7d1d
UserIdentity is a map of two fields in GetRecords responses, which
always has the same value. It may be missing, or contain a constant
object with value `{"type": "Service", "principalId":
"dynamodb.amazonaws.com"}`. Currently, the latter is set only for
`REMOVE`s triggered by TTL.
This commit introduces two new CDC operation types: `service_row_delete`
and `service_partition_delete`, emitted in place of `row_delete` and
`partition_delete`. Alternator Streams treats them as regular `REMOVE`s,
but in addition adds the `userIdentity` field to the record.
This change may break existing Scylla libraries for reading raw CDC
tables, but we doubt that anybody has this use case.
Refs https://github.com/scylladb/scylladb/pull/26149
Refs https://github.com/scylladb/scylladb/pull/26121
Fixes https://github.com/scylladb/scylladb/issues/11523
Closes scylladb/scylladb#26460