Strategy `merge` and `delete+insert`: DestinationSchemaTampered: Schema _76107128 content was changed - by a loader or by destination code

[amotl]

Problem

When testing ingestr, this error happens when validating the merge and delete+insert strategies.

time pytest -vvv -k "test_merge and duck and crate"
time pytest -vvv -k "test_delete_insert_without_primary_key and duck and crate"

dlt.pipeline.exceptions.PipelineStepFailed: Pipeline execution failed at stage load when processing package 1751728597.227432 with exception:

<class 'dlt.common.destination.exceptions.DestinationSchemaTampered'>
Schema _761071286cae94c12b6cab446cf1lfnocg0a78ff29114db2c3db51e80e5c296 content was changed - by a loader or by destination code - from the moment it was retrieved by load package. Such schema cannot reliably be updated nor saved. Current version hash: i03i7zMUw3ZWMiIn099PtaHPGdyp9YDZ5SZSiUvIctM= != stored version hash 4qvLn3v+a0GxHMr1SrjBGUra7CKttG/+wTHhu87OjUs=. If you are using destination client directly, without storing schema in load package, you should first save it into schema storage. You can also use schema._bump_version() in test code to remove modified flag.