Improve exception handling: Properly raise IntegrityError exceptions

... when receiving `DuplicateKeyException` errors from CrateDB.

src/crate/client/http.py

@@ -56,6 +56,7 @@
  BlobLocationNotFoundException,
  DigestNotFoundException,
  ProgrammingError,
+ IntegrityError,
 )
 
 
@@ -191,6 +192,18 @@ def _ex_to_message(ex):
 
 
 def _raise_for_status(response):
+ """
+ Properly raise `IntegrityError` exceptions for CrateDB's `DuplicateKeyException` errors.
+ """
+ try:
+ return _raise_for_status_real(response)
+ except ProgrammingError as ex:
+ if "DuplicateKeyException" in ex.message:
+ raise IntegrityError(ex.message, error_trace=ex.error_trace) from ex
+ raise
+
+
+def _raise_for_status_real(response):
  """ make sure that only crate.exceptions are raised that are defined in
  the DB-API specification """
  message = ''