diff --git a/cla-backend/cla/models/dynamo_models.py b/cla-backend/cla/models/dynamo_models.py
index ac3c343c6..b8db05c92 100644
--- a/cla-backend/cla/models/dynamo_models.py
+++ b/cla-backend/cla/models/dynamo_models.py
@@ -2969,16 +2969,12 @@ def get_signatures_by_reference(
     ):
         fn = 'cla.models.dynamo_models.signature.get_signatures_by_reference'
         cla.log.debug(f'{fn} - reference_id: {reference_id}, reference_type: {reference_type},'
-                      f' project_id: {project_id}, user_ccla_company_id: {project_id},'
+                      f' project_id: {project_id}, user_ccla_company_id: {user_ccla_company_id},'
                       f' signature_signed: {signature_signed}, signature_approved: {signature_approved}')
 
         cla.log.debug(f'{fn} - performing signature_reference_id query using: {reference_id}')
         # TODO: Optimize this query to use filters properly.
         signature_generator = self.model.signature_reference_index.query(str(reference_id))
-        last_evaluated_key = signature_generator.last_evaluated_key
-        if last_evaluated_key is None:
-            cla.log.debug(f'{fn} - no last evaluated key found')
-            return []
         cla.log.debug(f'{fn} - generator.last_evaluated_key: {signature_generator.last_evaluated_key}')
 
         signatures = []
diff --git a/cla-backend/cla/models/github_models.py b/cla-backend/cla/models/github_models.py
index dbeba9fde..074785c2d 100644
--- a/cla-backend/cla/models/github_models.py
+++ b/cla-backend/cla/models/github_models.py
@@ -534,7 +534,7 @@ def update_merge_group(self, installation_id, github_repository_id, merge_group_
 
         try :
             # Get Commit authors
-            commit_authors = get_pull_request_commit_authors(pull_request, installation_id)
+            commit_authors = get_pull_request_commit_authors(pull_request)
             cla.log.debug(f'{fn} - commit authors: {commit_authors}')
         except Exception as e:
             cla.log.warning(f'{fn} - unable to load commit authors for PR {pull_request_id} from GitHub repository '
@@ -651,6 +651,9 @@ def update_change_request(self, installation_id, github_repository_id, change_re
         # Get all unique users/authors involved in this PR - returns a List[UserCommitSummary] objects
         commit_authors = get_pull_request_commit_authors(pull_request)
 
+        cla.log.debug(f'{fn} - PR: {pull_request.number}, found {len(commit_authors)} unique commit authors '
+                        f'for pull request: {pull_request.number}')
+
         try:
             # Get existing repository info using the repository's external ID,
             # which is the repository ID assigned by github.
@@ -1367,16 +1370,6 @@ def get_pull_request_commit_authors(pull_request) -> List[UserCommitSummary]:
     
     commit_authors = []
 
-    # try:
-    #     num_processes = multiprocessing.cpu_count()
-    #     cla.log.debug(f'{fn} - Number of CPUs: {num_processes}')
-
-    #     with multiprocessing.Pool(processes=num_processes) as pool:
-    #         commit_authors = pool.starmap(get_author_summary, [(commit, pull_request.number) for commit in pull_request.get_commits()])
-    
-    # except Exception as e:
-    #     cla.log.warning(f'{fn} - Exception while querying pull request commits for author information: {e}')
-    #     raise e
     with concurrent.futures.ThreadPoolExecutor(max_workers=10) as executor:
         future_to_commit = {executor.submit(get_author_summary, commit, pull_request.number): commit for commit in pull_request.get_commits()}
         for future in concurrent.futures.as_completed(future_to_commit):