diff --git a/docs/architecture/db/db-orm.puml b/docs/architecture/db/db-orm.puml
index cb37a60f..48578048 100644
--- a/docs/architecture/db/db-orm.puml
+++ b/docs/architecture/db/db-orm.puml
@@ -260,7 +260,7 @@ package "Transcription" {
 
   entity transcription_block_mentioned_persons {
     block_id : UUID <<FK>>
-    person_id : UUID NOT NULL
+    person_id : UUID NOT NULL <<FK>>
     --
     display_name : VARCHAR(200) NOT NULL
   }
@@ -386,9 +386,9 @@ invite_token_group_ids }o--|| invite_tokens : invite_token_id
 invite_token_group_ids }o--|| user_groups : group_id
 
 ' Document relationships
-documents }o--o| persons : sender_id
+documents }o--o| persons : sender_id (ON DELETE SET NULL)
 document_receivers }o--|| documents : document_id
-document_receivers }o--|| persons : person_id
+document_receivers }o--|| persons : person_id (ON DELETE CASCADE)
 document_tags }o--|| documents : document_id
 document_tags }o--|| tag : tag_id
 document_versions }o--|| documents : document_id
@@ -420,6 +420,7 @@ transcription_blocks }o--o| app_users : updated_by
 transcription_block_versions }o--|| transcription_blocks : block_id
 transcription_block_versions }o--o| app_users : changed_by
 transcription_block_mentioned_persons }o--|| transcription_blocks : block_id
+transcription_block_mentioned_persons }o--|| persons : person_id (ON DELETE CASCADE)
 
 ' OCR relationships
 ocr_job_documents }o--|| ocr_jobs : job_id
diff --git a/docs/architecture/db/db-relationships.puml b/docs/architecture/db/db-relationships.puml
index d6f4b542..82056761 100644
--- a/docs/architecture/db/db-relationships.puml
+++ b/docs/architecture/db/db-relationships.puml
@@ -79,9 +79,9 @@ invite_token_group_ids }o--|| invite_tokens : invite_token_id
 invite_token_group_ids }o--|| user_groups : group_id
 
 ' Document relationships
-documents }o--o| persons : sender_id
+documents }o--o| persons : sender_id (ON DELETE SET NULL)
 document_receivers }o--|| documents : document_id
-document_receivers }o--|| persons : person_id
+document_receivers }o--|| persons : person_id (ON DELETE CASCADE)
 document_tags }o--|| documents : document_id
 document_tags }o--|| tag : tag_id
 document_versions }o--|| documents : document_id
@@ -113,6 +113,7 @@ transcription_blocks }o--o| app_users : updated_by
 transcription_block_versions }o--|| transcription_blocks : block_id
 transcription_block_versions }o--o| app_users : changed_by
 transcription_block_mentioned_persons }o--|| transcription_blocks : block_id
+transcription_block_mentioned_persons }o--|| persons : person_id (ON DELETE CASCADE)
 
 ' OCR relationships
 ocr_job_documents }o--|| ocr_jobs : job_id