diff --git a/apps/api/src/main/resources/db/migration/V1__init.sql b/apps/api/src/main/resources/db/migration/V1__init.sql
index a25e17e9..f201bc83 100644
--- a/apps/api/src/main/resources/db/migration/V1__init.sql
+++ b/apps/api/src/main/resources/db/migration/V1__init.sql
@@ -43,9 +43,9 @@ CREATE TABLE posts (
     author_id          UUID NOT NULL,
     text               VARCHAR(280) NOT NULL,
     created_at         TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    CONSTRAINT fk_parent_id FOREIGN KEY (parent_id) REFERENCES posts(id),
-    CONSTRAINT fk_conversation_id FOREIGN KEY (conversation_id) REFERENCES posts(id),
-    CONSTRAINT fk_author_id FOREIGN KEY (author_id) REFERENCES profiles(id)
+    CONSTRAINT fk_parent_id FOREIGN KEY (parent_id) REFERENCES posts(id) ON DELETE CASCADE,
+    CONSTRAINT fk_conversation_id FOREIGN KEY (conversation_id) REFERENCES posts(id) ON DELETE CASCADE,
+    CONSTRAINT fk_author_id FOREIGN KEY (author_id) REFERENCES profiles(id) ON DELETE CASCADE
 );
 
 CREATE TABLE post_likes (
diff --git a/apps/api/src/test/java/com/example/echo_api/modules/post/repository/PostRepositoryIT.java b/apps/api/src/test/java/com/example/echo_api/modules/post/repository/PostRepositoryIT.java
index 952d265f..553cf7b1 100644
--- a/apps/api/src/test/java/com/example/echo_api/modules/post/repository/PostRepositoryIT.java
+++ b/apps/api/src/test/java/com/example/echo_api/modules/post/repository/PostRepositoryIT.java
@@ -555,4 +555,17 @@ void PostRepository_FindPostsMentioningProfileId_ContainsOnlyPostsMentioningUser
         }
     }
 
+    @Test
+    void PostRepository_Delete_CascadeDeletesRelatedPosts() {
+        Post root = createPost(null, self.getId(), "root.");
+        Post replyToRoot = createPost(root.getId(), self.getId(), "reply to root.");
+        Post replyToReply = createPost(replyToRoot.getId(), self.getId(), "reply to reply.");
+
+        postRepository.delete(root);
+
+        assertFalse(postRepository.existsById(root.getId()));
+        assertFalse(postRepository.existsById(replyToRoot.getId()));
+        assertFalse(postRepository.existsById(replyToReply.getId()));
+    }
+
 }
\ No newline at end of file