fix(api): ON DELETE CASCADE for todos

- Delete todos when the user associated with it are deleted
- Updated tests to reflect new changes

backend/tests/test_model_member.py

@@ -2,6 +2,7 @@ import pytest
 from psycopg.errors import UniqueViolation
 
 from src.neo_neo_todo.models.member import (
+    delete_member,
     insert_member,
     select_member_by_email,
     select_member_by_id,
@@ -27,7 +28,7 @@ async def test_model_member_insert(db_pool):
         db_pool, "member_inserted@todo.test", "alkasdjfhasldkfjh12341238989"
     )
     assert member is not None
-    assert member.id == 2
+    assert member.id == 3
     assert member.email == "member_inserted@todo.test"
     assert member.password_hash == "alkasdjfhasldkfjh12341238989"
 
@@ -63,3 +64,13 @@ async def test_model_member_email_verified(db_pool):
     )
 
     assert update_member_email_verified_fail is False
+
+
+async def test_model_member_delete_member(db_pool):
+    deletion_success = await delete_member(db_pool, id=2)
+
+    assert deletion_success
+
+    deletion_fail = await delete_member(db_pool, id=99)
+
+    assert not deletion_fail