From b8fcb1f23d394ceac010a7d1b5b702a0e1671ae8 Mon Sep 17 00:00:00 2001
From: Akhil S <52134111+akhil018@users.noreply.github.com>
Date: Wed, 20 Dec 2023 23:31:13 +0530
Subject: [PATCH] Add index to foreign key(parent_id) column for optimized
 record deletion

This commit addresses performance issues related to both record deletion and retrieval in the sqlalchemy_mptt library. Adding an index to the foreign key(parent_id) column improves the efficiency of both operations, significantly reducing the time taken for deletion and retrieval.
---
 sqlalchemy_mptt/mixins.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sqlalchemy_mptt/mixins.py b/sqlalchemy_mptt/mixins.py
index 5cdda2d..5cd5b9a 100644
--- a/sqlalchemy_mptt/mixins.py
+++ b/sqlalchemy_mptt/mixins.py
@@ -86,6 +86,7 @@ def parent_id(cls):
             ForeignKey(
                 "{}.{}".format(cls.__tablename__, pk.name), ondelete="CASCADE"
             ),
+            index=True
         )
 
     @declared_attr