From f97e082482cb89542f0988ce712cb058a66d8049 Mon Sep 17 00:00:00 2001
From: Jumana Bahrainwala <jzbahrai@uwaterloo.ca>
Date: Wed, 18 Oct 2023 08:14:20 -0400
Subject: [PATCH] fix index

---
 migrations/versions/0439_add_index_n_history.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/migrations/versions/0439_add_index_n_history.py b/migrations/versions/0439_add_index_n_history.py
index 8c9645d0db..b59a4ed8b4 100644
--- a/migrations/versions/0439_add_index_n_history.py
+++ b/migrations/versions/0439_add_index_n_history.py
@@ -13,12 +13,21 @@
 down_revision = "0438_sms_templates_msgs_left"
 
 
+def index_exists(name):
+    connection = op.get_bind()
+    result = connection.execute(
+        "SELECT exists(SELECT 1 from pg_indexes where indexname = '{}') as ix_exists;".format(name)
+    ).first()
+    return result.ix_exists
+
+
 # option 1
 def upgrade():
     op.execute("COMMIT")
-    op.create_index(
-        op.f("ix_notification_history_created_by_id"), "notification_history", ["created_by_id"], postgresql_concurrently=True
-    )
+    if not index_exists("ix_notification_history_created_by_id"):
+        op.create_index(
+            op.f("ix_notification_history_created_by_id"), "notification_history", ["created_by_id"], postgresql_concurrently=True
+        )
 
 
 def downgrade():