From 54554b8fb98cb160d844cdc413468e641cb0d34e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim=20M=C3=B6hlmann?= <tim+github@zitadel.com>
Date: Wed, 10 Sep 2025 12:26:22 +0300
Subject: [PATCH] perf: drop instance position index (#10626)

# Which Problems Are Solved

There was an left-behind index introduced to optimize the old and
removed event execution handler. The index confuses prostgres and it
sometimes picks this index in favor of the projection specific index.
This sometimes leads to bad query performance in the projectio handlers.

# How the Problems Are Solved

Drop the index

# Additional Changes

- none

# Additional Context

- Forgotten in https://github.com/zitadel/zitadel/pull/10564
---
 cmd/setup/54.go  | 2 +-
 cmd/setup/54.sql | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmd/setup/54.go b/cmd/setup/54.go
index e4a2e438620..1b882e8c713 100644
--- a/cmd/setup/54.go
+++ b/cmd/setup/54.go
@@ -23,5 +23,5 @@ func (mig *InstancePositionIndex) Execute(ctx context.Context, _ eventstore.Even
 }
 
 func (mig *InstancePositionIndex) String() string {
-	return "54_instance_position_index_again"
+	return "54_instance_position_index_remove_again"
 }
diff --git a/cmd/setup/54.sql b/cmd/setup/54.sql
index 1dca8c75754..927bd2aa9b7 100644
--- a/cmd/setup/54.sql
+++ b/cmd/setup/54.sql
@@ -1 +1 @@
-CREATE INDEX CONCURRENTLY IF NOT EXISTS es_instance_position ON eventstore.events2 (instance_id, position);
+DROP INDEX IF EXISTS eventstore.es_instance_position;