From d71795c43354ec6ba6134cf0b06ef0ba951b86d0 Mon Sep 17 00:00:00 2001
From: Livio Spring <livio.a@gmail.com>
Date: Thu, 8 May 2025 08:35:34 +0200
Subject: [PATCH] fix: remove index es_instance_position (#9862)

# Which Problems Are Solved

#9837 added a new index `es_instance_position` on the events table with
the idea to improve performance for some projections. Unfortunately, it
makes it worse for almost all projections and would only improve the
situation for the events handler of the actions V2 subscriptions.

# How the Problems Are Solved

Remove the index again.

# Additional Changes

None

# Additional Context

relates to #9837
relates to #9863
---
 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 3dd2f60abe..9d65264941 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"
+	return "54_instance_position_index_remove"
 }
diff --git a/cmd/setup/54.sql b/cmd/setup/54.sql
index 1dca8c7575..927bd2aa9b 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;