From efe9437f20f47a36585b80ee077d36151ff42da1 Mon Sep 17 00:00:00 2001
From: czlonkowski <56956555+czlonkowski@users.noreply.github.com>
Date: Wed, 12 Nov 2025 16:39:06 +0100
Subject: [PATCH] fix: correct SQL syntax for expression index in
 workflow_mutations schema
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The expression index for significant changes needs double parentheses
around the arithmetic expression to be valid PostgreSQL syntax.

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
---
 docs/migrations/workflow_mutations_schema.sql | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/migrations/workflow_mutations_schema.sql b/docs/migrations/workflow_mutations_schema.sql
index 9d5e83a..b6388be 100644
--- a/docs/migrations/workflow_mutations_schema.sql
+++ b/docs/migrations/workflow_mutations_schema.sql
@@ -120,9 +120,9 @@ CREATE INDEX IF NOT EXISTS idx_workflow_mutations_validation_success
 CREATE INDEX IF NOT EXISTS idx_workflow_mutations_user_time
   ON workflow_mutations(user_id, created_at DESC);
 
--- Find mutations with significant changes
+-- Find mutations with significant changes (expression index)
 CREATE INDEX IF NOT EXISTS idx_workflow_mutations_significant_changes
-  ON workflow_mutations(nodes_added + nodes_removed + nodes_modified)
+  ON workflow_mutations((nodes_added + nodes_removed + nodes_modified))
   WHERE (nodes_added + nodes_removed + nodes_modified) > 0;
 
 -- Comments for documentation