From ec02b57adcf54c4cc311167776b873fe1c785b05 Mon Sep 17 00:00:00 2001
From: Claude BM <claude@tsharps.com>
Date: Tue, 21 Apr 2026 09:20:11 +0000
Subject: [PATCH] Add global lock to serialize CI runs across branches

Multiple simultaneous test runs compete for PostgreSQL connections,
causing spurious errors. Global flock ensures one branch runs at a time.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 ci-runner.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ci-runner.sh b/ci-runner.sh
index 63e4e18..b0a965e 100755
--- a/ci-runner.sh
+++ b/ci-runner.sh
@@ -31,6 +31,11 @@ if ! flock -n 200; then
   exit 0
 fi
 
+# Serialize all CI runs to avoid DB connection contention
+GLOBAL_LOCK="/tmp/tsharps-ci-global.lock"
+exec 201>"$GLOBAL_LOCK"
+flock 201
+
 echo "=== TSHARPS CI Runner ==="
 echo "Branch: $BRANCH"
 echo "Commit: $COMMIT"