From 5518c9523729e5c1f6cdb8dd1892ded8d0ed8c71 Mon Sep 17 00:00:00 2001
From: giles <giles.bradshaw@sigyl.com>
Date: Tue, 24 Feb 2026 17:08:00 +0000
Subject: [PATCH] Bound connection pool to prevent max_connections exhaustion

pool_size=5, max_overflow=10 per app (6 apps = 90 max connections).
Previously pool_size=0 meant unlimited connections, causing
asyncpg.TooManyConnectionsError under concurrent load.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 db/session.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/db/session.py b/db/session.py
index 8e60fae..87fd776 100644
--- a/db/session.py
+++ b/db/session.py
@@ -15,7 +15,8 @@ _engine = create_async_engine(
     future=True,
     echo=False,
     pool_pre_ping=True,
-    pool_size=0,  # 0 = unlimited (NullPool equivalent for asyncpg)
+    pool_size=5,
+    max_overflow=10,
 )
 
 _Session = async_sessionmaker(