From b7346649926b4357b27aa81238eb34cebe39671b Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan.goodliffe@octal.co.uk>
Date: Tue, 5 May 2026 10:00:45 +0100
Subject: Switch to std::map for existingEntities cache

Insertion cost of flat_map too high when map grows large.
---
 src/ingestor.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ingestor.hpp b/src/ingestor.hpp
index 81041ff..dd803ce 100644
--- a/src/ingestor.hpp
+++ b/src/ingestor.hpp
@@ -8,8 +8,8 @@
 #include <connection_fwd.h>
 #include <cstdio>
 #include <expected>
-#include <flat_map>
 #include <future>
+#include <map>
 #include <scn/scan.h>
 #include <span>
 #include <sys/utsname.h>
@@ -97,7 +97,7 @@ namespace WebStat {
 		DB::ConnectionPoolPtr dbpool;
 		mutable Stats stats {};
 
-		std::flat_map<EntityHash, EntityId> existingEntities;
+		std::map<EntityHash, EntityId> existingEntities;
 		LineBatch queuedLines, processingLines;
 
 		bool terminated = false;
-- 
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