From 5f28d1be7baee7101483462960b50f08279a55b1 Mon Sep 17 00:00:00 2001
From: "D. Berge" <dberge@aaltronav.eu>
Date: Tue, 19 Aug 2025 17:20:57 +0200
Subject: [PATCH] Don't overwrite existing comparisons unless forced.

opts.overwrite = true will cause existing comparisons to be
recomputed.
---
 lib/www/server/lib/comparisons/geometric-differences.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/www/server/lib/comparisons/geometric-differences.js b/lib/www/server/lib/comparisons/geometric-differences.js
index bed21d1..2f9f06d 100644
--- a/lib/www/server/lib/comparisons/geometric-differences.js
+++ b/lib/www/server/lib/comparisons/geometric-differences.js
@@ -439,6 +439,14 @@ async function saveGroup (group, opts = {}) {
 
 		for (const [ baselineProjectID, monitorProjectID ] of combinations(pids, 2)) {
 			try {
+				if (!opts.overwrite) {
+					const exists = await get(baselineProjectID, monitorProjectID);
+					if (exists) {
+						DEBUG("Not overwriting existing comparison between %s and %s. Skipping", baselineProjectID, monitorProjectID);
+						continue;
+					}
+				}
+
 				const isSaved = await save(baselineProjectID, monitorProjectID);
 				if (isSaved) {
 					await saveSample(baselineProjectID, monitorProjectID, opts.sampleOpts);