From 16b228e54e3ff6e2ec582242f7699da0ded10f59 Mon Sep 17 00:00:00 2001
From: Maksim Eltyshev <meltyshev@gmail.com>
Date: Wed, 11 Feb 2026 11:59:57 +0100
Subject: [PATCH] fix: Prevent collisions when generating local ids

---
 client/src/utils/local-id.js      | 12 +++++++++++-
 client/src/utils/local-id.test.js |  4 ++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/client/src/utils/local-id.js b/client/src/utils/local-id.js
index ce9291ba..2af8782e 100755
--- a/client/src/utils/local-id.js
+++ b/client/src/utils/local-id.js
@@ -3,6 +3,16 @@
  * Licensed under the Fair Use License: https://github.com/plankanban/planka/blob/master/LICENSE.md
  */
 
-export const createLocalId = () => `local:${Date.now()}`;
+let lastTimestamp = 0;
+let sequence = 0;
+
+export const createLocalId = () => {
+  const timestamp = Date.now();
+
+  sequence = timestamp <= lastTimestamp ? sequence + 1 : 0;
+  lastTimestamp = timestamp;
+
+  return `local:${timestamp}-${String(sequence).padStart(4, '0')}`;
+};
 
 export const isLocalId = (id) => id.startsWith('local:');
diff --git a/client/src/utils/local-id.test.js b/client/src/utils/local-id.test.js
index 75f5f394..06a79c26 100644
--- a/client/src/utils/local-id.test.js
+++ b/client/src/utils/local-id.test.js
@@ -2,10 +2,10 @@ import { isLocalId } from './local-id';
 
 describe('isLocalId', () => {
   test('is valid', () => {
-    expect(isLocalId('local:1234567890')).toBeTruthy();
+    expect(isLocalId('local:1234567890-0000')).toBeTruthy();
   });
 
   test('is invalid', () => {
-    expect(isLocalId('1234567890')).toBeFalsy();
+    expect(isLocalId('1234567890-0000')).toBeFalsy();
   });
 });