From aac6e59d2a66dc308e1d34a6ceb923aa1c54d706 Mon Sep 17 00:00:00 2001
From: Damon <damonkennes@gmail.com>
Date: Fri, 20 Feb 2026 11:56:30 +0100
Subject: [PATCH] OP-3743: added migration that removes double memberships

---
 CHANGELOG.md                                  |  9 +++++++
 ...120000-remove-duplicate-memberships.sparql | 26 +++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 config/migrations/2026/20260220120000-remove-duplicate-memberships.sparql

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e5f6b8..4febb50 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,13 @@
 # Changelog
+## unreleased
+### Backend
+- Related organisations: Duplicate relations between municipalities and OCMWs [OP-3743]
+
+### Deploy instructions
+```
+drc restart migrations cache
+```
+
 ## 1.38.2 (2026-02-20)
 ### Backend
 - Remove deprecated organizations-public-info producer [OP-3581]
diff --git a/config/migrations/2026/20260220120000-remove-duplicate-memberships.sparql b/config/migrations/2026/20260220120000-remove-duplicate-memberships.sparql
new file mode 100644
index 0000000..14578d7
--- /dev/null
+++ b/config/migrations/2026/20260220120000-remove-duplicate-memberships.sparql
@@ -0,0 +1,26 @@
+PREFIX org: <http://www.w3.org/ns/org#>
+PREFIX mu: <http://mu.semte.ch/vocabularies/core/>
+
+
+DELETE {
+  GRAPH <http://mu.semte.ch/graphs/administrative-unit> {
+    ?membership ?p ?o .
+  }
+}
+WHERE {
+  GRAPH <http://mu.semte.ch/graphs/administrative-unit> {
+    ?membership ?p ?o .
+  }
+
+  FILTER(?membership IN (
+    <http://data.lblod.info/id/lidmaatschap/e30da404c9e798fbf6c3cb08c18aa2fb3467fbb17d0ee3bf7aeea2e33b506394>,
+    <http://data.lblod.info/id/lidmaatschap/57e299c1371ff49f9ab4a59c04f213adb95bbd412fca118ba7b97923e8911f1e>,
+    <http://data.lblod.info/id/lidmaatschap/b5ffde4275206674ce04aec50b96055790fe2bc899688cafab5f317aa351340c>,
+    <http://data.lblod.info/id/lidmaatschap/6b63778ff8a7805b1bb6eadf016e4eb16eb5bf41>,
+    <http://data.lblod.info/id/lidmaatschap/7983bd733dd478ee37e74077a9079d34d0d2f8e1>,
+    <http://data.lblod.info/id/lidmaatschap/b9024618552754cdcf0802109404f2bb5948fe03>,
+    <http://data.lblod.info/id/lidmaatschap/ef819edf7cce76075aa41d5b42a41ad95e54c73225e1eca066352ecda3780e2a>,
+    <http://data.lblod.info/id/lidmaatschap/ce7ae35e02378f6496d02ef27a826330b22a083b>,
+    <http://data.lblod.info/id/lidmaatschap/d275f7cb4cbe0dbf5311d9015c08830a982bb7d3dca565862206d6a840b30dbf>
+  ))
+}
\ No newline at end of file