chore: move memberships from shared to administrative-unit graph

These memberships can be edited by users via the related organisations
page. If this data is kept in the read-only shared graph this leads to
unexpected behaviour when users (try to) remove such a membership. More
specifically, as the user has no write acces to the graph the request will be
silently ignored and the "removed" data will simply reappear after saving the
form.

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Fix KBO statuses not being displayed [OP-3584]
 - datafix: update NIS2019 end dates and link additional NIS2025 to werkingsgebieden [part of OP-3566]
 - datafix: correct date of change event of ckb olen [OP-3594]
+- datafix: move memberships from shared to administrative unit graph
 ### Deploy Notes
 ```
 drc restart migrations; drc logs -ft --tail=200 migrations

config/migrations/2025/20250430174011-chore--move-memberships-from-shared-to-administrative-unit-graph.sparql

@@ -0,0 +1,16 @@
+PREFIX org: <http://www.w3.org/ns/org#>
+
+DELETE {
+  GRAPH <http://mu.semte.ch/graphs/shared> {
+    ?membership ?p ?o .
+  }
+} INSERT {
+  GRAPH <http://mu.semte.ch/graphs/administrative-unit> {
+    ?membership ?p ?o .
+  }
+} WHERE {
+  GRAPH <http://mu.semte.ch/graphs/shared> {
+    ?membership a org:Membership ;
+                ?p ?o .
+  }
+}