chore: database cleanup script for closed events

Details:
* used on demo/dev server to periodically cleanup old&closed events

scripts/cleanup-closed.sql

@@ -0,0 +1,25 @@
+BEGIN TRANSACTION;
+
+DELETE FROM divisions
+WHERE incident_id IN (
+    SELECT id FROM incidents WHERE closed_at IS NOT NULL
+);
+
+DELETE FROM messages
+WHERE journal_id IN (
+    SELECT id FROM journals
+    WHERE incident_id IN (
+        SELECT id FROM incidents WHERE closed_at IS NOT NULL
+    )
+);
+
+DELETE FROM journals
+WHERE incident_id IN (
+    SELECT id FROM incidents WHERE closed_at IS NOT NULL
+);
+
+
+DELETE FROM incidents
+WHERE closed_at IS NOT NULL;
+
+COMMIT;