From e89ac9cec5dbde327c408b6e0f35e5c17f358e3d Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sat, 17 Oct 2026 10:25:53 +0200
Subject: admin-tools: add method to delete duplicates

---
 admin-tools.html   |  1 +
 src/admin-tools.js | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/admin-tools.html b/admin-tools.html
index 7f3b3bc..fc118e0 100644
--- a/admin-tools.html
+++ b/admin-tools.html
@@ -27,6 +27,7 @@
 		</div>
 		<button id="print-ids">StudentIds</button>
 		<button id="find-duplicates">Finde Duplikate</button>
+		<button id="delete-duplicates">Lösche Duplikate</button>
 		<button id="export-graduation-dbs">Exportiere Graduation Dbs</button>
 	</body>
 </html>
diff --git a/src/admin-tools.js b/src/admin-tools.js
index b3135b1..858ec6d 100644
--- a/src/admin-tools.js
+++ b/src/admin-tools.js
@@ -111,6 +111,36 @@ async function findAllDuplicates() {
 	}
 }
 
+async function deleteAllDuplicates() {
+	output("loading courses ...");
+	const courses = await fetchCourses("SOL Graduierung");
+	output(`searching in ${courses.length} courses ... `);
+	const promises = [];
+	for (const course of courses) {
+		promises.push(findDuplicates(course));
+	}
+
+	const allDuplicates = await Promise.all(promises);
+
+	const deletePromises = [];
+	for (const [course, courseDuplicates] of allDuplicates) {
+		const toDelete = [];
+		for (const duplicates of courseDuplicates) {
+			for (let i = duplicates.length - 1; i > 0; i--) {
+				toDelete.push(duplicates[i].changeId);
+			}
+		}
+		output(`${course.title}: Deleting ${toDelete}`);
+		deletePromises.push(
+			(async function () {
+				const dbActivity = await course.getActivity("Graduation");
+				const db = new DB(dbActivity.id);
+				await db.deleteEntries(toDelete);
+			})(),
+		);
+	}
+}
+
 async function exportGraduations(course) {
 	const dbActivity = await course.getActivity("Graduation");
 	const db = new DB(dbActivity.id);
@@ -151,6 +181,7 @@ async function init() {
 		output(JSON.stringify(students.map((s) => s.id)));
 	});
 	document.getElementById("find-duplicates").addEventListener("click", findAllDuplicates);
+	document.getElementById("delete-duplicates").addEventListener("click", deleteAllDuplicates);
 	document.getElementById("export-graduation-dbs").addEventListener("click", exportAllGraduations);
 }
 
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