Changelog-Modal: klickbar auf Versionierung, Admin kann Einträge anlegen/löschen

backend/src/db.js

@@ -322,6 +322,19 @@ if (poCols.length && !poCols.includes('retry'))
 if (poCols.length && !poCols.includes('expire'))
   db.exec("ALTER TABLE pushover_settings ADD COLUMN expire INTEGER DEFAULT NULL");
 
+// ── Changelog ─────────────────────────────────────────────────────────────────
+if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='changelog'").get()) {
+  db.exec(`
+    CREATE TABLE changelog (
+      id         INTEGER PRIMARY KEY AUTOINCREMENT,
+      version    TEXT NOT NULL,
+      title      TEXT NOT NULL,
+      body       TEXT NOT NULL DEFAULT '',
+      created_at DATETIME DEFAULT NULL
+    )
+  `);
+}
+
 // ── Push-Zeitplaner ───────────────────────────────────────────────────────────
 if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='push_schedules'").get()) {
   db.exec(`