Changelog: Was ist neu? Button + Unread-Tracking

backend/src/db.js

@@ -342,6 +342,15 @@ const clCols = db.prepare("PRAGMA table_info(changelog)").all().map(r => r.name)
 if (clCols.length && !clCols.includes('build_time'))
   db.exec("ALTER TABLE changelog ADD COLUMN build_time TEXT DEFAULT NULL");
 
+if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='changelog_reads'").get()) {
+  db.exec(`
+    CREATE TABLE changelog_reads (
+      user_id    INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+      last_read  DATETIME DEFAULT NULL
+    )
+  `);
+}
+
 // ── Push-Zeitplaner ───────────────────────────────────────────────────────────
 if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='push_schedules'").get()) {
   db.exec(`