Changelog: build_time fix im Eintrag gespeichert statt dynamisch

backend/src/db.js

@@ -332,10 +332,15 @@ if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='cha
       version    TEXT NOT NULL,
       title      TEXT NOT NULL,
       body       TEXT NOT NULL DEFAULT '',
+      build_time TEXT DEFAULT NULL,
       created_at DATETIME DEFAULT NULL
     )
   `);
 }
+// Migration: build_time Spalte
+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");
 
 // ── Push-Zeitplaner ───────────────────────────────────────────────────────────
 if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='push_schedules'").get()) {