Update

backend/db/settings.js

@@ -0,0 +1,71 @@
+import { db } from './index.js';
+
+const CREATE_TABLE_SQL = `
+  CREATE TABLE IF NOT EXISTS settings (
+    key TEXT PRIMARY KEY,
+    value TEXT,
+    updated_at TEXT DEFAULT CURRENT_TIMESTAMP
+  )
+`;
+
+db.prepare(CREATE_TABLE_SQL).run();
+
+const getSettingStmt = db.prepare('SELECT key, value, updated_at FROM settings WHERE key = ?');
+const setSettingStmt = db.prepare(`
+  INSERT INTO settings (key, value, updated_at)
+  VALUES (@key, @value, CURRENT_TIMESTAMP)
+  ON CONFLICT(key) DO UPDATE SET
+    value = excluded.value,
+    updated_at = CURRENT_TIMESTAMP
+`);
+const deleteSettingStmt = db.prepare('DELETE FROM settings WHERE key = ?');
+
+export function getSetting(key) {
+  try {
+    return getSettingStmt.get(key) || null;
+  } catch (err) {
+    console.error(`❌ [Settings] Fehler beim Lesen des Settings "${key}":`, err.message);
+    return null;
+  }
+}
+
+export function setSetting(key, value) {
+  try {
+    setSettingStmt.run({ key, value });
+    return true;
+  } catch (err) {
+    console.error(`❌ [Settings] Fehler beim Speichern des Settings "${key}":`, err.message);
+    return false;
+  }
+}
+
+export function deleteSetting(key) {
+  try {
+    deleteSettingStmt.run(key);
+    return true;
+  } catch (err) {
+    console.error(`❌ [Settings] Fehler beim Löschen des Settings "${key}":`, err.message);
+    return false;
+  }
+}
+
+export function getJsonSetting(key, defaultValue = null) {
+  const row = getSetting(key);
+  if (!row || row.value === null || row.value === undefined) return defaultValue;
+  try {
+    return JSON.parse(row.value);
+  } catch (err) {
+    console.warn(`⚠️ [Settings] Konnte JSON für Setting "${key}" nicht parsen:`, err.message);
+    return defaultValue;
+  }
+}
+
+export function setJsonSetting(key, value) {
+  try {
+    const payload = value === undefined ? null : JSON.stringify(value);
+    return setSetting(key, payload);
+  } catch (err) {
+    console.error(`❌ [Settings] Fehler beim Serialisieren von Setting "${key}":`, err.message);
+    return false;
+  }
+}

backend/maintenance/state.js

@@ -0,0 +1,63 @@
+import { getJsonSetting, setJsonSetting } from '../db/settings.js';
+
+const MAINTENANCE_KEY = 'maintenance_mode';
+
+const DEFAULT_STATE = {
+  active: false,
+  message: null,
+  activatedAt: null,
+  updatedAt: null,
+  extra: null
+};
+
+let maintenanceState = loadState();
+
+function loadState() {
+  const saved = getJsonSetting(MAINTENANCE_KEY, null);
+  if (!saved) {
+    const initial = { ...DEFAULT_STATE, updatedAt: new Date().toISOString() };
+    setJsonSetting(MAINTENANCE_KEY, initial);
+    return initial;
+  }
+  return {
+    ...DEFAULT_STATE,
+    ...saved
+  };
+}
+
+function persistState(state) {
+  maintenanceState = {
+    ...DEFAULT_STATE,
+    ...state,
+    updatedAt: new Date().toISOString()
+  };
+  setJsonSetting(MAINTENANCE_KEY, maintenanceState);
+  return maintenanceState;
+}
+
+export function getMaintenanceState() {
+  return { ...maintenanceState };
+}
+
+export function isMaintenanceModeActive() {
+  return Boolean(maintenanceState?.active);
+}
+
+export function activateMaintenanceMode({ message = null, extra = null } = {}) {
+  const now = new Date().toISOString();
+  return persistState({
+    active: true,
+    message,
+    extra,
+    activatedAt: now
+  });
+}
+
+export function deactivateMaintenanceMode({ message = null } = {}) {
+  return persistState({
+    active: false,
+    message,
+    extra: null,
+    activatedAt: null
+  });
+}