add update settings method, remove all env var references possible

Server/db/mongo/modules/settingsModule.js

@@ -12,6 +12,22 @@ const getAppSettings = async () => {
   }
 };
 
+const updateAppSettings = async (newSettings) => {
+  try {
+    const settings = await AppSettings.findOneAndUpdate(
+      {},
+      { $set: newSettings },
+      { new: true }
+    );
+    return settings;
+  } catch (error) {
+    error.service = SERVICE_NAME;
+    error.method = "updateAppSettings";
+    throw error;
+  }
+};
+
 module.exports = {
   getAppSettings,
+  updateAppSettings,
 };