More aggressive image caching

api/images.js

@@ -5,6 +5,8 @@ const ensureAdmin = require('./middleware/ensureAdmin')
 router.get('/:uuid/:size', async (req, res) => {
   const image = await db.item.getImage(req.params.uuid, req.params.size)
 
+  const cacheSeconds = 60 * 60 * 24;
+  res.set('Cache-Control', cacheSeconds);
   res.set('Content-Type', image.mime_type)
   res.end(image.file)
 })