There should be a configurable limit to the size of the image cache directory, and if new images cause it to exceed that size, the least recently accessed (or least recently modified, since we currently periodically refresh cached images) files should be purged first.
There should be a configurable limit to the size of the image cache directory, and if new images cause it to exceed that size, the least recently accessed (or least recently modified, since we currently periodically refresh cached images) files should be purged first.