__fresh__ key deletion added

redis_cache/backends/base.py

@@ -284,10 +284,14 @@ class BaseRedisCache(BaseCache):
     @get_client(write=True)
     def delete(self, client, key):
         """Remove a key from the cache."""
+        client.delete("__fresh__" + key)
         return client.delete(key)
 
     def _delete_many(self, client, keys):
-        return client.delete(*keys)
+        all_keys = keys.copy()
+        for key in keys:
+            all_keys.append("__fresh__" + key)
+        return client.delete(*all_keys)
 
     def delete_many(self, keys, version=None):
         """
@@ -360,8 +364,12 @@ class BaseRedisCache(BaseCache):
         """
 
     @get_client(write=True)
-    def touch(self, client, key, timeout=DEFAULT_TIMEOUT):
+    def touch(self, client, key, timeout=DEFAULT_TIMEOUT, stale_cache_timeout=None):
         """Reset the timeout of a key to `timeout` seconds."""
+        key_timeout = (
+            None if stale_cache_timeout is None else timeout + stale_cache_timeout
+        )
+        client.expire("__fresh__" + key, key_timeout)
         return client.expire(key, timeout)
 
     #####################