update default key regex

.env

@@ -104,7 +104,7 @@ APP_ADD_POST_REMOTE_IP_DENIED=
 
 # Post ID rules (for kevacoin key)
 # do not change to keep external KevaChat nodes compatibility
-APP_ADD_POST_KEY_REGEX=/^([\d]{1,260})@([A-z0-9-_]{1,260})$/
+APP_ADD_POST_KEY_REGEX=/^([\d]{1,64})@([A-z0-9-_]{1,64})$/
 
 # Post content rules (for kevacoin value, max length is 3072)
 # do not change to keep external KevaChat nodes compatibility