Add `USET` to actions doc

actions.jsonc

@@ -117,7 +117,7 @@
         "since": "0.4.3",
         "complexity": "O(1)",
         "args": "DBSIZE",
-        "desc": "Returns the number of key/value pairs stored in the database",
+        "desc": "Number of key/value pairs stored in the database",
         "return": "Number of keys that exist in the database as an unsigned int"
     },
     {
@@ -127,5 +127,13 @@
         "args": "FLUSHDB",
         "desc": "Removes all the key/value pairs stored in the database",
         "return": "(Code: 0) if the operation succeeded"
+    },
+    {
+        "name": "USET",
+        "since": "0.4.4",
+        "complexity": "O(n)",
+        "args": "USET <key1> <value1> <key2> <value2> ...",
+        "desc": "SET all keys if they don't exist, or UPDATE them if they do exist",
+        "return": "Number of keys that were `USET`ed, as an integer"
     }
 ]

server/src/kvengine/dbsize.rs

@@ -18,6 +18,8 @@
  * along with this program. If not, see <https://www.gnu.org/licenses/>.
  *
 */
+// HACK(@ohsayan): `len` needs to be set to zero, but clippy doesn't like it,so we'll do this
+#![allow(unused_assignments)]
 
 use crate::coredb::CoreDB;
 use crate::protocol::{responses, ActionGroup, Connection};