proto: encode uuid as string

sqld/proto/proxy.proto

@@ -4,7 +4,7 @@ package proxy;
 message Queries {
     repeated Query queries = 1;
     // Uuid
-    bytes clientId = 2;
+    string clientId = 2;
 }
 
 message Query {

sqld/src/database/write_proxy/mod.rs

@@ -154,7 +154,7 @@ impl Database for WriteProxyDatabase {
                         })
                     })
                     .collect::<Result<Vec<_>>>()?,
-                client_id: self.client_id.as_bytes().to_vec(),
+                client_id: self.client_id.to_string(),
             };
             let mut client = self.write_proxy.clone();
             match client.execute(queries).await {

sqld/src/rpc/proxy.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::str::FromStr;
 
 use async_lock::{RwLock, RwLockUpgradableReadGuard};
 use uuid::Uuid;
@@ -167,7 +168,7 @@ where
         req: tonic::Request<Queries>,
     ) -> Result<tonic::Response<ExecuteResults>, tonic::Status> {
         let Queries { client_id, queries } = req.into_inner();
-        let client_id = Uuid::from_slice(&client_id).unwrap();
+        let client_id = Uuid::from_str(&client_id).unwrap();
 
         let lock = self.clients.upgradable_read().await;
         let db = match lock.get(&client_id) {