implemented ClientCLI DB queries

src/cli/ClientCLI/db/client_db.h

@@ -21,10 +21,18 @@ typedef struct SavedServer {
 
 List_declare(SavedServer);
 
+#define SavedServer_construct(ADDR, PK, NAME, DESC) ((SavedServer){ \
+    .address = ADDR, .pk_base64 = PK, .name = NAME, .description = DESC })
+
 void SavedServer_destroy(SavedServer* self);
 
-/// @brief insert new DB row or update existing
-Result(void) SavedServer_save(ClientQueries* q, SavedServer* server);
+/// @return true if new row was created
+Result(bool) SavedServer_createOrUpdate(ClientQueries* q, SavedServer* server);
 
 /// @param dst_list there SavedServer values are pushed
 Result(void) SavedServer_getAll(ClientQueries* q, List(SavedServer)* dst_list);
+
+Result(bool) SavedServer_exists(ClientQueries* q, str address);
+
+/// @return true if provided key and saved key match
+Result(bool) SavedServer_comparePublicKey(ClientQueries* q, str address, str pk_base64);