implemented server database and api for client database

include/tcp-chat/client.h

@@ -20,12 +20,12 @@ Result(void) Client_connect(Client* client, cstr server_addr_cstr, cstr server_p
 void Client_disconnect(Client* client);
 
 /// @param self connected client
-/// @param out_name owned by Client, fetched from server during Client_connect
-Result(void) Client_getServerName(Client* self, str* out_name);
+/// @param out_str heap-allocated string
+Result(void) Client_getServerName(Client* self, str* out_str);
 
 /// @param self connected client
-/// @param out_name owned by Client, fetched from server during Client_connect
-Result(void) Client_getServerDescription(Client* self, str* out_desc);
+/// @param out_str heap-allocated string
+Result(void) Client_getServerDescription(Client* self, str* out_str);
 
 /// Create new account on connected server
 Result(void) Client_register(Client* self, i64* out_user_id);

include/tcp-chat/tcp-chat.h

@@ -12,3 +12,5 @@ typedef enum TcpChatError {
     TcpChatError_Unknown,
     TcpChatError_RejectIncoming,
 } TcpChatError;
+
+#define MESSAGE_TIMESTAMP_FMT_SQL "%Y.%m.%d-%H:%M:%f"