diff --git a/src/server/mysql.h b/src/server/mysql.h
--- a/src/server/mysql.h
+++ b/src/server/mysql.h
@@ -45,9 +45,14 @@ int mysqlConnect(distrend_mysql_conn_t *
 int mysqlDisconnect(distrend_mysql_conn_t conn);
 
 /**
-   Mark a frame as finished in the database.
+   Mark a frame as finished in the database and calculate the seconds spent on that frame.
  */
-void finish_frame(distrend_mysql_conn_t conn, int32_t jobkey, int32_t framenum);
+void finish_frame(distrend_mysql_conn_t conn, int32_t slavekey, int32_t jobkey, int32_t framenum);
+
+/**
+   Mark a frame as started in the database and save the time at which it started.
+ */
+int start_frame(distrend_mysql_conn_t conn, int32_t slavekey, int32_t jobkey, int32_t framenum);
 
 /**
    Changes the priority of an existing (and maybe running) job. @arg head I may end up changing the head if job == head