![[assets/wl_activity_walsummarizerwal.png|256]] # WalSummarizerWal (The Receipt Reader) The **Receipt Reader** is meticulously scanning the **[[Chapter 6/6.2.2 - The Pocket Diary (WAL IO)|WAL]]** (the Cafe's receipt log) to build a summary of what happened. Instead of reading every single tiny transaction when doing a backup or recovery, we look at the **Summary** to move faster. This worker is currently waiting for new ink to dry on the log so it can keep reading.