# EPF6 Dev Updates – Week 9 Back to work after a short break. Completed exalidraw of prysm backfill architecture https://excalidraw.com/#json=l3JXNuP1HrEu7XkOG96ZX,PToyNL-aPpq0Vrg4wUVUtg ![prysm_backfill_arch.excalidraw](https://hackmd.io/_uploads/HkQPlSy9lx.svg) ![Untitled-2025-08-29-2031(3)](https://hackmd.io/_uploads/S1BVrHycxe.svg) Drafted pr for my project proposal: https://github.com/eth-protocol-fellows/cohort-six/pull/305 Apart from this I'm getting more interested into details of prysm's bolt db. The way db's ACID properties are carefully maintained. Prysm's unique way of passing functions that change db state in txns rather than directly applying logic. This particular usage is very new to me and it seems quite useful for we get more control over things in this way. Week 10 goals: --- - Finalize project proposal and get it merged - Resolve issues in current pr: https://github.com/ChainSafe/lodestar/pull/8085 - Start working on other subtasks: starting with Roughing out primary backfill class and make it compatible to run in worker threads. - Research more on communication between threads and peer management