Legacy architecture. Simple LRT is an earlier generation of Mellow vault infrastructure, documented for existing deployments. Core Vaults are Mellow’s current vault architecture.
Simple LRT
Overview
The system is comprised of a set of contracts, with the main one being the vault contract (MellowSymbioticVault / MellowVaultCompat). This vault is a modification of the ERC4626 standard, featuring queued withdrawals. To handle these queued withdrawals, there is a separate contract called the SymbioticWithdrawalQueue. The code has multiple audits and is available here: https://github.com/mellow-finance/simple-lrt.