Eli Greenfeld developed a security-focused feature for the get-convex/convex-helpers repository, enhancing backend data protection through improved row-level access control. He introduced a configurable RLSConfig object within the rowLevelSecurity module, establishing a default-deny policy that centralizes and enforces explicit per-table access rules. This approach, implemented using TypeScript and leveraging his expertise in access control and database security, reduces the risk of unintended data exposure and streamlines compliance alignment. The work was delivered as a focused, single-feature update with minimal surface area, enabling easier policy updates and clearer auditability for teams managing sensitive data in Convex environments.