Lossless-memory is a personal AI memory system that stores complete conversation logs with timestamps instead of summarizing them. It uses a time-based search approach combined with exact-match and semantic indexing, allowing users to retrieve specific conversations by date and content. The system has run daily since July 2026 for a single user on a local machine.
OpenBSD's doas and sudo use timestamp files to avoid repeated password entry. A security vulnerability allowed timestamp file reuse on Linux by matching PPID and TTY, which was fixed by including the session leader's start time in the timestamp mechanism, implemented in both doas and sudo 1.8.22.