Relational messaging database schema for one-to-one and group chat apps with attachments and MySQL Workbench model.
3 files for GitHub Copilot, Codex, OpenCode and Claude Code: Messenger copilot-instructions.md, Messenger AGENTS.md, Messenger CLAUDE.md — 805 tokens loaded in every session.
.github/copilot-instructions.md A 140 tok AGENTS.md A 389 tok CLAUDE.md A 276 tok These files are yoosuf/Messenger's own configuration — they tell GitHub Copilot, Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.