Move database storage to platform-specific directories

[Copilot]

The database was stored in ~/.boost/boost.db across all platforms. This moves it to follow OS conventions for persistent application data.

Changes

• Database path logic (src/server/db.ts):

  • macOS: ~/Library/boost/boost.db
  • Linux: $XDG_DATA_HOME/boost/boost.db, falls back to ~/.local/state/boost/boost.db

• Documentation (README.md): Updated database location references

function getDbPath(): string {
  const home = homedir();
  const plat = platform();
  
  if (plat === 'darwin') {
    return join(home, 'Library', 'boost', 'boost.db');
  } else {
    const xdgDataHome = process.env.XDG_DATA_HOME;
    return xdgDataHome 
      ? join(xdgDataHome, 'boost', 'boost.db')
      : join(home, '.local', 'state', 'boost', 'boost.db');
  }
}

Note: Existing databases at ~/.boost/boost.db will not be migrated automatically.

Original prompt

the storage location of boost.db should be moved to ~/Library/boost/boost.db on mac and $XDG_DATA_HOME/boost/boost.db  or $HOME/.local/state/boost/boost.db if $XDG_DATA_HOME is empty on linux. If that is the best space to save persisted data for mcps

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.