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evansenter merged 1 commit into from
Jan 1, 2026
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docs: Add database protection warning to CLAUDE.md #31

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22 changes: 22 additions & 0 deletions CLAUDE.md
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Expand Up @@ -27,6 +27,28 @@ Key components:
- **Auto-refresh** queries automatically refresh stale data (>5 min old)
- **LaunchAgent** for always-on availability (macOS)

---

## ⚠️ DATABASE PROTECTION - READ THIS ⚠️

**The database at `~/.claude/contrib/analytics/data.db` contains irreplaceable historical data.**

### NEVER do any of the following:
- Add code that deletes the database file (`os.remove()`, `unlink()`, `rm`)
- Add `DROP TABLE` statements for `events`, `sessions`, `ingested_files`, or `git_commits`
- Add `DELETE FROM` for user data tables (only `patterns` table can be cleared - it's re-computed)
- Add any "reset" or "clear all" functionality that destroys historical data

### Safe operations:
- `DELETE FROM patterns` - OK, patterns are re-computed derived data
- `make uninstall` - OK, preserves database (only removes LaunchAgent + MCP config)
- `make reinstall` - OK, just reinstalls Python package

### If you need to test destructive operations:
Use a temporary database in tests (all tests already do this via `tmpdir`).

---

## Commands

```bash
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