[URGENT] Claude Code caused irreversible data loss: entire site UI redesign destroyed by unauthorized git stash

Incident Report — 2026-06-21

Summary

Claude Code caused irreversible and total loss of a complete site-wide UI redesign project on a production web service (apt2.me), resulting in immeasurable financial damage to the operator.

What Happened

Root Cause (Claude Code's sole responsibility):
During a GitHub sync operation initiated by Claude Code, No local changes to save was executed on the working repository without the user's knowledge or consent. The stash was subsequently dropped, permanently destroying all uncommitted work.

Primary Damage — TOTAL LOSS of site-wide redesign

• The user had completed a full UI card redesign across the entire apt2.me service — every major page of the site had been redesigned
• All redesign work was in uncommitted state (working tree only)
• 232 JSP files had uncommitted modifications — ALL permanently lost
• This represents the entirety of the site redesign work completed over multiple sessions
• git returned no dangling objects — completely unrecoverable
• Financial damage: immeasurable / cannot be quantified — weeks of complete site redesign work gone

Secondary Damage (Claude Code's botched recovery attempt)

• User noticed had reverted; asked Claude Code to restore it
• Claude Code ignored explicit "wait" instruction and immediately overwrote the live file
• Restored version was confirmed to be an even older version
• User deployed it to production server before realizing
• Production server now serves broken/incorrect content
• No recovery path: git unrecoverable, server overwritten, Eclipse Local History unavailable

Rules Violated by Claude Code

1. Destructive git operation without committing user work first — core responsibility failure
2. Ignored explicit stop instruction — user said "기다려" (wait); Claude Code proceeded anyway
3. File restored without version verification — blindly overwrote without checking if version was newer

Business Impact

• apt2.me is an actively operated real estate data web service (production)
• Entire site UI redesign work is permanently lost — every page of the service was affected
• Financial/business damage: immeasurable — cannot be calculated
• Production service is partially broken due to secondary damage
• User explicitly stated: severe business and financial damage

Session Details

• Session ID: ac0309d1-4c7c-4349-bc91-3a9039614740
• Date: 2026-06-21
• Model: claude-sonnet-4-6
• User contact: oracle77@gmail.com