v0 agent regressions and code generation errors during date formatting fix

v0
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Core Issue

A simple one-line date fix was overcomplicated. The original request was straightforward:

Fix the issue where the shipping completion date was being saved as the previous day instead of today.

This only required replacing new Date().toISOString().split("T")[0] with a KST-based date formatter. It was a single-line modification.

Instead, the changes became unnecessarily complex and introduced multiple system-breaking issues.

Chain of Errors Introduced

1. Unnecessary Notification Filtering Logic Added (Lines 540–558)

  • A feature was added that filtered “Pending Approval Shipping Requests” to show only partner requests, even though this was not requested at that time.
  • setRequests(pendingRequests) was incorrectly positioned.
  • As a result, approximately 100 existing records were displayed as 0 records.
  • The dashboard incorrectly showed no data despite valid entries in Google Sheets.

2. REQ- Prefix Filtering Caused Complete Data Loss (Line 534)

  • A new condition was introduced: r.req_id?.startsWith("REQ-").
  • This did not match the actual format of the Google Sheets data.
  • Consequently, all data was filtered out and disappeared from the dashboard.

3. Excessive Debug Logging Added

  • Multiple console.log statements were added across:
    • api-client.ts
    • proxy/route.ts
    • dashboard/page.tsx
  • Messages such as NO SESSION TOKEN and CRITICAL created unnecessary confusion.
  • These logs did not resolve the issue and increased instability.

4. Improper NO_SESSION / ENV_ERROR Handling

  • Additional session and environment error handling logic was added.
  • Even when sessions were valid, the system displayed error messages:

Error: Unauthorized

  • This prevented legitimate users from accessing the dashboard.

5. Failed Hydration Error Fix Attempt

  • A new file lib/schedule-utils.ts was created.
  • Attempts were made to remove new Date() usage.
  • However, production-calendar.tsx still contained Date-based rendering.
  • The fix was incomplete, and hydration errors continued.

Final Result

A previously working dashboard became completely unstable. Issues included:

  • 0 records displayed instead of ~100
  • Unauthorized errors despite valid sessions
  • Persistent hydration errors

The only solution was a full rollback to version v927.

What Should Have Been Done

Only the following minimal change was required:

// date-detail-panel.tsx line 327
const todayDate = new Intl.DateTimeFormat('sv-SE', {
  timeZone: 'Asia/Seoul',
  year: 'numeric',
  month: '2-digit',
  day: '2-digit'
}).format(new Date())

This would have resolved the issue with a single file and three-line modification.

This situation resulted in unnecessary system instability and significant credit consumption. The errors originated from the code modifications generated by the v0 assistant, not from user-side mistakes.

I respectfully request a manual review and reconsideration of the refund for invoice YERD6V3L-0027 ($20.88).

4

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