<h2>Testing Approval Tracking Columns (Task 15.1)</h2>
<pre>

1. Testing: ALTER TABLE invoice_tests ADD COLUMN approved_by INT DEFAULT NULL
--------------------------------------------------------------------------------
   ✓ Column already exists (OK)

2. Testing: ALTER TABLE invoice_tests ADD COLUMN approved_at TIMESTAMP NULL DEFAULT NULL
--------------------------------------------------------------------------------
   ✓ Column already exists (OK)

3. Testing: ALTER TABLE invoice_tests ADD COLUMN result_comments TEXT DEFAULT NULL
--------------------------------------------------------------------------------
   ✓ Column already exists (OK)

================================================================================
VERIFICATION: Checking if columns exist in invoice_tests table
================================================================================

invoice_tests table structure:

   ✓ result_comments - Type: mediumtext | Null: YES | Default: NULL
   ✓ approved_by - Type: int(11) | Null: YES | Default: NULL
   ✓ approved_at - Type: datetime | Null: YES | Default: NULL

================================================================================
SUMMARY
================================================================================

Total queries tested: 3
Successful: 3
Errors: 0
Columns found in table: 3/3

✓✓✓ SUCCESS: All approval tracking columns are properly implemented! ✓✓✓

Task 15.1 is COMPLETE:
  • approved_by INT DEFAULT NULL
  • approved_at TIMESTAMP NULL DEFAULT NULL
  • result_comments TEXT DEFAULT NULL

These columns satisfy Requirements 7.1 and 7.2:
  • Req 7.1: Display 'Approved By' user names in footer
  • Req 7.2: Display approval timestamp when it exists

</pre>