=== Fixing Empty String Values ===

Converting empty strings to NULL for advance_paid...
  ✓ Updated 0 records

Converting empty strings to NULL for registration_number...
  ✓ Updated 0 records

Verification - Current data state:
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ID    | Name                      | Advance Paid    | Reg Number      | Workflow    
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145   | Workflow Test Customer    | 500.00000000    | REG-2024-001    | REGISTERED  
146   | Workflow Test Customer    | 500.00000000    | REG-2024-001    | REGISTERED  

=== FIX COMPLETE ===

Now test the workflow:
1. Access: http://localhost/admin_crm/htdocs/societe/list.php?contextpage=enquiry
   → Should show only ENQUIRY customers
2. Access: http://localhost/admin_crm/htdocs/societe/list.php?contextpage=booked_customers
   → Should show only BOOKED customers
3. Access: http://localhost/admin_crm/htdocs/societe/list.php?contextpage=registered_customers
   → Should show only REGISTERED customers