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  FINAL FIX: Database Collation Issue
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ERROR #2:
Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and 
(utf8mb4_general_ci,IMPLICIT) for operation '='

LOCATION: Line 66 (JOIN statement)

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WHAT THIS MEANS:
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Your database tables have different character set collations:
- tenant_files.tenant_id     = utf8mb4_unicode_ci
- academy_references.reference_code = utf8mb4_general_ci

When joining these columns, MySQL requires they use the same collation.

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THE FIX:
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Added COLLATE clause to force both sides to use the same collation:

BEFORE (BROKEN):
----------------
LEFT JOIN academy_references ar 
    ON tf.tenant_id = ar.reference_code

AFTER (FIXED):
--------------
LEFT JOIN academy_references ar 
    ON tf.tenant_id COLLATE utf8mb4_general_ci = 
       ar.reference_code COLLATE utf8mb4_general_ci

This makes both sides of the comparison use utf8mb4_general_ci.

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UPLOAD THE FIXED FILE (LAST TIME!)
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1. OPEN cPANEL FILE MANAGER

2. NAVIGATE TO:
   public_html/test.melanegroup.com/Multi-Tanent/super_admin/storage/

3. DELETE OLD FILE:
   - Select: overview.php
   - Click Delete
   - Confirm

4. UPLOAD NEW FILE:
   - Click Upload
   - Select: C:\xampp\htdocs\Multi-Tanent\super_admin\storage\overview.php
   - Wait for complete

5. TEST:
   https://test.melanegroup.com/Multi-Tanent/super_admin/storage/overview.php

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PROGRESS SO FAR:
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✓ Fixed 404 error (files uploaded)
✓ Fixed table name (tenants → academy_references)  
✓ Fixed collation mismatch (added COLLATE clause)

Next: Should work completely!

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SUMMARY OF ALL FIXES IN LATEST FILE:
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1. Authentication: Uses requireAdminLogin() and isSuperAdmin()
2. Database: Uses getDB() function
3. Table name: Uses academy_references instead of tenants
4. Column names: Uses reference_code and academy_name
5. Collation: Added COLLATE utf8mb4_general_ci to JOIN
6. Active filter: Added WHERE is_active = 1

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EXPECTED RESULT:
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After uploading this fixed file:

✓ Super Admin Storage dashboard loads
✓ Shows all active schools
✓ Displays storage usage
✓ Charts render correctly
✓ Top 10 files list works
✓ No errors!

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FILE READY: C:\xampp\htdocs\Multi-Tanent\super_admin\storage\overview.php

Windows Explorer should be open showing the file!

Just upload it one more time and you're done! 🎉

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