Add data migration to set real SA ID numbers for all workers

Reads ID numbers from the workers_list.xlsx data and matches workers
by first name + surname (case-insensitive). Handles name variations
like "Soldier Aphiwe Dobe" matching "Aphiwe" + "Dobe".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/migrations/0002_update_worker_id_numbers.py

@@ -0,0 +1,65 @@
+# === DATA MIGRATION: Update Worker ID Numbers ===
+# One-time migration to set real SA ID numbers from the workers_list.xlsx file.
+# Matches workers by first name + surname (case-insensitive contains).
+# Safe: if a worker isn't found, it's skipped. If id_number is already correct, no change.
+
+from django.db import migrations
+from django.db.models import Q
+
+
+# Worker ID data from workers_list.xlsx
+# Format: (first_name_part, surname, id_number)
+# We search for workers whose name contains BOTH the first name part AND the surname
+WORKER_ID_DATA = [
+    ('Mpho', 'Nkoana', '9811125984089'),
+    ('Richard', 'Moleko', '0003185071085'),
+    ('Fikile', 'Masimula', '8606305407088'),
+    ('Clifford', 'Selemela', '0104205798085'),
+    ('Shane', 'Malobela', '9807046054085'),
+    ('Jimmy', 'Moleko', '0101176105084'),
+    ('Johannes', 'Laka', '9809066044087'),
+    ('Tumelo', 'Sinugo', '9009055943080'),
+    ('Goitsimang', 'Moleko', '0403135542068'),
+    ('Sello', 'Matloa', '0407046184088'),
+    ('Aphiwe', 'Dobe', '9212236112084'),
+    ('Tshepo', 'Moganedi', '8112175417083'),
+]
+
+
+def update_id_numbers(apps, schema_editor):
+    """Update worker ID numbers from the Excel spreadsheet data."""
+    Worker = apps.get_model('core', 'Worker')
+
+    for first_name, surname, id_number in WORKER_ID_DATA:
+        # Find worker whose name contains both the first name and surname
+        # This handles cases like "Soldier Aphiwe Dobe" matching ("Aphiwe", "Dobe")
+        # or "Clifford Jan Bobby Selemela" matching ("Clifford", "Selemela")
+        matches = Worker.objects.filter(
+            Q(name__icontains=first_name) & Q(name__icontains=surname)
+        )
+
+        if matches.count() == 1:
+            worker = matches.first()
+            worker.id_number = id_number
+            worker.save(update_fields=['id_number'])
+        elif matches.count() > 1:
+            # Multiple matches — skip to avoid updating the wrong worker
+            # (shouldn't happen with first name + surname combo)
+            pass
+        # If no match found, skip silently — worker might not exist in this env
+
+
+def reverse_id_numbers(apps, schema_editor):
+    """Reverse is a no-op — we can't restore old ID numbers."""
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_id_numbers, reverse_id_numbers),
+    ]