Add database indexes and minor performance fixes

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

core/admin.py

@@ -18,7 +18,9 @@ class UserAdmin(BaseUserAdmin):
     list_display = ('username', 'first_name', 'last_name', 'is_staff', 'get_groups')
     list_filter = ('is_staff', 'is_superuser', 'is_active', 'groups')
 
-    # Reorder fieldsets so Groups appears near the top
+    def get_queryset(self, request):
+        return super().get_queryset(request).prefetch_related('groups')
+
     fieldsets = (
         (None, {'fields': ('username', 'password')}),
         ('Personal info', {'fields': ('first_name', 'last_name', 'email')}),
@@ -63,6 +65,9 @@ class ProjectAdmin(admin.ModelAdmin):
     list_filter = ('is_active',)
     filter_horizontal = ('supervisors',)
 
+    def get_queryset(self, request):
+        return super().get_queryset(request).prefetch_related('supervisors')
+
     def get_supervisors(self, obj):
         return ', '.join(u.username for u in obj.supervisors.all()) or '-'
     get_supervisors.short_description = 'Supervisors'

core/context_processors.py

@@ -1,6 +1,9 @@
 import os
 import time
 
+# Computed once at module load — changes per server restart/deploy
+_DEPLOYMENT_TIMESTAMP = int(time.time())
+
 
 # === TEMPLATE CONTEXT PROCESSORS ===
 
@@ -11,6 +14,5 @@ def project_context(request):
     return {
         "project_description": os.getenv("PROJECT_DESCRIPTION", ""),
         "project_image_url": os.getenv("PROJECT_IMAGE_URL", ""),
-        # Used for cache-busting static assets
-        "deployment_timestamp": int(time.time()),
+        "deployment_timestamp": _DEPLOYMENT_TIMESTAMP,
     }

core/migrations/0017_alter_payrolladjustment_date_and_more.py

@@ -0,0 +1,34 @@
+# Generated by Django 5.2.7 on 2026-02-19 22:25
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0016_alter_payrolladjustment_type'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='payrolladjustment',
+            name='date',
+            field=models.DateField(db_index=True, default=django.utils.timezone.now),
+        ),
+        migrations.AlterField(
+            model_name='payrolladjustment',
+            name='type',
+            field=models.CharField(choices=[('BONUS', 'Bonus'), ('OVERTIME', 'Overtime'), ('DEDUCTION', 'Deduction'), ('LOAN_REPAYMENT', 'Loan Repayment'), ('LOAN', 'New Loan'), ('ADVANCE', 'Advance Payment')], db_index=True, default='DEDUCTION', max_length=20),
+        ),
+        migrations.AlterField(
+            model_name='payrollrecord',
+            name='date',
+            field=models.DateField(db_index=True, default=django.utils.timezone.now),
+        ),
+        migrations.AlterField(
+            model_name='worklog',
+            name='date',
+            field=models.DateField(db_index=True),
+        ),
+    ]

core/models.py

@@ -95,7 +95,7 @@ class WorkLog(models.Model):
         (Decimal('1.0'), 'Full Day'),
     ]
 
-    date = models.DateField()
+    date = models.DateField(db_index=True)
     project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='logs')
     team = models.ForeignKey(Team, on_delete=models.SET_NULL, null=True, blank=True, related_name='work_logs')
     workers = models.ManyToManyField(Worker, related_name='work_logs')
@@ -117,7 +117,7 @@ class WorkLog(models.Model):
 
 class PayrollRecord(models.Model):
     worker = models.ForeignKey(Worker, on_delete=models.CASCADE, related_name='payroll_records')
-    date = models.DateField(default=timezone.now)
+    date = models.DateField(default=timezone.now, db_index=True)
     amount = models.DecimalField(max_digits=10, decimal_places=2)
     work_logs = models.ManyToManyField(WorkLog, related_name='paid_in')
     created_at = models.DateTimeField(auto_now_add=True)
@@ -171,9 +171,9 @@ class PayrollAdjustment(models.Model):
     work_log = models.ForeignKey(WorkLog, on_delete=models.SET_NULL, null=True, blank=True, related_name='adjustments')
 
     amount = models.DecimalField(max_digits=10, decimal_places=2, help_text="Positive adds to pay, negative subtracts (except for Loan Repayment which is auto-handled)")
-    date = models.DateField(default=timezone.now)
+    date = models.DateField(default=timezone.now, db_index=True)
     description = models.CharField(max_length=255)
-    type = models.CharField(max_length=20, choices=ADJUSTMENT_TYPES, default='DEDUCTION')
+    type = models.CharField(max_length=20, choices=ADJUSTMENT_TYPES, default='DEDUCTION', db_index=True)
 
     class Meta:
         verbose_name = "Payroll Adjustment"