perf(db): add targeted composite indexes

apps/time_entries/migrations/0002_timeentry_time_entry_ws_user_start_idx.py

@@ -0,0 +1,22 @@
+# Generated by Django 5.2.12 on 2026-04-30 12:23
+
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('projects', '0003_project_project_ws_arch_upd_idx'),
+        ('tags', '0001_initial'),
+        ('time_entries', '0001_initial'),
+        ('workspaces', '0007_workspacemembership_membership_ws_active_user_idx'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='timeentry',
+            index=models.Index(fields=['workspace', 'user', 'start_time'], name='time_entry_ws_user_start_idx'),
+        ),
+    ]