Initial commit: WrestleDesk full project

- Django backend with DRF (clubs, wrestlers, trainers, exercises, templates, trainings, homework, locations, leistungstest)
- Next.js 16 frontend with React, Shadcn UI, Tailwind
- JWT authentication
- Full CRUD for all entities
- Calendar view for trainings
- Homework management system
- Leistungstest tracking

backend/trainers/models.py

@@ -0,0 +1,29 @@
+from django.db import models
+from django.core.validators import FileExtensionValidator
+
+
+class Trainer(models.Model):
+    first_name = models.CharField(max_length=100)
+    last_name = models.CharField(max_length=100)
+    club = models.ForeignKey('clubs.Club', on_delete=models.CASCADE, related_name='trainers')
+    email = models.EmailField(blank=True)
+    phone = models.CharField(max_length=50, blank=True)
+    photo = models.ImageField(
+        upload_to='trainers/photos/',
+        null=True, blank=True,
+        validators=[FileExtensionValidator(allowed_extensions=['jpg', 'jpeg', 'png', 'webp'])]
+    )
+    is_active = models.BooleanField(default=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ['last_name', 'first_name']
+
+    def __str__(self):
+        return f"{self.first_name} {self.last_name}"
+
+
+# Note: Name uniqueness per club is not enforced at the database level.
+# If the same trainer works for multiple clubs, they would appear once per club.
+# If unique names per club are required, add: unique_together = ['first_name', 'last_name', 'club']