snapshot: modularize workflow model layer by responsibility

backend/workflows/model_ops.py

@@ -0,0 +1,49 @@
+from django.conf import settings
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class AsyncTaskLog(models.Model):
+    STATUS_CHOICES = [
+        ('started', _('Gestartet')),
+        ('succeeded', _('Erfolgreich')),
+        ('failed', _('Fehlgeschlagen')),
+    ]
+
+    task_name = models.CharField(max_length=255)
+    task_id = models.CharField(max_length=255, blank=True)
+    target_type = models.CharField(max_length=80, blank=True)
+    target_id = models.PositiveIntegerField(null=True, blank=True)
+    target_label = models.CharField(max_length=255, blank=True)
+    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='started')
+    error_message = models.TextField(blank=True)
+    started_at = models.DateTimeField(auto_now_add=True)
+    finished_at = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        ordering = ['-started_at', '-id']
+        verbose_name = 'Async Task Log'
+        verbose_name_plural = 'Async Task Logs'
+
+    def __str__(self) -> str:
+        return f'{self.task_name} | {self.status} | {self.target_label or self.target_type}'
+
+
+class AdminAuditLog(models.Model):
+    actor = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True, on_delete=models.SET_NULL, related_name='admin_audit_logs')
+    actor_display = models.CharField(max_length=255, blank=True)
+    action = models.CharField(max_length=120)
+    target_type = models.CharField(max_length=80, blank=True)
+    target_id = models.PositiveIntegerField(null=True, blank=True)
+    target_label = models.CharField(max_length=255, blank=True)
+    details = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ['-created_at', '-id']
+        verbose_name = 'Admin Audit Log'
+        verbose_name_plural = 'Admin Audit Logs'
+
+    def __str__(self) -> str:
+        actor = self.actor_display or 'Unbekannt'
+        return f'{self.created_at:%Y-%m-%d %H:%M} | {actor} | {self.action}'