feat: add AirShelf core implementation

core/backend/apps/common/models.py

@@ -0,0 +1,33 @@
+import uuid
+
+from django.db import models
+
+
+class UUIDModel(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    class Meta:
+        abstract = True
+
+
+class TimeStampedModel(UUIDModel):
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class TeamOwnedModel(TimeStampedModel):
+    team = models.ForeignKey("accounts.Team", on_delete=models.CASCADE, related_name="%(class)s_set")
+    created_by = models.ForeignKey(
+        "accounts.User",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="created_%(class)s_set",
+    )
+
+    class Meta:
+        abstract = True
+