feat: added core app

solution/services/backend/apps/core/apps.py

@@ -0,0 +1,13 @@
+import contextlib
+
+from django.apps import AppConfig
+from django.core.cache import cache
+
+
+class CoreConfig(AppConfig):
+    name = "apps.core"
+    label = "core"
+
+    def ready(self) -> None:
+        with contextlib.suppress(Exception):
+            cache.add("current_date", 0, timeout=None)

solution/services/backend/apps/core/models.py

@@ -0,0 +1,48 @@
+import uuid
+from typing import Any
+
+from django.core.exceptions import ValidationError
+from django.db import models
+
+from config.errors import ConflictError
+
+
+class BaseModel(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    class Meta:
+        abstract = True
+
+    def save(self, *args: Any, **kwargs: Any) -> None:
+        self.validate()
+
+        super().save(*args, **kwargs)
+
+    def validate(
+        self,
+        validate_unique: bool = True,
+        validate_constraints: bool = True,
+        include: list[models.Field] | None = None,
+    ) -> None:
+        self.full_clean(
+            validate_unique=False,
+            validate_constraints=False,
+            exclude=(
+                field.name
+                for field in set(self._meta.get_fields()) - set(include)
+            )
+            if include
+            else None,
+        )
+
+        if validate_unique:
+            try:
+                self.validate_unique()
+            except ValidationError as e:
+                raise ConflictError(e) from None
+
+        if validate_constraints:
+            try:
+                self.validate_constraints()
+            except ValidationError as e:
+                raise ConflictError(e) from None