feat: Add new id and created_at claim fields

models/claim.py

@@ -1,11 +1,22 @@
-from pydantic import BaseModel
-from typing import Optional
+from datetime import datetime
+from pydantic import BaseModel, Field
 from typing import Optional, Set
+import random
+import string
 
 
 class ClaimModel(BaseModel):
-    additional_documentation: Optional[str] = None
-    claim_explanation: Optional[str] = None
+    # Immutable fields
+    id: str = Field(
+        default_factory=(
+            lambda: "".join(
+                random.choice(string.ascii_lowercase + string.digits) for _ in range(6)
+            )
+        ),
+        frozen=True,
+    )
+    created_at: datetime = Field(default_factory=datetime.utcnow, frozen=True)
+    # Editable fields
     extra_details: Optional[str] = None
     incident_date_time: Optional[str] = None
     incident_description: Optional[str] = None
@@ -27,4 +38,7 @@ class ClaimModel(BaseModel):
 
     @staticmethod
     def editable_fields() -> Set[str]:
-        return ClaimModel.model_json_schema()["properties"].keys()
+        return ClaimModel.model_json_schema()["properties"].keys() - [
+            "id",
+            "created_at",
+        ]