fix: resolve UUID JSON serialization error in checkpoint creation

Issue:
- Object of type <class 'uuid.UUID'> is not JSON serializable error when creating checkpoints
- UUID objects in database records couldn't be serialized to JSON

Solution:
- Updated json_serializer function in create_checkpoint() to properly handle UUID types
- Added explicit isinstance check for uuid.UUID before checking for isoformat
- Ensures all UUID values are converted to strings before JSON serialization

This ensures checkpoints can be created successfully with all database data types.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

data/checkpoints/checkpoint_20251030_115009.json

@@ -0,0 +1,8 @@
+{
+  "checkpoint_id": "checkpoint_20251030_115009",
+  "timestamp": "20251030_115009",
+  "description": "1",
+  "tables": {
+    "business_scopes": [
+      {
+        "id": 

lawrisk/services/licensing_repo.py

@@ -438,7 +438,14 @@ def create_checkpoint(description: str = "") -> Dict[str, Any]:
 
     def json_serializer(obj):
         """Convert non-JSON serializable objects to strings."""
-        if hasattr(obj, 'isoformat'):  # UUID, datetime, etc.
+        try:
+            import uuid
+            if isinstance(obj, uuid.UUID):
+                return str(obj)
+        except ImportError:
+            pass
+
+        if hasattr(obj, 'isoformat'):
             return str(obj)
         raise TypeError(f"Object of type {type(obj)} is not JSON serializable")