fix: flatten UUID to str for make_json_safe()

src/wuttaweb/util.py

@@ -27,6 +27,7 @@ Web Utilities
 import importlib
 import json
 import logging
+import uuid as _uuid
 import warnings
 
 import sqlalchemy as sa
@@ -531,6 +532,10 @@ def make_json_safe(value, key=None, warn=True):
             parent[key] = make_json_safe(value, key=key, warn=warn)
         value = parent
 
+    # convert UUID to str
+    if isinstance(value, _uuid.UUID):
+        value = value.hex
+
     # ensure JSON-compatibility, warn if problems
     try:
         json.dumps(value)