Issue #604/#644 explicitly use default value from schema as fallback

improves long term traceability and observability

openeo/extra/job_management.py

@@ -895,7 +895,7 @@ def create_job_db(path: Union[str, Path], df: pd.DataFrame, *, on_exists: str =
 class UDPJobFactory:
     """
     Batch job factory based on a parameterized process definition
-    (e.g a user-defined process (UDP) or a remote process definitions),
+    (e.g a user-defined process (UDP) or a remote process definition),
     to be used together with :py:class:`MultiBackendJobManager`.
     """
 
@@ -946,9 +946,13 @@ def start_job(self, row: pd.Series, connection: Connection, **_) -> BatchJob:
             elif name in self._parameter_defaults:
                 # Fallback on default values from constructor
                 value = self._parameter_defaults[name]
+            elif parameter.has_default():
+                # Explicitly use default value from parameter schema
+                value = parameter.default
+            elif parameter.optional:
+                # Skip optional parameters without any fallback default value
+                continue
             else:
-                if parameter.optional:
-                    continue
                 raise ValueError(f"Missing required parameter {name!r} for process {self._process_id!r}")
 
             # TODO: validation or normalization based on schema?

tests/extra/test_job_management.py

@@ -1041,7 +1041,7 @@ def test_basic(self, con120, dummy_backend):
                     "increment1": {
                         "process_id": "increment",
                         "namespace": "https://remote.test/increment.json",
-                        "arguments": {"data": 123},
+                        "arguments": {"data": 123, "increment": 1},
                         "result": True,
                     }
                 },
@@ -1052,7 +1052,7 @@ def test_basic(self, con120, dummy_backend):
     @pytest.mark.parametrize(
         ["parameter_defaults", "row", "expected_arguments"],
         [
-            (None, {"data": 123}, {"data": 123}),
+            (None, {"data": 123}, {"data": 123, "increment": 1}),
             (None, {"data": 123, "increment": 5}, {"data": 123, "increment": 5}),
             ({"increment": 5}, {"data": 123}, {"data": 123, "increment": 5}),
             ({"increment": 5}, {"data": 123, "increment": 1000}, {"data": 123, "increment": 1000}),