Nexus samples: use business IDs for workflow IDs

hello_nexus/handler/service_handler.py

@@ -33,7 +33,7 @@ async def my_workflow_run_operation(
         return await ctx.start_workflow(
             WorkflowStartedByNexusOperation.run,
             input,
-            id=str(uuid.uuid4()),
+            id=f"hello-nexus-workflow-{input.name}-{uuid.uuid4()}",
         )
 
     # This is a Nexus operation that responds synchronously to all requests. That means

nexus_cancel/handler/service_handler.py

@@ -1,12 +1,15 @@
 """
 Nexus service handler for the cancellation sample.
 
-The hello operation is backed by a workflow, using the Nexus request ID as the
-workflow ID for idempotency across retries.
+The hello operation is backed by a workflow whose ID is derived from the
+operation input (name + language), giving each fan-out branch a distinct,
+meaningful business ID.
 """
 
 from __future__ import annotations
 
+import uuid
+
 import nexusrpc
 from temporalio import nexus
 
@@ -23,5 +26,5 @@ async def hello(
         return await ctx.start_workflow(
             HelloHandlerWorkflow.run,
             input,
-            id=ctx.request_id,
+            id=f"hello-handler-{input.name}-{input.language.name}-{uuid.uuid4()}",
         )

nexus_multiple_args/handler/service_handler.py

@@ -32,7 +32,7 @@ async def hello(
                 input.name,  # First argument: name
                 input.language,  # Second argument: language
             ],
-            id=str(uuid.uuid4()),
+            id=f"hello-multi-args-{input.name}-{input.language}-{uuid.uuid4()}",
         )