refactor: simplify simulation validation logic and update non-default duration requirements

src/calculation_target_reliability/router.py

@@ -92,38 +92,37 @@ async def get_target_reliability(
     #     oh_duration=duration
     # )
     
-    if duration != 17520:
-        if not simulation_id:
-            raise HTTPException(
-                    status_code=status.HTTP_400_BAD_REQUEST,
-                    detail="Simulation ID is required for non-default duration. Please run simulation first.",
-            )
-        else:
-            try:
-                temporal_client = await Client.connect(TEMPORAL_URL)
-                handle = temporal_client.get_workflow_handle(f"simulation-{simulation_id}")
-                desc = await handle.describe()
-                status_name = desc.status.name
-
-                if status_name in ["RUNNING", "CONTINUED_AS_NEW"]:
-                    raise HTTPException(
-                        status_code=status.HTTP_425_TOO_EARLY,
-                        detail="Simulation is still running.",
-                    )
-                elif status_name != "COMPLETED":
-                    raise HTTPException(
-                        status_code=status.HTTP_400_BAD_REQUEST,
-                        detail=f"Simulation failed with status: {status_name}",
-                    )
-            except HTTPException:
-                raise
-            except Exception as e:
-                # Handle connection errors or invalid workflow IDs
+    if simulation_id:
+        try:
+            temporal_client = await Client.connect(TEMPORAL_URL)
+            handle = temporal_client.get_workflow_handle(f"simulation-{simulation_id}")
+            desc = await handle.describe()
+            status_name = desc.status.name
+
+            if status_name in ["RUNNING", "CONTINUED_AS_NEW"]:
+                raise HTTPException(
+                    status_code=status.HTTP_425_TOO_EARLY,
+                    detail="Simulation is still running.",
+                )
+            elif status_name != "COMPLETED":
                 raise HTTPException(
-                    status_code=status.HTTP_404_NOT_FOUND,
-                    detail=f"Simulation not found or error checking status: {str(e)}",
+                    status_code=status.HTTP_400_BAD_REQUEST,
+                    detail=f"Simulation failed with status: {status_name}",
                 )
+        except HTTPException:
+            raise
+        except Exception as e:
+            # Handle connection errors or invalid workflow IDs
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Simulation not found or error checking status: {str(e)}",
+            )
     else:
+        if duration != 17520 or oh_duration != 1200:
+             raise HTTPException(
+                    status_code=status.HTTP_400_BAD_REQUEST,
+                    detail="Simulation ID is required for non-default duration or OH duration. Please run simulation first.",
+            )
         simulation_id = TR_RBD_ID