Add workplan execution queue

api/models/__init__.py

@@ -21,6 +21,7 @@ from api.models.tpsc import TPSCCatalog, TPSCSnapshot, TPSCEntry
 from api.models.doi_cache import DOICache
 from api.models.token_event import TokenEvent
 from api.models.interface_change import InterfaceChange
+from api.models.workplan_launch_request import WorkplanLaunchRequest
 
 __all__ = [
     "Base",
@@ -46,4 +47,5 @@ __all__ = [
     "DOICache",
     "TokenEvent",
     "InterfaceChange",
+    "WorkplanLaunchRequest",
 ]