feat: form-input library with schema parsing and endpoint

backend/app/flows/store.py

@@ -10,6 +10,7 @@ from sqlmodel import Session, func, select
 
 from app.models import ApprovalTask, FlowDefinition, FlowRun, FlowVersion
 
+from . import input_schema as form_schema
 from .schemas import ApprovalCreate, FlowDefinitionCreate, FlowVersionCreate
 
 
@@ -154,6 +155,9 @@ def create_version(
         version_no=(max_no or 0) + 1,
         langflow_json=data.langflow_json,
         author=data.author,
+        # Single choke point: sync, import, and API creation all cache the
+        # form schema here, so reads never re-parse.
+        input_schema=form_schema.extract_form_schema(data.langflow_json),
     )
     session.add(version)
     session.commit()