SQL Server Web Edition has not been tested with Sitefinity so it is not officially supported. I have included a link
to a list of the supported system requirements.
Let me know if I can answer anymore questions for you.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items