For safety uninstalling 2sxc doesn't remove the tables. Use this to do it manually for 2sxc v8 up to v11:

1. Make sure you are on the right DB!
2. Copy the following script and run it a few times
   You'll see errors about constraints from other tables, but every time you run it a few more tables are gone till all are removed.

Drop Table if Exists dbo.ToSIC_EAV_Apps
Drop Table if Exists dbo.ToSIC_EAV_AssignmentObjectTypes
Drop Table if Exists dbo.ToSIC_EAV_Attachments
Drop Table if Exists dbo.ToSIC_EAV_AttributeGroups
Drop Table if Exists dbo.ToSIC_EAV_Attributes
Drop Table if Exists dbo.ToSIC_EAV_AttributeSets
Drop Table if Exists dbo.ToSIC_EAV_AttributesInSets
Drop Table if Exists dbo.ToSIC_EAV_AttributeTypes
Drop Table if Exists dbo.ToSIC_EAV_ChangeLog
Drop Table if Exists dbo.ToSIC_EAV_ContextInfo
Drop Table if Exists dbo.ToSIC_EAV_DataTimeline
Drop Table if Exists dbo.ToSIC_EAV_Dimensions
Drop Table if Exists dbo.ToSIC_EAV_Entities
Drop Table if Exists dbo.ToSIC_EAV_EntityRelationships
Drop Table if Exists dbo.ToSIC_EAV_Values
Drop Table if Exists dbo.ToSIC_EAV_ValuesDimensions
Drop Table if Exists dbo.ToSIC_EAV_Zones

1. To remove the stored procedures use this

Drop Procedure If Exists dbo.ToSIC_EAV_ChangeLogAdd
Drop Procedure If Exists dbo.ToSIC_EAV_ChangeLogGet
Drop Procedure If Exists dbo.ToSIC_EAV_ChangeLogSet
Drop Procedure If Exists dbo.ToSIC_EAV_DeleteApp
Drop Procedure If Exists dbo.ToSIC_EAV_LogToTimeline