Major Description
Rather than caching the guideposts on all tenant-specific tables, we should cache them only on the physical table. On the client side, we should also update the cache with the latest for the base multi-tenant table when we update the cache for a tenant-specific table. Then when we lookup the guideposts, we should ensure that we're getting them from the physical table.
Otherwise, it'll be difficult to keep the guideposts cached on the PTable in sync across all tenant-specific tables (not to mention using quite a bit of memory).