Checkmk Werk 13890: Resurrect magic column name prefixing for cached state history table

ID: 13890 Title: Resurrect magic column name prefixing for cached state history table Component: Livestatus Level: 2 Class: Bug fix Version: 2.2.0i1 There was a regression in 2.1 which broke the magic prefixing of column names for the statehist table with "current_". This in turn broke various availability-related things in the GUI which relied on that hack.