gistfile1.scala

scala> List("a", "b", "AA", "d")
res0: List[String] = List(a, b, AA, d)

// List.sortBy, List.sorted and TreeMap all take an implicit scala.math.Ordering
// just define the following at the top of StorageRepoQueries
scala> object CaseInsensitiveOrdering extends Ordering[String] {
     |   def compare(a: String, b: String) = a.toLowerCase compare b.toLowerCase 
     | }
defined module CaseInsensitiveOrdering

// and pass the Ordering object in all places we call sort or create a TreeMap
scala> res0.sorted(CaseInsensitiveOrdering)
res6: List[String] = List(a, AA, b, d)