Replace native SQL which retrieves issue count with type safe DSL.

src/main/scala/model/IssueLabels.scala

@@ -0,0 +1,17 @@
+package model
+
+import scala.slick.driver.H2Driver.simple._
+
+object IssueLabels extends Table[IssueLabel]("ISSUE_LABEL") with Functions {
+  def userName = column[String]("USER_NAME", O PrimaryKey)
+  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
+  def issueId = column[Int]("ISSUE_ID", O PrimaryKey)
+  def labelId = column[Int]("LABEL_ID", O PrimaryKey)
+  def * = userName ~ repositoryName ~ issueId ~ labelId <> (IssueLabel, IssueLabel.unapply _)
+}
+
+case class IssueLabel(
+  userName: String,
+  repositoryName: String,
+  issueId: Int,
+  labelId: Int)