more i/o with actors leads to new database issues ..

[ERROR] [12/08/2013 02:03:14.770]
[simplexPE-akka.actor.default-dispatcher-13] [akka://simplexPE/user/$l]
SqlMappingError(too many rows when expecting a single one)
java.lang.RuntimeException: SqlMappingError(too many rows when expecting
a single one)
	at scala.sys.package$.error(package.scala:27)
	at anorm.Sql$.as(Anorm.scala:537)
	at anorm.Sql$class.as(Anorm.scala:455)
	at anorm.SimpleSql.as(Anorm.scala:372)
	at models.XTransition$$anonfun$latestOne$1.apply(XTransition.scala:85)
	at models.XTransition$$anonfun$latestOne$1.apply(XTransition.scala:76)
	at play.api.db.DBApi$$anonfun$withTransaction$1.apply(DB.scala:100)
	at play.api.db.DBApi$$anonfun$withTransaction$1.apply(DB.scala:97)
	at play.api.db.DBApi$class.withConnection(DB.scala:82)
	at play.api.db.BoneCPApi.withConnection(DB.scala:276)
	at play.api.db.DBApi$class.withTransaction(DB.scala:97)
	at play.api.db.BoneCPApi.withTransaction(DB.scala:276)
	at play.api.db.DB$$anonfun$withTransaction$4.apply(DB.scala:185)
	at play.api.db.DB$$anonfun$withTransaction$4.apply(DB.scala:185)
	at scala.Option.map(Option.scala:145)
	at play.api.db.DB$.withTransaction(DB.scala:185)
	at models.XTransition$.latestOne(XTransition.scala:76)