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diff --git a/lib/Server/Base.hs b/lib/Server/Base.hs
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+
+module Server.Base (ServerState) where
+
+import           Control.Concurrent.STM (TQueue, TVar)
+import qualified Data.Map               as M
+import           Data.UUID              (UUID)
+import           Persist                (TrainPing)
+
+type ServerState = TVar (M.Map UUID [TQueue (Maybe TrainPing)])