diff --git a/selda-postgresql.cabal b/selda-postgresql.cabal
--- a/selda-postgresql.cabal
+++ b/selda-postgresql.cabal
@@ -1,5 +1,5 @@
 name:                selda-postgresql
-version:             0.1.1.0
+version:             0.1.2.0
 synopsis:            PostgreSQL backend for the Selda database EDSL.
 description:         PostgreSQL backend for the Selda database EDSL.
                      Requires the PostgreSQL @libpq@ development libraries to be
@@ -26,10 +26,10 @@
     OverloadedStrings
     CPP
   build-depends:
-      base             >=4.8   && <5
-    , exceptions       >=0.8   && <0.9
-    , selda            >=0.1.1 && <0.2
-    , text             >=1.0   && <1.3
+      base             >=4.8     && <5
+    , exceptions       >=0.8     && <0.9
+    , selda            >=0.1.3.2 && <0.2
+    , text             >=1.0     && <1.3
   if !flag(haste)
     build-depends:
         bytestring       >=0.9 && <0.11
diff --git a/src/Database/Selda/PostgreSQL.hs b/src/Database/Selda/PostgreSQL.hs
--- a/src/Database/Selda/PostgreSQL.hs
+++ b/src/Database/Selda/PostgreSQL.hs
@@ -1,8 +1,10 @@
 {-# LANGUAGE OverloadedStrings, RecordWildCards, GADTs, CPP #-}
 -- | PostgreSQL backend for Selda.
 module Database.Selda.PostgreSQL
-  ( PGConnectInfo (..), PGConnectException (..)
+  ( PGConnectInfo (..)
   , withPostgreSQL, on, auth
+  , pgBackend
+  , pgConnString
   ) where
 import Data.Monoid
 import qualified Data.Text as T
@@ -15,17 +17,6 @@
 import qualified Data.ByteString.Char8 as BS
 #endif
 
--- | The exception thrown when a connection could not be made to the PostgreSQL
---   server.
-data PGConnectException = PGConnectException String
-  deriving Show
-instance Exception PGConnectException
-
--- | The exception thrown when a query fails.
-data PGQueryException = PGQueryException String
-  deriving Show
-instance Exception PGQueryException
-
 -- | PostgreSQL connection information.
 data PGConnectInfo = PGConnectInfo
   { -- | Host to connect to.
@@ -84,10 +75,11 @@
     ConnectionOk -> runSeldaT m (pgBackend conn) `finally` liftIO (finish conn)
     nope         -> connFailed nope
   where
-    connFailed f = throwM $ PGConnectException $ unwords
+    connFailed f = throwM $ DbError $ unwords
       [ "unable to connect to postgres server: " ++ show f
       ]
 
+-- | Create a `SeldaBackend` for PostgreSQL `Connection`
 pgBackend :: Connection -> SeldaBackend
 pgBackend c = SeldaBackend
   { runStmt        = \q ps -> right <$> pgQueryRunner c False q ps
@@ -101,6 +93,7 @@
     right (Right x) = x
     right _         = error "impossible"
 
+-- | Convert `PGConnectInfo` into `ByteString`
 pgConnString :: PGConnectInfo -> BS.ByteString
 pgConnString PGConnectInfo{..} = mconcat
   [ "host=", encodeUtf8 pgHost, " "
@@ -123,12 +116,12 @@
       Just res -> do
         st <- resultStatus res
         case st of
-          BadResponse       -> throwM $ PGQueryException "bad response"
-          FatalError        -> throwM $ PGQueryException errmsg
-          NonfatalError     -> throwM $ PGQueryException errmsg
+          BadResponse       -> throwM $ SqlError "bad response"
+          FatalError        -> throwM $ SqlError errmsg
+          NonfatalError     -> throwM $ SqlError errmsg
           _ | return_lastid -> Left <$> getLastId res
             | otherwise     ->Right <$> getRows res
-      Nothing           -> error "unable to submit query to server"
+      Nothing           -> throwM $ DbError "unable to submit query to server"
   where
     errmsg = "error executing query `" ++ T.unpack q' ++ "'"
     q' | return_lastid = q <> " RETURNING LASTVAL();"
@@ -164,7 +157,7 @@
   | t == intType     = SqlInt $ read (BS.unpack val)
   | t == doubleType  = SqlFloat $ read (BS.unpack val)
   | t `elem` textish = SqlString (decodeUtf8 val)
-  | otherwise        = error $ "result with unknown type oid: " ++ show t
+  | otherwise        = error $ "BUG: result with unknown type oid: " ++ show t
   where
     textish = [textType, timestampType, timeType, dateType]
     readBool "f"   = False
@@ -201,7 +194,7 @@
     Nothing
 
 -- | OIDs for all types used by Selda.
-boolType, intType, textType, doubleType :: Oid
+boolType, intType, textType, doubleType, dateType, timeType, timestampType :: Oid
 boolType      = Oid 16
 intType       = Oid 20
 textType      = Oid 25