diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -16,7 +16,7 @@
 
 import Database.Persist hiding (Entity (..))
 import Database.Persist.Store
-import Database.Persist.GenericSql hiding (Key(..))
+import Database.Persist.GenericSql hiding (Key)
 import Database.Persist.GenericSql.Internal
 import Database.Persist.EntityDef
 
@@ -32,7 +32,6 @@
 
 import Control.Exception (throw)
 import Control.Monad.IO.Class (MonadIO (..))
-import Control.Monad.Trans.Control (MonadBaseControl)
 import Data.List (intercalate)
 import Data.IORef
 import qualified Data.Map as Map
@@ -178,9 +177,8 @@
                   LibPQ.TuplesOk -> return ()
                   _ -> do
                     msg <- LibPQ.resStatus status
-                    mmsg <- LibPQ.resultErrorMessage ret
                     fail $ "Postgresql.withStmt': bad result status " ++
-                           show status ++ " (" ++ (maybe (show msg) (show . (,) msg) mmsg) ++ ")"
+                           show status ++ " (" ++ show msg ++ ")"
 
                 -- Get number and type of columns
                 cols <- LibPQ.nfields ret
@@ -374,7 +372,7 @@
     getAltersU :: [(DBName, [DBName])]
                -> [(DBName, [DBName])]
                -> [AlterTable]
-    getAltersU [] old = map DropConstraint $ filter (not . isManual) $ map fst old
+    getAltersU [] old = map (DropConstraint . fst) old
     getAltersU ((name, cols):news) old =
         case lookup name old of
             Nothing -> AddUniqueConstraint name cols : getAltersU news old
@@ -385,9 +383,6 @@
                         else  DropConstraint name
                             : AddUniqueConstraint name cols
                             : getAltersU news old'
-
-    -- Don't drop constraints which were manually added.
-    isManual (DBName x) = "__manual_" `T.isPrefixOf` x
 
 getColumn :: (Text -> IO Statement)
           -> DBName -> [PersistValue]
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         1.0.3
+version:         1.1.0
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>
@@ -17,7 +17,7 @@
                    , transformers          >= 0.2.1    && < 0.4
                    , postgresql-simple     >= 0.2      && < 0.3
                    , postgresql-libpq      >= 0.6.1    && < 0.9
-                   , persistent            >= 1.0.2    && < 1.1
+                   , persistent            >= 1.1      && < 1.2
                    , containers            >= 0.2
                    , bytestring            >= 0.9
                    , text                  >= 0.7      && < 0.12