diff --git a/hbs2-storage-ncq/lib/HBS2/Storage/NCQ.hs b/hbs2-storage-ncq/lib/HBS2/Storage/NCQ.hs
index 299e50b4..3c158f1a 100644
--- a/hbs2-storage-ncq/lib/HBS2/Storage/NCQ.hs
+++ b/hbs2-storage-ncq/lib/HBS2/Storage/NCQ.hs
@@ -169,6 +169,7 @@ data NCQStorage =
   , ncqFsyncNum       :: TVar Int
   , ncqFlushNow       :: TVar [TQueue ()]
   , ncqMergeReq       :: TVar Int
+  , ncqCompactReq     :: TVar Int
   , ncqOpenDone       :: TMVar Bool
   , ncqStopped        :: TVar Bool
   }
@@ -417,9 +418,10 @@ ncqStorageRun ncq@NCQStorage{..} = flip runContT pure do
   writer      <- makeWriter indexQ
   indexer     <- makeIndexer writer indexQ
   merge       <- makeMerge
+  compact     <- makeCompact
   flagWatcher <- makeFlagWatcher
 
-  mapM_ waitCatch [writer,indexer,merge]
+  mapM_ waitCatch [writer,indexer,merge,compact]
   -- mapM_ waitCatch [writer,indexer,refsWriter] -- ,indexer,refsWriter]
   mapM_ cancel  [reader,flagWatcher]
 
@@ -440,13 +442,15 @@ ncqStorageRun ncq@NCQStorage{..} = flip runContT pure do
 
     makeFlagWatcher = do
       let flags = ncqGetFileName ncq ".flags"
-      let needIndexFlag = flags </> "index:now"
-      let needMergeFlag = flags </> "merge:now"
+      let needIndexFlag = flags   </> "index:now"
+      let needMergeFlag = flags   </> "merge:now"
+      let needCompactFlag = flags </> "compact:now"
 
       ContT $ withAsync $ fix \again -> do
         pause @'Seconds 1
         needIndex <- doesPathExist needIndexFlag
         needMerge <- doesPathExist needMergeFlag
+        needCompact <- doesPathExist needCompactFlag
 
         when needIndex do
           rm needIndexFlag
@@ -456,6 +460,11 @@ ncqStorageRun ncq@NCQStorage{..} = flip runContT pure do
           rm needMergeFlag
           ncqStorageMerge ncq
 
+        when needCompact do
+          rm needCompactFlag
+          ncqStorageCompact ncq
+
+
         again
 
     makeReader = do
@@ -485,6 +494,32 @@ ncqStorageRun ncq@NCQStorage{..} = flip runContT pure do
       link reader
       pure reader
 
+    makeCompact = do
+
+      me <- ContT $ withAsync $ untilStopped do
+
+        req <- atomically do
+                 stop <- readTVar ncqStopped
+                 req  <- readTVar ncqCompactReq
+
+                 if | stop      -> pure 0
+                    | req  > 0  -> pure req
+                    | otherwise -> STM.retry
+
+        when (req > 0) do
+          atomically $ writeTVar ncqCompactReq 0
+          debug $ "STARTED COMPACT" <+> pretty req
+
+          try @_ @SomeException (ncqCompact ncq) >>= \case
+            Right{} -> none
+            Left e -> do
+              err ("COMPACT ERROR:" <+> viaShow e)
+              pause @'Seconds 5
+
+
+      link me
+      pure me
+
     makeMerge = do
       me <- ContT $ withAsync $ untilStopped do
         micropause @'Seconds 10
@@ -1217,6 +1252,7 @@ ncqStorageInit_ check path = do
   ncqCurrentFd      <- newTVarIO Nothing
   ncqIndexed        <- newTVarIO mempty
   ncqMergeReq       <- newTVarIO 0
+  ncqCompactReq     <- newTVarIO 0
   ncqFsyncNum       <- newTVarIO 0
   ncqLock           <- newTVarIO ncqLock_
 
@@ -1605,6 +1641,9 @@ ncqLinearScanForCompact ncq@NCQStorage{..} action = do
 
   readTVarIO bodyCount
 
+ncqStorageCompact :: MonadUnliftIO m => NCQStorage -> m ()
+ncqStorageCompact NCQStorage{..} = do
+  atomically $ modifyTVar ncqCompactReq succ
 
 ncqCompact :: MonadUnliftIO m => NCQStorage -> m ()
 ncqCompact ncq@NCQStorage{..} = do
@@ -1622,20 +1661,17 @@ ncqCompact ncq@NCQStorage{..} = do
     let fDataNameA = ncqGetDataFileName ncq fk
     let fIndexNameA = ncqGetIndexFileName ncq fk
 
-    flip runContT pure $ callCC \exit -> do
-
+    flip runContT pure do
 
       mfile <- ncqGetNewCompactName ncq
 
       ContT $ bracket none $ const do
         rm mfile
 
-      liftIO $ withBinaryFileAtomic mfile WriteMode $ \fwh -> do
-
-        writeFiltered ncq fDataNameA fwh $ \_ _ k v -> do
-          pure $ not $ HS.member k es
-
       liftIO do
+        withBinaryFileAtomic mfile WriteMode $ \fwh -> do
+                writeFiltered ncq fDataNameA fwh $ \_ _ k v -> do
+                  pure $ not $ HS.member k es
 
         result <- fileSize mfile
 
@@ -1660,3 +1696,6 @@ ncqCompact ncq@NCQStorage{..} = do
 
         mapM_ rm [fDataNameA, fIndexNameA]
 
+  debug $ "compact done" <+> pretty (HM.size state0)
+
+