diff --git a/crdt-enc/src/lib.rs b/crdt-enc/src/lib.rs
index 476bcca..d85b26a 100644
--- a/crdt-enc/src/lib.rs
+++ b/crdt-enc/src/lib.rs
@@ -1,7 +1,6 @@
 pub mod cryptor;
 pub mod key_cryptor;
 pub mod storage;
-pub mod task;
 pub mod utils;
 
 use crate::{
diff --git a/crdt-enc/src/task.rs b/crdt-enc/src/task.rs
deleted file mode 100644
index f668772..0000000
--- a/crdt-enc/src/task.rs
+++ /dev/null
@@ -1,159 +0,0 @@
-use anyhow::Result;
-use futures::{
-    channel::mpsc,
-    future::{self, BoxFuture, Future, FutureExt},
-    stream::FuturesUnordered,
-    stream::{FusedStream, StreamExt},
-    task::{self, Poll, SpawnError},
-};
-use std::{fmt, pin::Pin, result::Result as StdResult};
-
-// thread_local! {
-//     // need to use `Box<Any>` here, <https://github.com/rust-lang/rust/issues/57775>
-//     static TL_DATA: RefCell<Option<Box<dyn Any + 'static>>> = RefCell::new(None);
-// }
-
-// pub struct TaskMgrAccessor;
-
-// impl TaskMgrAccessor {
-//     pub fn with<T, F, R>(f: F) -> R
-//     where
-//         T: 'static,
-//         F: FnOnce(&mut T) -> R,
-//     {
-//         TL_DATA.with(|data| {
-//             let mut data = data.borrow_mut();
-//             let data = data.as_mut().expect("TaskMgrAccessor data not set");
-//             if let Some(data) = data.downcast_mut::<T>() {
-//                 f(data)
-//             } else {
-//                 panic!(format!(
-//                     "Data in TaskMgrAccessor has wrong type, expected type: {}",
-//                     any::type_name::<T>()
-//                 ));
-//             }
-//         })
-//     }
-
-//     pub fn set_with<T, F, R>(val: T, f: F) -> (T, R)
-//     where
-//         T: 'static,
-//         F: FnOnce() -> R,
-//     {
-//         TL_DATA.with(|data| {
-//             let mut data = data.borrow_mut();
-//             *data = Some(Box::new(val));
-//         });
-
-//         let res = f();
-
-//         let val = TL_DATA.with(|data| {
-//             let mut data = data.borrow_mut();
-//             let data = data.take().expect("TaskMgrAccessor data not set");
-//             if let Ok(data) = data.downcast::<T>() {
-//                 *data
-//             } else {
-//                 panic!(format!(
-//                     "Data in TaskMgrAccessor has wrong type, expected type: {}",
-//                     any::type_name::<T>()
-//                 ));
-//             }
-//         });
-
-//         (val, res)
-//     }
-// }
-
-pub struct TaskMgrExecutor {
-    futs: FuturesUnordered<BoxFuture<'static, Result<()>>>,
-    rx: mpsc::UnboundedReceiver<BoxFuture<'static, Result<()>>>,
-}
-
-impl Future for TaskMgrExecutor {
-    type Output = Result<()>;
-
-    fn poll(mut self: Pin<&mut Self>, ctx: &mut task::Context) -> Poll<Self::Output> {
-        while let Poll::Ready(Some(fut)) = self.rx.poll_next_unpin(ctx) {
-            self.futs.push(fut);
-        }
-
-        if self.futs.is_empty() {
-            if self.rx.is_terminated() {
-                // no running tasks & the receiver closed => exit
-                return Poll::Ready(Ok(()));
-            } else {
-                return Poll::Pending;
-            }
-        }
-
-        while let Poll::Ready(res) = self.futs.poll_next_unpin(ctx) {
-            match res {
-                Some(Ok(())) => {}
-                Some(Err(err)) => {
-                    return Poll::Ready(Err(err));
-                }
-                None => {
-                    return Poll::Ready(Ok(()));
-                }
-            }
-        }
-
-        Poll::Pending
-    }
-}
-
-impl fmt::Debug for TaskMgrExecutor {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("TaskMgrExecutor").finish()
-    }
-}
-
-#[derive(Clone)]
-pub struct TaskMgr {
-    tx: mpsc::UnboundedSender<BoxFuture<'static, Result<()>>>,
-}
-
-impl TaskMgr {
-    pub fn new() -> (Self, TaskMgrExecutor) {
-        let (tx, rx) = mpsc::unbounded();
-
-        (
-            TaskMgr { tx },
-            TaskMgrExecutor {
-                futs: FuturesUnordered::new(),
-                rx,
-            },
-        )
-    }
-
-    pub fn spawn<F>(&self, fut: F) -> StdResult<(), SpawnError>
-    where
-        F: 'static + Send + Future<Output = Result<()>>,
-    {
-        self.tx
-            .unbounded_send(fut.boxed())
-            .map_err(|_| SpawnError::shutdown())?;
-        Ok(())
-    }
-
-    pub fn spawn_with_handle<F>(
-        &self,
-        fut: F,
-    ) -> StdResult<future::RemoteHandle<F::Output>, SpawnError>
-    where
-        F: 'static + Send + Future,
-        F::Output: 'static + Send,
-    {
-        let (remote, handle) = fut.remote_handle();
-        self.tx
-            .unbounded_send(remote.map(|()| Result::Ok(())).boxed())
-            .map_err(|_| SpawnError::shutdown())?;
-        Ok(handle)
-    }
-}
-
-impl fmt::Debug for TaskMgr {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("TaskMgr").finish()
-    }
-}