diff --git a/lib/sqlsync/examples/end-to-end-local-net.rs b/lib/sqlsync/examples/end-to-end-local-net.rs
index 00f5598..957d707 100644
--- a/lib/sqlsync/examples/end-to-end-local-net.rs
+++ b/lib/sqlsync/examples/end-to-end-local-net.rs
@@ -80,7 +80,7 @@ fn start_server<'a>(
     let coordinator = CoordinatorDocument::open(
         storage_journal,
         MemoryJournalFactory,
-        &wasm_bytes[..],
+        WasmReducer::new(wasm_bytes.as_slice())?,
     )?;
     let coordinator = Arc::new(Mutex::new(coordinator));
 
@@ -112,7 +112,7 @@ fn start_server<'a>(
 }
 
 fn handle_client(
-    doc: Arc<Mutex<CoordinatorDocument<MemoryJournal>>>,
+    doc: Arc<Mutex<CoordinatorDocument<MemoryJournal, WasmReducer>>>,
     socket: TcpStream,
 ) -> anyhow::Result<()> {
     log::info!("server: received client connection");
diff --git a/lib/sqlsync/src/coordinator.rs b/lib/sqlsync/src/coordinator.rs
index 50e1862..1f444ee 100644
--- a/lib/sqlsync/src/coordinator.rs
+++ b/lib/sqlsync/src/coordinator.rs
@@ -8,7 +8,7 @@ use rusqlite::Transaction;
 
 use crate::db::{open_with_vfs, run_in_tx, ConnectionPair};
 use crate::error::Result;
-use crate::reducer::{Reducer, WasmReducer};
+use crate::reducer::Reducer;
 use crate::replication::{
     ReplicationDestination, ReplicationError, ReplicationSource,
 };
@@ -47,7 +47,7 @@ impl<J: Journal, R: Reducer> CoordinatorDocument<J, R> {
     pub fn open(
         storage: J,
         timeline_factory: J::Factory,
-        reducer: R, // reducer_wasm_bytes: &[u8],
+        reducer: R,
     ) -> Result<Self> {
         let (mut sqlite, mut storage) = open_with_vfs(storage)?;
 
@@ -141,7 +141,7 @@ impl<J: Journal, R: Reducer> CoordinatorDocument<J, R> {
 }
 
 /// CoordinatorDocument knows how to replicate it's storage journal
-impl<J: Journal + ReplicationSource, R: Reducer> ReplicationSource
+impl<J: Journal + ReplicationSource, R> ReplicationSource
     for CoordinatorDocument<J, R>
 {
     type Reader<'a> = <J as ReplicationSource>::Reader<'a>
diff --git a/lib/sqlsync/src/timeline.rs b/lib/sqlsync/src/timeline.rs
index 1da5035..8cdf669 100644
--- a/lib/sqlsync/src/timeline.rs
+++ b/lib/sqlsync/src/timeline.rs
@@ -9,7 +9,6 @@ use crate::{
     lsn::{Lsn, LsnRange},
     positioned_io::PositionedReader,
     reducer::{Reducer, ReducerError, WasmReducer},
-    JournalError,
 };
 
 const TIMELINES_TABLE_SQL: &str = "