diff --git a/ingester/src/stream_handler/mock_sink.rs b/ingester/src/dml_sink/mock_sink.rs
similarity index 100%
rename from ingester/src/stream_handler/mock_sink.rs
rename to ingester/src/dml_sink/mock_sink.rs
diff --git a/ingester/src/dml_sink/mod.rs b/ingester/src/dml_sink/mod.rs
new file mode 100644
index 0000000000..7aed0b7a52
--- /dev/null
+++ b/ingester/src/dml_sink/mod.rs
@@ -0,0 +1,5 @@
+mod r#trait;
+pub(crate) use r#trait::*;
+
+#[cfg(test)]
+pub(crate) mod mock_sink;
diff --git a/ingester/src/stream_handler/sink.rs b/ingester/src/dml_sink/trait.rs
similarity index 100%
rename from ingester/src/stream_handler/sink.rs
rename to ingester/src/dml_sink/trait.rs
diff --git a/ingester/src/lib.rs b/ingester/src/lib.rs
index 30e3fbc005..9dd8ae0111 100644
--- a/ingester/src/lib.rs
+++ b/ingester/src/lib.rs
@@ -20,6 +20,8 @@
 mod arcmap;
 pub(crate) mod compact;
 pub mod data;
+mod deferred_load;
+mod dml_sink;
 pub mod handler;
 mod job;
 pub mod lifecycle;
@@ -28,7 +30,5 @@ pub mod querier_handler;
 pub(crate) mod query_adaptor;
 pub mod server;
 pub(crate) mod stream_handler;
-
-mod deferred_load;
 #[cfg(test)]
 pub(crate) mod test_util;
diff --git a/ingester/src/server/grpc/rpc_write.rs b/ingester/src/server/grpc/rpc_write.rs
index 5d6f60b3b9..26956d6464 100644
--- a/ingester/src/server/grpc/rpc_write.rs
+++ b/ingester/src/server/grpc/rpc_write.rs
@@ -9,7 +9,7 @@ use observability_deps::tracing::*;
 use thiserror::Error;
 use tonic::{Request, Response};
 
-use crate::{data::DmlApplyAction, stream_handler::DmlSink};
+use crate::{data::DmlApplyAction, dml_sink::DmlSink};
 
 // A list of error states when handling an RPC write request.
 //
@@ -177,7 +177,7 @@ mod tests {
         Column, DatabaseBatch, TableBatch,
     };
 
-    use crate::stream_handler::mock_sink::MockDmlSink;
+    use crate::dml_sink::mock_sink::MockDmlSink;
 
     use super::*;
 
diff --git a/ingester/src/stream_handler/handler.rs b/ingester/src/stream_handler/handler.rs
index 94489d34e4..ed46e42a78 100644
--- a/ingester/src/stream_handler/handler.rs
+++ b/ingester/src/stream_handler/handler.rs
@@ -1,8 +1,8 @@
 //! A handler of streamed ops from a write buffer.
 
-use super::DmlSink;
 use crate::{
     data::DmlApplyAction,
+    dml_sink::DmlSink,
     lifecycle::{LifecycleHandle, LifecycleHandleImpl},
 };
 use data_types::{SequenceNumber, ShardId, ShardIndex};
@@ -510,8 +510,8 @@ fn metric_attrs(
 mod tests {
     use super::*;
     use crate::{
+        dml_sink::mock_sink::MockDmlSink,
         lifecycle::{LifecycleConfig, LifecycleManager},
-        stream_handler::mock_sink::MockDmlSink,
     };
     use assert_matches::assert_matches;
     use async_trait::async_trait;
diff --git a/ingester/src/stream_handler/mod.rs b/ingester/src/stream_handler/mod.rs
index 5e9a351fe4..1a7f828c39 100644
--- a/ingester/src/stream_handler/mod.rs
+++ b/ingester/src/stream_handler/mod.rs
@@ -16,17 +16,13 @@
 //! [`WriteBufferReading`]: write_buffer::core::WriteBufferReading
 //! [`LifecycleManager`]: crate::lifecycle::LifecycleManager
 //! [`LifecycleHandle::can_resume_ingest()`]: crate::lifecycle::LifecycleHandle::can_resume_ingest()
+//! [`DmlSink`]: crate::dml_sink::DmlSink
 
 pub(crate) mod handler;
 mod periodic_watermark_fetcher;
-mod sink;
 
-#[cfg(test)]
-pub mod mock_sink;
 #[cfg(test)]
 pub mod mock_watermark_fetcher;
 pub(crate) mod sink_adaptor;
 pub(crate) mod sink_instrumentation;
-
 pub(crate) use periodic_watermark_fetcher::*;
-pub(crate) use sink::*;
diff --git a/ingester/src/stream_handler/sink_adaptor.rs b/ingester/src/stream_handler/sink_adaptor.rs
index 3780f3da5b..30490ccf75 100644
--- a/ingester/src/stream_handler/sink_adaptor.rs
+++ b/ingester/src/stream_handler/sink_adaptor.rs
@@ -6,9 +6,9 @@ use async_trait::async_trait;
 use data_types::ShardId;
 use dml::DmlOperation;
 
-use super::DmlSink;
 use crate::{
     data::{DmlApplyAction, IngesterData},
+    dml_sink::DmlSink,
     lifecycle::LifecycleHandleImpl,
 };
 
diff --git a/ingester/src/stream_handler/sink_instrumentation.rs b/ingester/src/stream_handler/sink_instrumentation.rs
index ab74edd895..b7548bf583 100644
--- a/ingester/src/stream_handler/sink_instrumentation.rs
+++ b/ingester/src/stream_handler/sink_instrumentation.rs
@@ -9,9 +9,7 @@ use iox_time::{SystemProvider, TimeProvider};
 use metric::{Attributes, DurationHistogram, U64Counter, U64Gauge};
 use trace::span::{SpanExt, SpanRecorder};
 
-use crate::data::DmlApplyAction;
-
-use super::DmlSink;
+use crate::{data::DmlApplyAction, dml_sink::DmlSink};
 
 /// A [`WatermarkFetcher`] abstracts a source of the write buffer high watermark
 /// (max known offset).
@@ -237,8 +235,9 @@ where
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::stream_handler::{
-        mock_sink::MockDmlSink, mock_watermark_fetcher::MockWatermarkFetcher,
+    use crate::{
+        dml_sink::mock_sink::MockDmlSink,
+        stream_handler::mock_watermark_fetcher::MockWatermarkFetcher,
     };
     use assert_matches::assert_matches;
     use data_types::{NamespaceId, Sequence, SequenceNumber, ShardId, TableId};