diff --git a/crates/domain/src/ports.rs b/crates/domain/src/ports.rs
index 14d848e..a1f477d 100644
--- a/crates/domain/src/ports.rs
+++ b/crates/domain/src/ports.rs
@@ -144,6 +144,10 @@ pub trait DiaryRepository: Send + Sync {
     ) -> Result<Paginated<FeedEntry>, DomainError>;
     async fn get_review_history(&self, movie_id: &MovieId) -> Result<ReviewHistory, DomainError>;
     async fn get_user_history(&self, user_id: &UserId) -> Result<Vec<DiaryEntry>, DomainError>;
+    fn stream_user_history(
+        &self,
+        user_id: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>;
     async fn get_movie_stats(&self, movie_id: &MovieId) -> Result<MovieStats, DomainError>;
     async fn get_movie_social_feed(
         &self,
@@ -253,13 +257,12 @@ pub trait PasswordHasher: Send + Sync {
     async fn verify(&self, plain_password: &str, hash: &PasswordHash) -> Result<bool, DomainError>;
 }
 
-#[async_trait]
 pub trait DiaryExporter: Send + Sync {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        entries: &[DiaryEntry],
+        stream: futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>,
         format: ExportFormat,
-    ) -> Result<Vec<u8>, DomainError>;
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, DomainError>>;
 }
 
 #[async_trait]
diff --git a/crates/domain/src/testing/fakes.rs b/crates/domain/src/testing/fakes.rs
index c36f340..8bb9cf9 100644
--- a/crates/domain/src/testing/fakes.rs
+++ b/crates/domain/src/testing/fakes.rs
@@ -154,6 +154,13 @@ impl DiaryRepository for FakeDiaryRepository {
         Ok(vec![])
     }
 
+    fn stream_user_history(
+        &self,
+        _user_id: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        Box::pin(futures::stream::empty())
+    }
+
     async fn get_movie_stats(&self, _movie_id: &MovieId) -> Result<MovieStats, DomainError> {
         Ok(MovieStats {
             total_count: 0,
diff --git a/crates/domain/src/testing/panics.rs b/crates/domain/src/testing/panics.rs
index 5484f63..b491927 100644
--- a/crates/domain/src/testing/panics.rs
+++ b/crates/domain/src/testing/panics.rs
@@ -49,6 +49,12 @@ impl DiaryRepository for PanicDiaryRepository {
     async fn get_user_history(&self, _: &UserId) -> Result<Vec<DiaryEntry>, DomainError> {
         panic!("PanicDiaryRepository called")
     }
+    fn stream_user_history(
+        &self,
+        _: UserId,
+    ) -> futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>> {
+        panic!("PanicDiaryRepository called")
+    }
     async fn get_movie_stats(&self, _: &MovieId) -> Result<MovieStats, DomainError> {
         panic!("PanicDiaryRepository called")
     }
@@ -250,13 +256,12 @@ impl PosterFetcherClient for PanicPosterFetcher {
 
 pub struct PanicDiaryExporter;
 
-#[async_trait]
 impl DiaryExporter for PanicDiaryExporter {
-    async fn serialize_entries(
+    fn stream_entries(
         &self,
-        _: &[DiaryEntry],
-        _: ExportFormat,
-    ) -> Result<Vec<u8>, DomainError> {
+        _stream: futures::stream::BoxStream<'static, Result<DiaryEntry, DomainError>>,
+        _format: ExportFormat,
+    ) -> futures::stream::BoxStream<'static, Result<bytes::Bytes, DomainError>> {
         panic!("PanicDiaryExporter called")
     }
 }