diff --git a/data-model/src/store.rs b/data-model/src/store.rs
index b04abc6..da7effb 100644
--- a/data-model/src/store.rs
+++ b/data-model/src/store.rs
@@ -9,7 +9,7 @@ use crate::{
     LengthyEntry, Path,
 };
 
-/// Returned when an entry is successfully ingested into a [`Store`].
+/// Returned when an entry could be ingested into a [`Store`].
 pub enum EntryIngestionSuccess<
     const MCL: usize,
     const MCC: usize,
@@ -32,6 +32,7 @@ pub enum EntryIngestionSuccess<
     },
 }
 
+/// Returned when an entry cannot be ingested into a [`Store`].
 pub enum EntryIngestionError<
     const MCL: usize,
     const MCC: usize,
@@ -45,6 +46,31 @@ pub enum EntryIngestionError<
     WrongNamespace(AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>),
 }
 
+/// Returned when an entry failed to be ingested during a bulk ingestion.
+pub enum BulkIngestionError<
+    const MCL: usize,
+    const MCC: usize,
+    const MPL: usize,
+    N: NamespaceId,
+    S: SubspaceId,
+    PD: PayloadDigest,
+    AT,
+> {
+    /// The entry belonged to another namespace.
+    WrongNamespace(AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>),
+    /// The consumer failed for some reason.
+    ConsumerFailure,
+}
+
+/// A tuple of an [`AuthorisedEntry`] and how a [`Store`] responded to its ingestion.
+pub type BulkIngestionResult<const MCL: usize, const MCC: usize, const MPL: usize, N, S, PD, AT> = (
+    AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>,
+    Result<
+        EntryIngestionSuccess<MCL, MCC, MPL, N, S, PD, AT>,
+        BulkIngestionError<MCL, MCC, MPL, N, S, PD, AT>,
+    >,
+);
+
 /// Return when a payload is successfully appended to the [`Store`].
 pub enum PayloadAppendSuccess<const MCL: usize, const MCC: usize, const MPL: usize, N, S, PD>
 where
@@ -83,6 +109,8 @@ where
     PD: PayloadDigest,
     AT: AuthorisationToken<MCL, MCC, MPL, N, S, PD>,
 {
+    type FlushError;
+
     /// The [namespace](https://willowprotocol.org/specs/data-model/index.html#namespace) which all of this store's [`AuthorisedEntry`] belong to.
     fn namespace_id() -> N;
 
@@ -99,6 +127,12 @@ where
     >;
 
     // TODO: Bulk ingestion entry. The annoying there is it needs its own success / error types. We could get around this by exposing a BulkConsumer from the Store, but [then we need to support multi-writer consumption](https://github.com/earthstar-project/willow-rs/pull/21#issuecomment-2192393204).
+    /// Attempt to store an [`AuthorisedEntry`] in the [`Store`].
+    /// Will fail if the entry belonged to a different namespace than the store's.
+    fn bulk_ingest_entry(
+        &self,
+        authorised_entries: &[AuthorisedEntry<MCL, MCC, MPL, N, S, PD, AT>],
+    ) -> impl Future<Output = Vec<BulkIngestionResult<MCL, MCC, MPL, N, S, PD, AT>>>;
 
     /// Attempt to append part of a payload for a given [`AuthorisedEntry`].
     ///
@@ -181,5 +215,5 @@ where
     ) -> impl Future<Output = Vec<PD>>;
 
     /// Force persistence of all previous mutations
-    fn flush() -> impl Future<Output = ()>;
+    fn flush() -> impl Future<Output = Result<(), Self::FlushError>>;
 }