graph: Move Send trait from Store to BasicStore
@@ -117,7 +117,7 @@ impl fmt::Display for EventSource {
}
/// Common trait for store implementations that don't require interaction with the system.
-pub trait BasicStore {
+pub trait BasicStore: Send {
/// Looks up an entity using the given store key.
fn get(&self, key: StoreKey) -> Result<Entity, ()>;
