Add market data backfilling

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/types/mod.rs

@@ -0,0 +1,22 @@
+pub mod api;
+pub mod asset;
+pub mod bar;
+pub mod class;
+pub mod exchange;
+pub mod source;
+pub mod status;
+pub mod websocket;
+
+pub use asset::Asset;
+pub use bar::Bar;
+pub use class::Class;
+pub use exchange::Exchange;
+pub use source::Source;
+pub use status::Status;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum BroadcastMessage {
+    Asset(asset::BroadcastMessage),
+}