feat: add subscriptions

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/crunch-traits/src/errors.rs

@@ -0,0 +1,43 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum SerializeError {
+    #[error("failed to serialize {0}")]
+    FailedToSerialize(anyhow::Error),
+}
+
+#[derive(Error, Debug)]
+pub enum DeserializeError {
+    #[error("failed to serialize {0}")]
+    FailedToDeserialize(anyhow::Error),
+}
+
+#[derive(Error, Debug)]
+pub enum PublishError {
+    #[error("failed to serialize {0}")]
+    SerializeError(#[source] SerializeError),
+
+    #[error("failed to commit to database {0}")]
+    DbError(#[source] anyhow::Error),
+
+    #[error("transaction failed {0}")]
+    DbTxError(#[source] anyhow::Error),
+
+    #[error("failed to connect to database {0}")]
+    ConnectionError(#[source] anyhow::Error),
+}
+
+#[derive(Error, Debug)]
+pub enum TransportError {
+    #[error("to publish to transport {0}")]
+    Err(anyhow::Error),
+}
+
+#[derive(Error, Debug)]
+pub enum PersistenceError {
+    #[error("failed to get item {0}")]
+    GetErr(anyhow::Error),
+
+    #[error("failed to publish item {0}")]
+    UpdatePublished(anyhow::Error),
+}