feat: better error handling

crates/delta/src/util/catchers.rs

@@ -0,0 +1,19 @@
+use rocket::{catch, Catcher, Request};
+use revolt_result::{create_error, Error, Result};
+
+#[catch(404)]
+pub fn not_found() -> Result<()> {
+    Err(create_error!(NotFound))
+}
+
+#[catch(422)]
+pub fn unprocessable_entity(req: &Request) -> Result<()> {
+    match req.local_cache(|| None::<Error>) {
+        Some(e) => Err(e.clone()),
+        None => Err(create_error!(UnprocessableEntity))
+    }
+}
+
+pub fn all_catchers() -> Vec<Catcher> {
+    catchers![not_found, unprocessable_entity]
+}