refactor(routes): add macros to reduce route handler boilerplate

- Create define_get_handler! macro for GET-by-ID endpoints
- Create define_delete_handler! macro for DELETE endpoints with Datastar support
- Apply macros to roasters, roasts, and bags route modules
- Reduces 6 handlers from ~78 lines to ~12 lines total

src/application/routes/bags.rs

@@ -4,6 +4,7 @@ use axum::http::{HeaderMap, StatusCode};
 use axum::response::{IntoResponse, Redirect, Response};
 use serde::Deserialize;
 
+use super::macros::{define_delete_handler, define_get_handler};
 use crate::application::auth::AuthenticatedUser;
 use crate::application::errors::{ApiError, AppError, map_app_error};
 use crate::application::routes::render_html;
@@ -184,14 +185,7 @@ pub(crate) async fn list_bags(
     Ok(Json(bags))
 }
 
-#[tracing::instrument(skip(state))]
-pub(crate) async fn get_bag(
-    State(state): State<AppState>,
-    Path(id): Path<BagId>,
-) -> Result<Json<Bag>, ApiError> {
-    let bag = state.bag_repo.get(id).await.map_err(AppError::from)?;
-    Ok(Json(bag))
-}
+define_get_handler!(get_bag, BagId, Bag, bag_repo);
 
 #[tracing::instrument(skip(state, _auth_user, headers, query))]
 pub(crate) async fn update_bag(
@@ -265,25 +259,13 @@ pub(crate) async fn update_bag(
     }
 }
 
-#[tracing::instrument(skip(state, _auth_user, headers, query))]
-pub(crate) async fn delete_bag(
-    State(state): State<AppState>,
-    _auth_user: AuthenticatedUser,
-    headers: HeaderMap,
-    Path(id): Path<BagId>,
-    Query(query): Query<ListQuery>,
-) -> Result<Response, ApiError> {
-    let request = query.into_request::<BagSortKey>();
-    state.bag_repo.delete(id).await.map_err(AppError::from)?;
-
-    if is_datastar_request(&headers) {
-        render_bag_list_fragment(state, request, true)
-            .await
-            .map_err(ApiError::from)
-    } else {
-        Ok(StatusCode::NO_CONTENT.into_response())
-    }
-}
+define_delete_handler!(
+    delete_bag,
+    BagId,
+    BagSortKey,
+    bag_repo,
+    render_bag_list_fragment
+);
 
 #[derive(Debug, Deserialize)]
 pub struct BagsQuery {

src/application/routes/macros.rs

@@ -0,0 +1,80 @@
+/// Generates a GET-by-ID handler that retrieves an entity from a repository.
+///
+/// # Arguments
+/// * `$fn_name` - Name of the generated handler function
+/// * `$id_type` - Type of the ID path parameter (e.g., `RoasterId`)
+/// * `$entity_type` - Type of the entity returned as JSON (e.g., `Roaster`)
+/// * `$repo_field` - Name of the repository field on `AppState` (e.g., `roaster_repo`)
+///
+/// # Example
+/// ```ignore
+/// define_get_handler!(get_roaster, RoasterId, Roaster, roaster_repo);
+/// ```
+macro_rules! define_get_handler {
+    ($fn_name:ident, $id_type:ty, $entity_type:ty, $repo_field:ident) => {
+        #[tracing::instrument(skip(state))]
+        pub(crate) async fn $fn_name(
+            axum::extract::State(state): axum::extract::State<crate::application::server::AppState>,
+            axum::extract::Path(id): axum::extract::Path<$id_type>,
+        ) -> Result<axum::Json<$entity_type>, crate::application::errors::ApiError> {
+            let entity = state
+                .$repo_field
+                .get(id)
+                .await
+                .map_err(crate::application::errors::AppError::from)?;
+            Ok(axum::Json(entity))
+        }
+    };
+}
+
+/// Generates a DELETE handler with Datastar fragment re-rendering support.
+///
+/// # Arguments
+/// * `$fn_name` - Name of the generated handler function
+/// * `$id_type` - Type of the ID path parameter (e.g., `RoasterId`)
+/// * `$sort_key` - Sort key type for list requests (e.g., `RoasterSortKey`)
+/// * `$repo_field` - Name of the repository field on `AppState` (e.g., `roaster_repo`)
+/// * `$render_fragment` - Path to the fragment render function
+///
+/// # Example
+/// ```ignore
+/// define_delete_handler!(
+///     delete_roaster,
+///     RoasterId,
+///     RoasterSortKey,
+///     roaster_repo,
+///     render_roaster_list_fragment
+/// );
+/// ```
+macro_rules! define_delete_handler {
+    ($fn_name:ident, $id_type:ty, $sort_key:ty, $repo_field:ident, $render_fragment:path) => {
+        #[tracing::instrument(skip(state, _auth_user, headers, query))]
+        pub(crate) async fn $fn_name(
+            axum::extract::State(state): axum::extract::State<crate::application::server::AppState>,
+            _auth_user: crate::application::auth::AuthenticatedUser,
+            headers: axum::http::HeaderMap,
+            axum::extract::Path(id): axum::extract::Path<$id_type>,
+            axum::extract::Query(query): axum::extract::Query<
+                crate::application::routes::support::ListQuery,
+            >,
+        ) -> Result<axum::response::Response, crate::application::errors::ApiError> {
+            let request = query.into_request::<$sort_key>();
+            state
+                .$repo_field
+                .delete(id)
+                .await
+                .map_err(crate::application::errors::AppError::from)?;
+
+            if crate::application::routes::support::is_datastar_request(&headers) {
+                $render_fragment(state, request, true)
+                    .await
+                    .map_err(crate::application::errors::ApiError::from)
+            } else {
+                Ok(axum::http::StatusCode::NO_CONTENT.into_response())
+            }
+        }
+    };
+}
+
+pub(super) use define_delete_handler;
+pub(super) use define_get_handler;

src/application/routes/mod.rs

@@ -1,5 +1,6 @@
 pub mod auth;
 pub mod bags;
+mod macros;
 pub mod roasters;
 pub mod roasts;
 pub mod support;

src/application/routes/roasters.rs

@@ -3,6 +3,7 @@ use axum::extract::{Path, Query, State};
 use axum::http::{HeaderMap, StatusCode};
 use axum::response::{Html, IntoResponse, Redirect, Response};
 
+use super::macros::{define_delete_handler, define_get_handler};
 use crate::application::auth::AuthenticatedUser;
 use crate::application::errors::{ApiError, AppError, map_app_error};
 use crate::application::routes::render_html;
@@ -148,14 +149,7 @@ pub(crate) async fn create_roaster(
     }
 }
 
-#[tracing::instrument(skip(state))]
-pub(crate) async fn get_roaster(
-    State(state): State<AppState>,
-    Path(id): Path<RoasterId>,
-) -> Result<Json<Roaster>, ApiError> {
-    let roaster = state.roaster_repo.get(id).await.map_err(AppError::from)?;
-    Ok(Json(roaster))
-}
+define_get_handler!(get_roaster, RoasterId, Roaster, roaster_repo);
 
 #[tracing::instrument(skip(state, _auth_user))]
 pub(crate) async fn update_roaster(
@@ -182,29 +176,13 @@ pub(crate) async fn update_roaster(
     Ok(Json(roaster))
 }
 
-#[tracing::instrument(skip(state, _auth_user, headers, query))]
-pub(crate) async fn delete_roaster(
-    State(state): State<AppState>,
-    _auth_user: AuthenticatedUser,
-    headers: HeaderMap,
-    Path(id): Path<RoasterId>,
-    Query(query): Query<ListQuery>,
-) -> Result<Response, ApiError> {
-    let request = query.into_request::<RoasterSortKey>();
-    state
-        .roaster_repo
-        .delete(id)
-        .await
-        .map_err(AppError::from)?;
-
-    if is_datastar_request(&headers) {
-        render_roaster_list_fragment(state, request, true)
-            .await
-            .map_err(ApiError::from)
-    } else {
-        Ok(StatusCode::NO_CONTENT.into_response())
-    }
-}
+define_delete_handler!(
+    delete_roaster,
+    RoasterId,
+    RoasterSortKey,
+    roaster_repo,
+    render_roaster_list_fragment
+);
 
 async fn render_roaster_list_fragment(
     state: AppState,

src/application/routes/roasts.rs

@@ -4,6 +4,7 @@ use axum::http::{HeaderMap, StatusCode};
 use axum::response::{Html, IntoResponse, Redirect, Response};
 use serde::Deserialize;
 
+use super::macros::{define_delete_handler, define_get_handler};
 use crate::application::auth::AuthenticatedUser;
 use crate::application::errors::{ApiError, AppError, map_app_error};
 use crate::application::routes::render_html;
@@ -205,34 +206,15 @@ pub(crate) async fn list_roasts(
     }
 }
 
-#[tracing::instrument(skip(state))]
-pub(crate) async fn get_roast(
-    State(state): State<AppState>,
-    Path(id): Path<RoastId>,
-) -> Result<Json<Roast>, ApiError> {
-    let roast = state.roast_repo.get(id).await.map_err(AppError::from)?;
-    Ok(Json(roast))
-}
+define_get_handler!(get_roast, RoastId, Roast, roast_repo);
 
-#[tracing::instrument(skip(state, _auth_user, headers, query))]
-pub(crate) async fn delete_roast(
-    State(state): State<AppState>,
-    _auth_user: AuthenticatedUser,
-    headers: HeaderMap,
-    Path(id): Path<RoastId>,
-    Query(query): Query<ListQuery>,
-) -> Result<Response, ApiError> {
-    let request = query.into_request::<RoastSortKey>();
-    state.roast_repo.delete(id).await.map_err(AppError::from)?;
-
-    if is_datastar_request(&headers) {
-        render_roast_list_fragment(state, request, true)
-            .await
-            .map_err(ApiError::from)
-    } else {
-        Ok(StatusCode::NO_CONTENT.into_response())
-    }
-}
+define_delete_handler!(
+    delete_roast,
+    RoastId,
+    RoastSortKey,
+    roast_repo,
+    render_roast_list_fragment
+);
 
 #[derive(Debug, Deserialize)]
 pub struct RoastsQuery {