Add GET /enhance/prompts: recent distinct Enhance prompts

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/enhance/integration_tests.rs

@@ -263,6 +263,7 @@ impl Fx {
                 .service(super::get_templates)
                 .service(super::submit)
                 .service(super::list_jobs)
+                .service(super::recent_prompts)
                 .service(super::get_job)
                 .service(super::preview)
                 .service(super::approve)
@@ -991,3 +992,62 @@ async fn busy_queue_blocks_the_free() {
     fx.svc.idle_check().await;
     assert_eq!(fx.mock.free_calls.load(Ordering::SeqCst), 0);
 }
+
+#[actix_rt::test]
+async fn recent_prompts_lists_distinct_trimmed_prompts_even_when_discarded() {
+    let fx = fx().await;
+    fx.put(PHOTO, b"photo");
+    let mut ids = Vec::new();
+    for prompt in ["warmer", " warmer ", "less grain"] {
+        let (st, job, _) = call(
+            &fx,
+            "POST",
+            "/enhance",
+            Some(json!({"path": PHOTO, "template": "restore", "prompt": prompt})),
+        )
+        .await;
+        assert_eq!(st, 200);
+        ids.push(job["id"].as_str().unwrap().to_string());
+    }
+    call(
+        &fx,
+        "POST",
+        &format!("/enhance/jobs/{}/discard", ids[0]),
+        None,
+    )
+    .await;
+
+    let (st, body, _) = call(&fx, "GET", "/enhance/prompts", None).await;
+    assert_eq!(st, 200);
+    let rows = body["prompts"].as_array().unwrap();
+    let texts: Vec<(&str, i64)> = rows
+        .iter()
+        .map(|r| (r["prompt"].as_str().unwrap(), r["uses"].as_i64().unwrap()))
+        .collect();
+    assert_eq!(texts.iter().map(|t| t.1).sum::<i64>(), 3);
+    assert!(texts.contains(&("warmer", 2)) && texts.contains(&("less grain", 1)));
+    assert_eq!(rows[0]["template"], "restore");
+    assert!(rows[0]["last_used"].as_i64().unwrap() > 0);
+
+    let (_, body, _) = call(&fx, "GET", "/enhance/prompts?templates=nope", None).await;
+    assert_eq!(body, json!({"prompts": []}));
+    let (_, body, _) = call(
+        &fx,
+        "GET",
+        "/enhance/prompts?templates=nope,restore&limit=0",
+        None,
+    )
+    .await;
+    assert_eq!(
+        body["prompts"].as_array().unwrap().len(),
+        1,
+        "limit clamps to 1"
+    );
+}
+
+#[actix_rt::test]
+async fn recent_prompts_answers_when_enhance_is_off() {
+    let fx = fx_with(None, |c| c.url = None).await;
+    let (st, body, _) = call(&fx, "GET", "/enhance/prompts", None).await;
+    assert_eq!((st, body), (200, json!({"prompts": []})));
+}