CLAUDE.md

@@ -507,6 +507,10 @@ GET  /enhance/templates
 POST /enhance  {"path","template","prompt"?,"reference_path"?,"library"?}  -> job
 GET  /enhance/jobs/{id}              -> job
 GET  /enhance/jobs?path=&library=    -> {"jobs": [job, ...]}  newest first, discarded hidden
+GET  /enhance/prompts?templates=a,b&limit=10  (templates optional = all; limit 1..50, default 10)
+  -> {"prompts": [{"prompt","template","last_used","uses"}]}  distinct trimmed prompts, newest
+     use first; template/last_used from the newest job; discarded + failed jobs count;
+     DB only (no library scope, answers even when ComfyUI is down or Enhance is off)
 GET  /enhance/jobs/{id}/preview/{n}  -> the staged PNG (relayed from ComfyUI /view)
 POST /enhance/jobs/{id}/approve {"n"} -> a /image/versions `versions[]` entry
 POST /enhance/jobs/{id}/discard      -> job (hidden from the list; ComfyUI untouched)

src/database/enhance_dao.rs

@@ -68,6 +68,21 @@ const COLUMNS: &str = "id, original_hash, library_id, rel_path, template, prompt
      reference_path, comfy_prompt_id, status, error, queue_position, pending, saved, \
      discarded, created_at, updated_at, run_ms";
 
+/// One distinct prompt used across jobs, newest use first.
+#[derive(Debug, Clone, PartialEq, Eq, QueryableByName)]
+pub struct RecentPrompt {
+    #[diesel(sql_type = Text)]
+    pub prompt: String,
+    /// Template of the newest job that used this prompt.
+    #[diesel(sql_type = Text)]
+    pub template: String,
+    /// `created_at` of the newest job that used it.
+    #[diesel(sql_type = BigInt)]
+    pub last_used: i64,
+    #[diesel(sql_type = BigInt)]
+    pub uses: i64,
+}
+
 /// What the poller / approve changes on an existing job.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct JobUpdate {
@@ -107,6 +122,14 @@ pub trait EnhanceJobDao: Sync + Send {
     /// Jobs the poller still has to advance (`queued` / `running`).
     fn list_active(&mut self) -> Result<Vec<EnhanceJobRow>, DbError>;
     fn update(&mut self, id: &str, update: &JobUpdate) -> Result<(), DbError>;
+    /// Distinct non-empty prompts (compared trimmed), newest use first.
+    /// Counts every job, discarded and failed included. `templates` limits
+    /// to those template names; `None` means all.
+    fn recent_prompts(
+        &mut self,
+        templates: Option<&[String]>,
+        limit: i64,
+    ) -> Result<Vec<RecentPrompt>, DbError>;
     /// Hide a job from `list_for_hash`.
     fn discard(&mut self, id: &str) -> Result<(), DbError>;
     /// Delete jobs last touched before `cutoff` (unix seconds) that are not
@@ -238,6 +261,36 @@ impl EnhanceJobDao for SqliteEnhanceJobDao {
         .map_err(|e| DbError::log(DbErrorKind::UpdateError, e))
     }
 
+    fn recent_prompts(
+        &mut self,
+        templates: Option<&[String]>,
+        limit: i64,
+    ) -> Result<Vec<RecentPrompt>, DbError> {
+        trace_db_call("query", "enhance_job_recent_prompts", |_span| {
+            let mut conn = self.connection.lock().expect("Unable to get EnhanceJobDao");
+            let names = serde_json::to_string(templates.unwrap_or(&[]))
+                .map_err(|e| anyhow::anyhow!("Encode error: {}", e))?;
+            // `template` and `MAX(created_at)` are bare/aggregate in the same
+            // group, so SQLite takes `template` from the newest row.
+            sql_query(
+                "SELECT TRIM(prompt, ' ' || char(9) || char(10) || char(13)) AS prompt, \
+                        template, MAX(created_at) AS last_used, COUNT(*) AS uses \
+                 FROM enhance_jobs \
+                 WHERE prompt IS NOT NULL \
+                   AND TRIM(prompt, ' ' || char(9) || char(10) || char(13)) <> '' \
+                   AND (? = 0 OR template IN (SELECT value FROM json_each(?))) \
+                 GROUP BY TRIM(prompt, ' ' || char(9) || char(10) || char(13)) \
+                 ORDER BY last_used DESC, MAX(rowid) DESC LIMIT ?",
+            )
+            .bind::<Integer, _>(i32::from(templates.is_some()))
+            .bind::<Text, _>(names)
+            .bind::<BigInt, _>(limit)
+            .load::<RecentPrompt>(&mut *conn)
+            .map_err(|e| anyhow::anyhow!("Query error: {}", e))
+        })
+        .map_err(|e| DbError::log(DbErrorKind::QueryError, e))
+    }
+
     fn discard(&mut self, id: &str) -> Result<(), DbError> {
         trace_db_call("update", "enhance_job_discard", |_span| {
             let mut conn = self.connection.lock().expect("Unable to get EnhanceJobDao");
@@ -358,4 +411,59 @@ mod tests {
         assert!(d.get("c").unwrap().is_some());
         assert!(d.get("b").unwrap().is_none());
     }
+
+    fn prompt_job(id: &str, template: &str, prompt: Option<&str>, created: i64) -> EnhanceJobRow {
+        EnhanceJobRow {
+            template: template.into(),
+            prompt: prompt.map(str::to_string),
+            ..job(id, "h", "ready", created)
+        }
+    }
+
+    #[test]
+    fn recent_prompts_groups_trimmed_newest_first() {
+        let mut d = dao();
+        d.insert(&prompt_job("a", "edit", Some("warmer"), 100))
+            .unwrap();
+        d.insert(&prompt_job("b", "edit-fast", Some("  warmer\n"), 300))
+            .unwrap();
+        d.insert(&prompt_job("c", "edit", Some("remove the sign"), 200))
+            .unwrap();
+        d.insert(&prompt_job("d", "edit", Some("   "), 400))
+            .unwrap();
+        d.insert(&prompt_job("e", "edit", None, 500)).unwrap();
+        d.insert(&prompt_job("f", "restore", Some("older"), 50))
+            .unwrap();
+        // Failed and discarded jobs still count.
+        d.update("b", &JobUpdate::status("failed")).unwrap();
+        d.discard("a").unwrap();
+
+        let all = d.recent_prompts(None, 10).unwrap();
+        let view: Vec<_> = all
+            .iter()
+            .map(|p| (p.prompt.as_str(), p.template.as_str(), p.last_used, p.uses))
+            .collect();
+        assert_eq!(
+            view,
+            [
+                ("warmer", "edit-fast", 300, 2),
+                ("remove the sign", "edit", 200, 1),
+                ("older", "restore", 50, 1),
+            ]
+        );
+
+        let edit = d
+            .recent_prompts(Some(&["edit".into(), "nope".into()]), 10)
+            .unwrap();
+        let view: Vec<_> = edit.iter().map(|p| (p.prompt.as_str(), p.uses)).collect();
+        assert_eq!(view, [("remove the sign", 1), ("warmer", 1)]);
+
+        assert!(
+            d.recent_prompts(Some(&["nope".into()]), 10)
+                .unwrap()
+                .is_empty()
+        );
+        assert!(d.recent_prompts(Some(&[]), 10).unwrap().is_empty());
+        assert_eq!(d.recent_prompts(None, 1).unwrap().len(), 1);
+    }
 }

src/enhance/handlers.rs

@@ -3,6 +3,7 @@
 //!
 //! - `GET  /enhance/templates`
 //! - `POST /enhance`
+//! - `GET  /enhance/prompts?templates=&limit=`
 //! - `GET  /enhance/jobs?path=`
 //! - `GET  /enhance/jobs/{id}`
 //! - `GET  /enhance/jobs/{id}/preview/{n}`
@@ -363,6 +364,57 @@ pub async fn list_jobs(
     }
 }
 
+#[derive(Debug, Deserialize)]
+pub struct PromptsQuery {
+    /// Comma-separated template names; omitted = all templates.
+    pub templates: Option<String>,
+    pub limit: Option<i64>,
+}
+
+#[derive(Debug, Serialize)]
+struct PromptView {
+    prompt: String,
+    template: String,
+    last_used: i64,
+    uses: i64,
+}
+
+/// Prompts used before, newest first, so the app can offer them again for a
+/// series of similar photos. DB only: not library-scoped, and answered even
+/// when ComfyUI is down or Enhance is off (then simply from old rows).
+#[get("/enhance/prompts")]
+pub async fn recent_prompts(
+    _: Claims,
+    q: web::Query<PromptsQuery>,
+    svc: web::Data<EnhanceService>,
+) -> impl Responder {
+    let names: Option<Vec<String>> = q.templates.as_deref().map(|t| {
+        t.split(',')
+            .map(str::trim)
+            .filter(|n| !n.is_empty())
+            .map(str::to_string)
+            .collect()
+    });
+    // `templates=` with nothing in it means "no filter", like omitting it.
+    let names = names.filter(|n| !n.is_empty());
+    let limit = q.limit.unwrap_or(10).clamp(1, 50);
+    match svc.recent_prompts(names.as_deref(), limit) {
+        Ok(rows) => {
+            let prompts: Vec<PromptView> = rows
+                .into_iter()
+                .map(|r| PromptView {
+                    prompt: r.prompt,
+                    template: r.template,
+                    last_used: r.last_used,
+                    uses: r.uses,
+                })
+                .collect();
+            HttpResponse::Ok().json(json!({ "prompts": prompts }))
+        }
+        Err(e) => error_response(&e),
+    }
+}
+
 #[get("/enhance/jobs/{id}/preview/{n}")]
 pub async fn preview(
     _: Claims,

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": []})));
+}

src/enhance/mod.rs

@@ -21,5 +21,7 @@ pub mod template;
 #[cfg(test)]
 mod integration_tests;
 
-pub use handlers::{approve, discard, get_job, get_templates, list_jobs, preview, submit};
+pub use handlers::{
+    approve, discard, get_job, get_templates, list_jobs, preview, recent_prompts, submit,
+};
 pub use service::EnhanceService;

src/enhance/service.rs

@@ -18,8 +18,8 @@ use super::config::{EnhanceConfig, Loaded, PromptMode};
 use super::path_map::PathMap;
 use super::template::Template;
 use crate::database::enhance_dao::{
-    EnhanceJobDao, EnhanceJobRow, JobUpdate, STATUS_APPROVED, STATUS_EXPIRED, STATUS_FAILED,
-    STATUS_QUEUED, STATUS_READY, STATUS_RUNNING, STATUS_UNAVAILABLE,
+    EnhanceJobDao, EnhanceJobRow, JobUpdate, RecentPrompt, STATUS_APPROVED, STATUS_EXPIRED,
+    STATUS_FAILED, STATUS_QUEUED, STATUS_READY, STATUS_RUNNING, STATUS_UNAVAILABLE,
 };
 
 /// Short timeout for the `available` probe, so the templates call stays snappy
@@ -392,6 +392,19 @@ impl EnhanceService {
             .map_err(|e| EnhanceError::Internal(e.to_string()))
     }
 
+    /// Distinct recent prompts; DB only, so it works with ComfyUI down.
+    pub fn recent_prompts(
+        &self,
+        templates: Option<&[String]>,
+        limit: i64,
+    ) -> Result<Vec<RecentPrompt>, EnhanceError> {
+        self.dao
+            .lock()
+            .unwrap()
+            .recent_prompts(templates, limit)
+            .map_err(|e| EnhanceError::Internal(e.to_string()))
+    }
+
     /// Hide a job from the per-photo list. Nothing is deleted on ComfyUI:
     /// staged results vanish on its restart anyway.
     pub fn discard(&self, id: &str) -> Result<EnhanceJobRow, EnhanceError> {

src/main.rs

@@ -344,6 +344,7 @@ fn main() -> std::io::Result<()> {
                 .service(enhance::get_templates)
                 .service(enhance::submit)
                 .service(enhance::list_jobs)
+                .service(enhance::recent_prompts)
                 .service(enhance::get_job)
                 .service(enhance::preview)
                 .service(enhance::approve)