fix: add API job poller to process scheduler-created metadata jobs

The scheduler (indexer) created metadata_refresh/metadata_batch jobs in DB,
but the indexer excluded them (API_ONLY_JOB_TYPES) and the API only processed
jobs created via its REST endpoints. Scheduler-created jobs stayed pending forever.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/job_poller.rs

@@ -0,0 +1,134 @@
+use std::time::Duration;
+
+use sqlx::{PgPool, Row};
+use tracing::{error, info, trace};
+use uuid::Uuid;
+
+use crate::{metadata_batch, metadata_refresh};
+
+/// Poll for pending API-only jobs (`metadata_batch`, `metadata_refresh`) and process them.
+/// This mirrors the indexer's worker loop but for job types handled by the API.
+pub async fn run_job_poller(pool: PgPool, interval_seconds: u64) {
+    let wait = Duration::from_secs(interval_seconds.max(1));
+
+    loop {
+        match claim_next_api_job(&pool).await {
+            Ok(Some((job_id, job_type, library_id))) => {
+                info!("[JOB_POLLER] Claimed {job_type} job {job_id} library={library_id}");
+
+                let pool_clone = pool.clone();
+                let library_name: Option<String> =
+                    sqlx::query_scalar("SELECT name FROM libraries WHERE id = $1")
+                        .bind(library_id)
+                        .fetch_optional(&pool)
+                        .await
+                        .ok()
+                        .flatten();
+
+                tokio::spawn(async move {
+                    let result = match job_type.as_str() {
+                        "metadata_refresh" => {
+                            metadata_refresh::process_metadata_refresh(
+                                &pool_clone,
+                                job_id,
+                                library_id,
+                            )
+                            .await
+                        }
+                        "metadata_batch" => {
+                            metadata_batch::process_metadata_batch(
+                                &pool_clone,
+                                job_id,
+                                library_id,
+                            )
+                            .await
+                        }
+                        _ => Err(format!("Unknown API job type: {job_type}")),
+                    };
+
+                    if let Err(e) = result {
+                        error!("[JOB_POLLER] {job_type} job {job_id} failed: {e}");
+                        let _ = sqlx::query(
+                            "UPDATE index_jobs SET status = 'failed', error_opt = $2, finished_at = NOW() WHERE id = $1",
+                        )
+                        .bind(job_id)
+                        .bind(e.to_string())
+                        .execute(&pool_clone)
+                        .await;
+
+                        match job_type.as_str() {
+                            "metadata_refresh" => {
+                                notifications::notify(
+                                    pool_clone,
+                                    notifications::NotificationEvent::MetadataRefreshFailed {
+                                        library_name,
+                                        error: e.to_string(),
+                                    },
+                                );
+                            }
+                            "metadata_batch" => {
+                                notifications::notify(
+                                    pool_clone,
+                                    notifications::NotificationEvent::MetadataBatchFailed {
+                                        library_name,
+                                        error: e.to_string(),
+                                    },
+                                );
+                            }
+                            _ => {}
+                        }
+                    }
+                });
+            }
+            Ok(None) => {
+                trace!("[JOB_POLLER] No pending API jobs, waiting...");
+                tokio::time::sleep(wait).await;
+            }
+            Err(err) => {
+                error!("[JOB_POLLER] Error claiming job: {err}");
+                tokio::time::sleep(wait).await;
+            }
+        }
+    }
+}
+
+const API_JOB_TYPES: &[&str] = &["metadata_batch", "metadata_refresh"];
+
+async fn claim_next_api_job(pool: &PgPool) -> Result<Option<(Uuid, String, Uuid)>, sqlx::Error> {
+    let mut tx = pool.begin().await?;
+
+    let row = sqlx::query(
+        r#"
+        SELECT id, type, library_id
+        FROM index_jobs
+        WHERE status = 'pending'
+          AND type = ANY($1)
+          AND library_id IS NOT NULL
+        ORDER BY created_at ASC
+        FOR UPDATE SKIP LOCKED
+        LIMIT 1
+        "#,
+    )
+    .bind(API_JOB_TYPES)
+    .fetch_optional(&mut *tx)
+    .await?;
+
+    let Some(row) = row else {
+        tx.commit().await?;
+        return Ok(None);
+    };
+
+    let id: Uuid = row.get("id");
+    let job_type: String = row.get("type");
+    let library_id: Uuid = row.get("library_id");
+
+    sqlx::query(
+        "UPDATE index_jobs SET status = 'running', started_at = NOW(), error_opt = NULL WHERE id = $1",
+    )
+    .bind(id)
+    .execute(&mut *tx)
+    .await?;
+
+    tx.commit().await?;
+    Ok(Some((id, job_type, library_id)))
+}