feat(meta): substitute TBA for unnamed episodes

crates/arr-daemon/src/series_refresh.rs

@@ -569,6 +569,7 @@ mod tests {
     use wiremock::{Mock, MockServer, ResponseTemplate};
 
     use super::*;
+    use arr_meta::UNTITLED_EPISODE;
 
     fn series_body(status: &str) -> serde_json::Value {
         json!({
@@ -1086,6 +1087,53 @@ mod tests {
         assert!(!vanished, "the conflict is over once TMDB lists it again");
     }
 
+    /// #153. TMDB has not named an unaired episode yet, so the refresh stores
+    /// the placeholder instead of an empty string — and #121's guarded update
+    /// swaps it for the real title once TMDB fills it in.
+    #[tokio::test]
+    async fn an_unnamed_episode_stores_the_placeholder_until_tmdb_names_it() {
+        let (_dir, database) = seeded_series(true).await;
+        let server = tmdb(
+            "Returning Series",
+            season_one_body(&json!([
+                {"episode_number": 1, "name": "Magic Xylophone", "air_date": "2018-10-01"},
+                {"episode_number": 2, "name": "", "air_date": null}
+            ])),
+        )
+        .await;
+
+        action(&server).tick(&database).await.unwrap();
+
+        let unnamed = season_one_episode(&database, 2).await;
+        let title: String = sqlx::query_scalar("SELECT title FROM episodes WHERE id = ?")
+            .bind(unnamed)
+            .fetch_one(database.pool())
+            .await
+            .unwrap();
+        assert_eq!(title, UNTITLED_EPISODE);
+
+        expire_refresh(&database).await;
+        server.reset().await;
+        mount(
+            &server,
+            "Returning Series",
+            season_one_body(&json!([
+                {"episode_number": 1, "name": "Magic Xylophone", "air_date": "2018-10-01"},
+                {"episode_number": 2, "name": "Hospital", "air_date": "2018-10-02"}
+            ])),
+        )
+        .await;
+
+        action(&server).tick(&database).await.unwrap();
+
+        let title: String = sqlx::query_scalar("SELECT title FROM episodes WHERE id = ?")
+            .bind(unnamed)
+            .fetch_one(database.pool())
+            .await
+            .unwrap();
+        assert_eq!(title, "Hospital");
+    }
+
     async fn season_two_episode(database: &Db) -> i64 {
         sqlx::query_scalar(
             "SELECT e.id FROM episodes e JOIN seasons s ON s.id = e.season_id