feat(api): expose seasons.vanished (#141)

Season objects from the series endpoints now carry the conflict flag
#137 writes, the way episodes already do.

crates/arr-api/src/series.rs

@@ -97,6 +97,10 @@ pub struct Season {
     pub number: i64,
     /// §4.1. Whether new episodes of this season arrive wanted.
     pub tracked: bool,
+    /// #141. The season vanished upstream while files remained under it,
+    /// which is why the row still exists. A conflict for the operator to
+    /// resolve; nothing was deleted from disk.
+    pub vanished: bool,
     pub episodes: Vec<Episode>,
 }
 
@@ -629,7 +633,7 @@ async fn remove_library_files(state: &AppState, id: i64) -> Result<(), ApiError>
 
 async fn load_seasons(state: &AppState, series_id: i64) -> Result<Vec<Season>, ApiError> {
     let seasons = sqlx::query!(
-        r#"SELECT id AS "id!: i64", series_id AS "series_id!: i64", number AS "number!: i64", tracked AS "tracked!: bool" FROM seasons WHERE series_id = ? ORDER BY number"#,
+        r#"SELECT id AS "id!: i64", series_id AS "series_id!: i64", number AS "number!: i64", tracked AS "tracked!: bool", vanished AS "vanished!: bool" FROM seasons WHERE series_id = ? ORDER BY number"#,
         series_id
     )
     .fetch_all(pool(state)?)
@@ -650,6 +654,7 @@ async fn load_seasons(state: &AppState, series_id: i64) -> Result<Vec<Season>, A
             series_id: season.series_id,
             number: season.number,
             tracked: season.tracked,
+            vanished: season.vanished,
             episodes: episodes
                 .iter()
                 .filter(|episode| episode.season_id == season.id)
@@ -1390,6 +1395,50 @@ mod tests {
         assert_eq!(season["number"], 1);
     }
 
+    #[tokio::test]
+    async fn a_vanished_season_reaches_the_seasons_endpoint() {
+        let (_dir, state, base) = application().await;
+        let root_id = tv_root(&state, "main").await;
+        let series = add_series(&base, root_id, false).await;
+        let series_id = series["id"].as_i64().expect("id");
+        let clean = add_season(
+            &base,
+            series_id,
+            1,
+            serde_json::json!([{"number": 1, "title": "One"}]),
+        )
+        .await;
+        assert_eq!(clean["vanished"], false);
+        add_season(
+            &base,
+            series_id,
+            2,
+            serde_json::json!([{"number": 1, "title": "One"}]),
+        )
+        .await;
+
+        sqlx::query("UPDATE seasons SET vanished = 1 WHERE series_id = ? AND number = 2")
+            .bind(series_id)
+            .execute(state.database().expect("database").pool())
+            .await
+            .expect("flag season vanished");
+
+        let seasons: serde_json::Value = reqwest::Client::new()
+            .get(format!("{base}/api/series/{series_id}/seasons"))
+            .send()
+            .await
+            .expect("list seasons")
+            .json()
+            .await
+            .expect("seasons json");
+        let seasons = seasons.as_array().expect("seasons array");
+        assert_eq!(seasons[0]["vanished"], false);
+        assert_eq!(
+            seasons[1]["vanished"], true,
+            "#141: the conflict flag is not stopped at the database"
+        );
+    }
+
     #[tokio::test]
     async fn intent_is_set_on_seasons_and_on_single_episodes() {
         let (_dir, state, base) = application().await;