fix(api): search survives a down TMDB and errors name the upstream

crates/arr-api/src/movies.rs

@@ -159,7 +159,12 @@ pub enum ApiError {
     NoTrailer,
     Conflict(String),
     Invalid(String),
+    /// The SQLite handle is gone. Distinct from [`Self::Upstream`] so a
+    /// TMDB or Prowlarr fault never reads as a database fault (issue #168).
     Unavailable,
+    /// An upstream service could not be reached, is misconfigured or is
+    /// unconfigured. The payload names it.
+    Upstream(&'static str),
     Database(String),
     /// A library delete that could not touch the disk. Named separately from
     /// [`Self::Database`] because the row is still there and a retry is the
@@ -184,6 +189,10 @@ impl IntoResponse for ApiError {
                 StatusCode::SERVICE_UNAVAILABLE,
                 "database unavailable".into(),
             ),
+            Self::Upstream(name) => (
+                StatusCode::SERVICE_UNAVAILABLE,
+                format!("{name} unavailable"),
+            ),
             Self::Database(error) => {
                 tracing::error!(%error, "API database error");
                 (StatusCode::INTERNAL_SERVER_ERROR, "database error".into())
@@ -554,7 +563,7 @@ pub async fn search(
     }
     state
         .send_movie_command(MovieCommand::Search { movie_id: id })
-        .map_err(|_| ApiError::Unavailable)?;
+        .map_err(|_| ApiError::Upstream("daemon"))?;
     Ok((StatusCode::ACCEPTED, Json(Accepted { accepted: true })))
 }
 
@@ -671,7 +680,7 @@ pub async fn grab(
             movie_id,
             release_id,
         })
-        .map_err(|_| ApiError::Unavailable)?;
+        .map_err(|_| ApiError::Upstream("daemon"))?;
     Ok((StatusCode::ACCEPTED, Json(Accepted { accepted: true })))
 }