watchlist add: event only if inserted; adr 0015 jetstream/relay accuracy; drop vacuous assert

crates/adapters/sqlite/src/repositories/watchlist/mod.rs

@@ -39,7 +39,7 @@ impl WatchlistRepository for SqliteWatchlistRepository {
             .begin()
             .await
             .map_err(crate::shared::map_sqlx_error)?;
-        sqlx::query(
+        let inserted = sqlx::query(
             "INSERT OR IGNORE INTO watchlist_entries (id, user_id, movie_id, added_at) \
              VALUES (?, ?, ?, ?)",
         )
@@ -49,8 +49,13 @@ impl WatchlistRepository for SqliteWatchlistRepository {
         .bind(&added_at)
         .execute(&mut *tx)
         .await
-        .map_err(crate::shared::map_sqlx_error)?;
-        enqueue_events(&mut tx, events).await?;
+        .map_err(crate::shared::map_sqlx_error)?
+        .rows_affected()
+            > 0;
+        // A repeat add changed nothing, so it announces nothing.
+        if inserted {
+            enqueue_events(&mut tx, events).await?;
+        }
         tx.commit().await.map_err(crate::shared::map_sqlx_error)
     }