huskies: merge 889

server/src/crdt_state/write/tests.rs

@@ -733,3 +733,84 @@ async fn bug_511_rowid_replay_preserves_field_update_after_list_insert() {
         );
     }
 }
+
+// ── Story 889 regression tests ───────────────────────────────────────────────
+
+/// Regression for story 889: a tombstoned story must not be resurrected by
+/// concurrent write_item calls racing the delete.  Spawns a tokio task that
+/// hammers write_item every 10ms, tombstones the item mid-race, then verifies
+/// the projection stays empty for ~500ms and remains empty after the writer
+/// stops.
+///
+/// The tokio current_thread runtime keeps all tasks on the same OS thread, so
+/// the thread-local test CRDT is visible to the spawned task.
+#[tokio::test]
+async fn tombstone_survives_concurrent_writes() {
+    use std::sync::Arc;
+    use std::sync::atomic::{AtomicBool, Ordering};
+
+    use super::super::read::{evict_item, read_item};
+
+    init_for_test();
+
+    let story_id = "889_story_tombstone_concurrent";
+
+    write_item(
+        story_id,
+        "2_current",
+        Some("Tombstone Concurrent Test"),
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+        None,
+    );
+    assert!(
+        read_item(story_id).is_some(),
+        "item must exist before eviction"
+    );
+
+    let stop = Arc::new(AtomicBool::new(false));
+    let stop_clone = stop.clone();
+
+    let writer = tokio::task::spawn(async move {
+        while !stop_clone.load(Ordering::Relaxed) {
+            write_item(
+                story_id,
+                "2_current",
+                Some("Tombstone Concurrent Test"),
+                None,
+                None,
+                None,
+                None,
+                None,
+                None,
+                None,
+            );
+            tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
+        }
+    });
+
+    tokio::time::sleep(tokio::time::Duration::from_millis(30)).await;
+
+    evict_item(story_id).expect("evict_item must succeed");
+
+    let deadline = tokio::time::Instant::now() + tokio::time::Duration::from_millis(500);
+    while tokio::time::Instant::now() < deadline {
+        assert!(
+            read_item(story_id).is_none(),
+            "tombstoned story must not reappear while concurrent writes are in flight"
+        );
+        tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
+    }
+
+    stop.store(true, Ordering::Relaxed);
+    writer.await.unwrap();
+
+    assert!(
+        read_item(story_id).is_none(),
+        "tombstoned story must stay gone after concurrent writer stops"
+    );
+}