codex: preserve search filtering on db fallback

Co-authored-by: Codex <noreply@openai.com>

codex-rs/app-server/tests/suite/v2/thread_list.rs

@@ -605,6 +605,71 @@ sqlite = true
     Ok(())
 }
 
+#[tokio::test]
+async fn thread_list_keeps_empty_search_results_when_db_page_is_empty() -> Result<()> {
+    let codex_home = TempDir::new()?;
+    std::fs::write(
+        codex_home.path().join("config.toml"),
+        r#"
+model = "mock-model"
+approval_policy = "never"
+suppress_unstable_features_warning = true
+
+[features]
+sqlite = true
+"#,
+    )?;
+
+    create_fake_rollout(
+        codex_home.path(),
+        "2025-01-02T10-00-00",
+        "2025-01-02T10:00:00Z",
+        "match: needle",
+        Some("mock_provider"),
+        None,
+    )?;
+    create_fake_rollout(
+        codex_home.path(),
+        "2025-01-02T11-00-00",
+        "2025-01-02T11:00:00Z",
+        "no hit here",
+        Some("mock_provider"),
+        None,
+    )?;
+
+    let state_db =
+        codex_state::StateRuntime::init(codex_home.path().to_path_buf(), "mock_provider".into())
+            .await?;
+    state_db.mark_backfill_complete(None).await?;
+
+    let mut mcp = init_mcp(codex_home.path()).await?;
+    let request_id = mcp
+        .send_thread_list_request(codex_app_server_protocol::ThreadListParams {
+            cursor: None,
+            limit: Some(10),
+            sort_key: None,
+            model_providers: Some(vec!["mock_provider".to_string()]),
+            source_kinds: None,
+            archived: None,
+            cwd: None,
+            search_term: Some("absent".to_string()),
+        })
+        .await?;
+    let resp: JSONRPCResponse = timeout(
+        DEFAULT_READ_TIMEOUT,
+        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
+    )
+    .await??;
+    let ThreadListResponse {
+        data, next_cursor, ..
+    } = to_response::<ThreadListResponse>(resp)?;
+
+    assert_eq!(next_cursor, None);
+    assert!(data.is_empty());
+
+    Ok(())
+}
+
 #[tokio::test]
 async fn thread_list_empty_source_kinds_defaults_to_interactive_only() -> Result<()> {
     let codex_home = TempDir::new()?;

codex-rs/rollout/src/recorder.rs

@@ -287,7 +287,7 @@ impl RolloutRecorder {
         )
         .await
         {
-            if db_page.items.is_empty() && !fs_page.items.is_empty() {
+            if search_term.is_none() && db_page.items.is_empty() && !fs_page.items.is_empty() {
                 tracing::warn!(
                     "state db discrepancy during list_threads_with_db_fallback: empty_db_page"
                 );