Search: find addresses by local part, domain or name on PostgreSQL and MySQL

A 3-node PostgreSQL rehearsal found IMAP SEARCH FROM "noreply" matched
0-2 messages where RocksDB matched 23 of 930. The message indexer hands
each address and display name of From/To/Cc/Bcc to the search store as
keyword text (Language::None). The built-in index splits keyword text
into lowercase runs of alphanumerics, so an address is found by its full
form, its local part, its domain or a display-name word. The SQL
backends didn't:

- PostgreSQL's text parser keeps "[email protected]" as one email
  token (host names and URLs likewise), so neither "noreply" nor
  "amazon.com" ever matched it. Keyword text is now split the same way
  as the built-in index (SpaceTokenizer) before to_tsvector on insert
  and before plainto_tsquery/phraseto_tsquery on search, still under
  the 'simple' configuration, so the GIN index keeps serving the query.
  The sort columns keep the raw text.
- MySQL's FULLTEXT parser already splits on punctuation, but InnoDB
  never indexes its stopwords ("com", "de", "www", ...) or words under
  innodb_ft_min_token_size (3), and a required +word it hasn't indexed
  matches no row. So "amazon.com", "[email protected]" or "jane doe" found
  nothing. Those words are now matched with a word-boundary REGEXP on
  the rows the indexed words select. In language text (bodies,
  subjects) they are dropped when other words remain, and only checked
  when nothing else is left, so "the invoice" no longer finds nothing
  either.

Existing PostgreSQL search indexes hold the old single-token vectors and
need a reindex (the reindexAccounts task) before address searches find
old messages. MySQL needs none: only the query changed.

store::search_tests gains test_address_search: five messages, 28
FROM/TO/CC/BCC searches by full address, local part, domain, domain
labels, display name and hyphenated local part, plus a TEXT-style OR,
with the same expected ids on every backend. It passes on RocksDB,
SQLite, PostgreSQL and MySQL; on main it fails on PostgreSQL (From
"noreply") and MySQL (From "[email protected]").

.gitea/workflows/publish.yml

@@ -3,11 +3,28 @@
 # whether a person pushed it or weekly-release.yml created it through the
 # releases API.
 #
-# The image is multi-arch (linux/amd64, linux/arm64) as before, but built in
-# one buildx run on host1 instead of one native runner per architecture: the
-# Dockerfile's builder stage runs on the build platform and cross-compiles
-# with an aarch64 linker, so only the small final stage (apt, setcap) goes
-# through QEMU for arm64. No digest-joining job is needed.
+# The image is multi-arch (linux/amd64, linux/arm64), built by two jobs on
+# the image-build runner rather than one buildx run for both. The Dockerfile's
+# builder stage runs on the build platform and cross-compiles with an aarch64
+# linker, so only the small final stage (apt, setcap) goes through QEMU for
+# arm64 -- but two release builds (LTO, one codegen unit) side by side on one
+# machine each take twice as long. Production runs amd64, so amd64 goes first
+# and on its own:
+#   * publish-amd64 pushes :<version>-amd64 and :<version>, a plain amd64
+#     image, as soon as its build is done. A deploy can start from it.
+#   * publish-arm64 then builds arm64, pushes :<version>-arm64, and replaces
+#     :<version> with the two-platform index. :latest moves only here, so it
+#     never names an image without arm64.
+#
+# Both jobs use one BuildKit builder, `gitea-builder`, whose container
+# (buildx_buildkit_gitea-builder0) and state volume stay on the runner's host
+# between jobs: a job container's `buildx create` finds the existing container
+# and reuses it and its cache. The dependency build (`cargo chef cook`) is
+# keyed on the recipe, which only a dependency change alters, so a release
+# normally compiles just the workspace. Removing that container or its volume
+# costs the next release a cold build, nothing more. The planner and dependency
+# layers for the build platform are shared, so arm64 also reuses what amd64
+# just did where it can.
 #
 # Two guards before anything is pushed:
 #   * the tag must be v<brand_version!>. The version is a string in
@@ -62,7 +79,7 @@ jobs:
           echo "version=$V" >> "$GITHUB_OUTPUT"
           echo "version $V"
 
-  publish:
+  publish-amd64:
     needs: [version]
     runs-on: docker
     container:
@@ -81,16 +98,15 @@ jobs:
           test -n "$REGISTRY" && test -n "$VERSION"
           test -n "$PACKAGE_TOKEN" || { echo "PACKAGE_TOKEN secret is not set on this repository" >&2; exit 1; }
           echo "$PACKAGE_TOKEN" | docker login -u jcoffey-dev --password-stdin "$REGISTRY"
-          docker run --privileged --rm tonistiigi/binfmt --install arm64
           docker buildx create --use --name gitea-builder --driver docker-container || docker buildx use gitea-builder
-      # Attestations off, as before: they add manifests of their own to the
-      # index, and the index should hold the two images and nothing else.
+      # Attestations off, as before: they add manifests of their own, and the
+      # index should hold the two images and nothing else.
       - run: |
           docker buildx build \
-            --platform linux/amd64,linux/arm64 \
+            --platform linux/amd64 \
             --provenance=false --sbom=false \
+            --tag "$IMAGE:$VERSION-amd64" \
             --tag "$IMAGE:$VERSION" \
-            --tag "$IMAGE:latest" \
             --push .
           docker buildx imagetools inspect "$IMAGE:$VERSION"
       # Gitea keeps a container package on its owner; linking it shows it on
@@ -103,11 +119,47 @@ jobs:
       - if: always()
         run: docker logout "$REGISTRY" || true
 
+  publish-arm64:
+    needs: [version, publish-amd64]
+    runs-on: docker
+    container:
+      image: docker:28-cli@sha256:625d9431a9f54c5a2bc90f24f0e1c3d55b1349fd857dd85035f98c2c9acbdd4d # 28-cli
+      volumes:
+        - /var/run/docker.sock:/var/run/docker.sock
+    env:
+      DOCKER_BUILDKIT: "1"
+      REGISTRY: ${{ vars.REGISTRY }}
+      IMAGE: ${{ vars.REGISTRY }}/${{ github.repository }}
+      VERSION: ${{ needs.version.outputs.version }}
+      PACKAGE_TOKEN: ${{ secrets.PACKAGE_TOKEN }}
+    steps:
+      - uses: coffey-labs/actions/checkout@fab0c4d45e0162963965f1555df27b7bed5e20ec
+      - run: |
+          echo "$PACKAGE_TOKEN" | docker login -u jcoffey-dev --password-stdin "$REGISTRY"
+          docker run --privileged --rm tonistiigi/binfmt --install arm64
+          docker buildx create --use --name gitea-builder --driver docker-container || docker buildx use gitea-builder
+      # The index is built from the two per-architecture tags rather than from
+      # :<version>, which by now is the amd64 image and would be read as such.
+      - run: |
+          docker buildx build \
+            --platform linux/arm64 \
+            --provenance=false --sbom=false \
+            --tag "$IMAGE:$VERSION-arm64" \
+            --push .
+          docker buildx imagetools create \
+            --tag "$IMAGE:$VERSION" \
+            --tag "$IMAGE:latest" \
+            "$IMAGE:$VERSION-amd64" "$IMAGE:$VERSION-arm64"
+          docker buildx imagetools inspect "$IMAGE:$VERSION"
+      - if: always()
+        run: docker logout "$REGISTRY" || true
+
   # The weekly release creates its Release (and so the tag) first; a tag
   # pushed by hand has none. Either way the tag ends up with exactly one
-  # Release, created after the image exists so its pull instructions work.
+  # Release, created once the amd64 image exists so its pull instructions
+  # work; arm64 and the binaries follow.
   release:
-    needs: [version, publish]
+    needs: [version, publish-amd64]
     runs-on: light
     container:
       image: python:3.13-slim@sha256:8d9d0b8bcf6506481eae4907c18f5e3e7902e629f5f6d684f9e7c32e85e3ddf0 # 3.13-slim
@@ -131,7 +183,9 @@ jobs:
           except urllib.error.HTTPError as e:
               if e.code != 404: raise
           image = f"{os.environ['REGISTRY']}/{os.environ['REPO']}:{version}"
-          body = (f"Container image: `{image}` (linux/amd64, linux/arm64); also `:latest`.\n\n"
+          body = (f"Container image: `{image}` (linux/amd64, linux/arm64); also `:latest`. "
+                  "amd64 is published first; arm64 is added to the same tag when its build "
+                  "finishes, and `:latest` moves then.\n\n"
                   "Binaries for a host install are attached: `inbuxa-linux-amd64.tar.gz` and "
                   "`inbuxa-linux-arm64.tar.gz`, with `SHA256SUMS`. Each is the binary out of this "
                   "release's image for that architecture, so it is the same build. The image "
@@ -154,7 +208,7 @@ jobs:
   # `docker create` does not start anything, so pulling an arm64 image on an
   # amd64 runner and copying a file out of it needs no emulation.
   binaries:
-    needs: [version, publish, release]
+    needs: [version, publish-arm64, release]
     runs-on: docker
     container:
       image: docker:28-cli@sha256:625d9431a9f54c5a2bc90f24f0e1c3d55b1349fd857dd85035f98c2c9acbdd4d # 28-cli

crates/common/src/ipc.rs

@@ -335,3 +335,57 @@ impl EmailPush {
         }
     }
 }
+
+/// inbuxa: the task locks this node holds, so a graceful stop can hand them
+/// back instead of leaving the tasks blocked until the locks expire.
+pub struct TaskLocks {
+    held: parking_lot::Mutex<ahash::AHashSet<u64>>,
+    stopping: AtomicBool,
+    expiry: std::sync::atomic::AtomicU64,
+}
+
+impl TaskLocks {
+    /// How long a task lock lasts, in seconds, unless it is released first.
+    pub const DEFAULT_EXPIRY: u64 = 60 * 60;
+
+    pub fn is_stopping(&self) -> bool {
+        self.stopping.load(Ordering::Acquire)
+    }
+
+    /// Stops new claims and returns the ids of every lock still held.
+    pub fn stop(&self) -> Vec<u64> {
+        self.stopping.store(true, Ordering::Release);
+        self.held.lock().drain().collect()
+    }
+
+    pub fn insert(&self, id: u64) {
+        self.held.lock().insert(id);
+    }
+
+    pub fn remove(&self, id: u64) {
+        self.held.lock().remove(&id);
+    }
+
+    pub fn held(&self) -> usize {
+        self.held.lock().len()
+    }
+
+    pub fn expiry(&self) -> u64 {
+        self.expiry.load(Ordering::Relaxed)
+    }
+
+    /// Changes the lock lifetime; the tests shorten it.
+    pub fn set_expiry(&self, seconds: u64) {
+        self.expiry.store(seconds.max(1), Ordering::Relaxed);
+    }
+}
+
+impl Default for TaskLocks {
+    fn default() -> Self {
+        Self {
+            held: Default::default(),
+            stopping: AtomicBool::new(false),
+            expiry: std::sync::atomic::AtomicU64::new(Self::DEFAULT_EXPIRY),
+        }
+    }
+}

crates/common/src/lib.rs

@@ -279,6 +279,8 @@ pub struct HttpAuthCache {
 pub struct Ipc {
     pub push_tx: mpsc::Sender<PushEvent>,
     pub task_tx: Arc<Notify>,
+    // inbuxa: task locks held by this node, released on a graceful stop
+    pub task_locks: Arc<crate::ipc::TaskLocks>,
     pub queue_tx: mpsc::Sender<QueueEvent>,
     pub report_tx: mpsc::Sender<ReportingEvent>,
     pub broadcast_tx: Option<mpsc::Sender<BroadcastEvent>>,

crates/common/src/manager/backup.rs

@@ -23,6 +23,13 @@ use utils::{UnwrapFailure, codec::leb128::Leb128_};
 
 pub(super) const MAGIC_MARKER: u8 = 123;
 
+// inbuxa: blobs kept under a fixed name instead of a content hash. Nothing
+// links to them, so the export names them outright.
+const NAMED_BLOBS: &[&[u8]] = &[
+    crate::manager::SPAM_CLASSIFIER_KEY,
+    crate::manager::SPAM_TRAINER_KEY,
+];
+
 #[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
 pub(super) enum Family {
     Data = 0,
@@ -143,15 +150,21 @@ impl Core {
                     .await
                     .failed("Failed to iterate over data store");
 
-                for hash in blobs {
+                // inbuxa: the trained spam classifier and its trainer state are
+                // blobs stored under fixed names with no blob link, so the walk
+                // over links above never reaches them.
+                let named = NAMED_BLOBS.iter().map(|key| key.to_vec());
+                for key in blobs
+                    .into_iter()
+                    .map(|hash| hash.as_slice().to_vec())
+                    .chain(named)
+                {
                     if let Some(blob) = blob_store
-                        .get_blob(hash.as_slice(), 0..usize::MAX)
+                        .get_blob(&key, 0..usize::MAX)
                         .await
                         .failed("Failed to get blob")
                     {
-                        writer
-                            .send((hash.as_slice().to_vec(), blob))
-                            .failed("Failed to send key");
+                        writer.send((key, blob)).failed("Failed to send key");
                     }
                 }
             }),
@@ -323,7 +336,13 @@ impl Family {
                 SUBSPACE_REGISTRY_IDX,
                 SUBSPACE_REGISTRY_PK,
                 SUBSPACE_DIRECTORY,
-                store::SUBSPACE_INBUXA, // inbuxa: masked email
+                // inbuxa: registry objects the upstream list left out, so an
+                // export dropped them: archived items (undelete) and spam
+                // training samples. Their indexes and id counters already
+                // travel in this family and in `data`, so they ride along.
+                SUBSPACE_DELETED_ITEMS,
+                SUBSPACE_SPAM_SAMPLES,
+                store::SUBSPACE_INBUXA, // inbuxa: the fork's own data (masked email, undelete, policies)
             ],
             Family::Changelog => &[SUBSPACE_LOGS],
             Family::Queue => &[SUBSPACE_QUEUE_MESSAGE, SUBSPACE_QUEUE_EVENT],

crates/common/src/manager/boot.rs

@@ -54,6 +54,13 @@ Options:
   -o, --console                    Open the store console
   -h, --help                       Print help
   -V, --version                    Print version
+
+An export holds everything in the data and blob stores except short-lived
+in-memory state (rate limits, locks, greylisting) and the full-text search
+index, which belongs to one search backend. An import into an empty store
+queues the index to be rebuilt when the server next starts. EXPORT_TYPES
+limits an export to some of: data, registry, blob, changelog, queue, report,
+telemetry, tasks.
 "#
 );
 
@@ -256,10 +263,10 @@ impl BootManager {
                 telemetry.enable();
 
                 // Parse settings and restore
-                Box::pin(Core::parse(&mut bootstrap, storage))
-                    .await
-                    .restore(path)
-                    .await;
+                let core = Box::pin(Core::parse(&mut bootstrap, storage)).await;
+                let imported = core.restore(path).await;
+                // inbuxa: the search index isn't exported; rebuild it
+                core.queue_reindex(&imported).await;
                 std::process::exit(0);
             }
             StoreOp::Console => {
@@ -290,6 +297,7 @@ pub fn build_ipc(has_pubsub: bool) -> (Ipc, IpcReceivers) {
             report_tx,
             broadcast_tx: has_pubsub.then_some(broadcast_tx),
             task_tx: Arc::new(Notify::new()),
+            task_locks: Arc::new(crate::ipc::TaskLocks::default()),
             train_task_controller: Arc::new(TrainTaskController::default()),
         },
         IpcReceivers {

crates/common/src/manager/restore.rs

@@ -9,15 +9,22 @@
 use super::backup::MAGIC_MARKER;
 use crate::{Core, DATABASE_SCHEMA_VERSION};
 use lz4_flex::frame::FrameDecoder;
-use registry::schema::enums::CompressionAlgo;
+use registry::{
+    schema::{
+        enums::{CompressionAlgo, TaskStoreMaintenanceType},
+        structs::{Task, TaskStatus, TaskStoreMaintenance},
+    },
+    types::EnumImpl,
+};
 use std::{
     fs::File,
     io::{BufReader, ErrorKind, Read},
     path::{Path, PathBuf},
 };
 use store::{
-    BlobStore, IterateParams, SUBSPACE_BLOBS, SUBSPACE_COUNTER, SUBSPACE_INDEXES, SUBSPACE_QUOTA,
-    SUBSPACE_REGISTRY_PK, Store, U32_LEN,
+    BlobStore, IterateParams, SUBSPACE_BLOBS, SUBSPACE_COUNTER, SUBSPACE_INDEXES,
+    SUBSPACE_PROPERTY, SUBSPACE_QUOTA, SUBSPACE_REGISTRY_PK, SUBSPACE_TELEMETRY_SPAN, Store,
+    U32_LEN,
     write::{
         AnyClass, AnyKey, BatchBuilder, ValueClass,
         key::{DeserializeBigEndian, is_node_id_key},
@@ -27,7 +34,9 @@ use types::{collection::Collection, field::Field};
 use utils::{UnwrapFailure, failed};
 
 impl Core {
-    pub async fn restore(&self, src: PathBuf) {
+    /// Imports an export into an empty store and returns the subspaces it
+    /// wrote. inbuxa: the caller hands them to [`Core::queue_reindex`].
+    pub async fn restore(&self, src: PathBuf) -> Vec<u8> {
         // Backup the core
         let paths = if src.is_dir() {
             let mut paths = Vec::new();
@@ -64,6 +73,13 @@ impl Core {
             std::process::exit(1);
         }
 
+        let mut imported = paths
+            .iter()
+            .map(|path| KeyValueReader::new(path).subspace)
+            .collect::<Vec<_>>();
+        imported.sort_unstable();
+        imported.dedup();
+
         let mut tasks = Vec::new();
         for path in paths {
             let storage = self.storage.clone();
@@ -76,6 +92,54 @@ impl Core {
         for task in tasks {
             task.await.failed("Failed to wait for task");
         }
+
+        imported
+    }
+
+    /// inbuxa: an export never carries the full-text index. It is built by
+    /// and for one search backend (the SQL stores index into their own
+    /// tables, the key-value stores into a subspace, external engines keep it
+    /// themselves), so it would be wrong or unreadable after a move to
+    /// another one. Instead, an import queues the same reindex tasks an
+    /// administrator can queue by hand (`reindexAccounts` and
+    /// `reindexTelemetry` store maintenance), and the server rebuilds the
+    /// index for whatever search store it is configured with once it starts.
+    pub async fn queue_reindex(&self, imported: &[u8]) -> Vec<TaskStoreMaintenanceType> {
+        let mut queued = Vec::new();
+        if imported.contains(&SUBSPACE_PROPERTY) {
+            queued.push(TaskStoreMaintenanceType::ReindexAccounts);
+        }
+        if imported.contains(&SUBSPACE_TELEMETRY_SPAN) {
+            queued.push(TaskStoreMaintenanceType::ReindexTelemetry);
+        }
+        if queued.is_empty() {
+            return queued;
+        }
+
+        let mut batch = BatchBuilder::new();
+        for maintenance_type in &queued {
+            batch.schedule_task(Task::StoreMaintenance(TaskStoreMaintenance {
+                maintenance_type: *maintenance_type,
+                status: TaskStatus::now(),
+                shard_index: None,
+            }));
+        }
+        self.storage
+            .data
+            .write(batch.build_all())
+            .await
+            .failed("Failed to queue the reindex tasks");
+
+        println!(
+            "Queued {} to rebuild the search index; it runs when the server starts.",
+            queued
+                .iter()
+                .map(|t| t.as_str())
+                .collect::<Vec<_>>()
+                .join(" and ")
+        );
+
+        queued
     }
 }
 
@@ -125,17 +189,22 @@ async fn restore_file(store: Store, blob_store: BlobStore, path: &Path) {
         }
         SUBSPACE_COUNTER | SUBSPACE_QUOTA => {
             while let Some((key, value)) = reader.next() {
-                batch.add(
-                    ValueClass::Any(AnyClass {
-                        subspace: reader.subspace,
-                        key,
-                    }),
-                    u64::from_le_bytes(
-                        value
-                            .try_into()
-                            .expect("Failed to deserialize counter/quota"),
-                    ) as i64,
-                );
+                let class = ValueClass::Any(AnyClass {
+                    subspace: reader.subspace,
+                    key,
+                });
+                let value = u64::from_le_bytes(
+                    value
+                        .try_into()
+                        .expect("Failed to deserialize counter/quota"),
+                ) as i64;
+                // inbuxa: the SQL stores add a negative amount with an UPDATE,
+                // which does nothing to a row that isn't there yet, so a
+                // negative counter vanished on import. Create the row first.
+                if value < 0 {
+                    batch.add(class.clone(), 0);
+                }
+                batch.add(class, value);
                 if batch.is_large_batch() {
                     store
                         .write(batch.build_all())

crates/coordinator/Cargo.toml

@@ -8,7 +8,7 @@ store = { path =  "../store" }
 registry = { path =  "../registry" }
 trc = { path = "../trc" }
 futures = { version = "0.3", optional = true }
-tokio = { version = "1.53", features = ["sync", "fs", "io-util"] }
+tokio = { version = "1.53", features = ["sync", "fs", "io-util", "rt", "time"] }
 async-nats = { version = "0.50", default-features = false, features = ["server_2_10", "server_2_11", "aws-lc-rs"], optional = true }
 zenoh = { version = "1.10.0", default-features = false, features = ["auth_pubkey", "transport_multilink", "transport_compression", "transport_quic", "transport_tcp", "transport_tls", "transport_udp"], optional = true }
 rdkafka = { version = "0.39", features = ["cmake-build"], optional = true }

crates/coordinator/src/backend/nats/mod.rs

@@ -2,13 +2,22 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
-use std::sync::Arc;
+use std::{
+    sync::{
+        Arc,
+        atomic::{AtomicBool, Ordering},
+    },
+    time::Duration,
+};
 
 use crate::Coordinator;
 use async_nats::Client;
 use registry::schema::structs::NatsCoordinator;
+use trc::ClusterEvent;
 
 pub mod pubsub;
 
@@ -47,9 +56,116 @@ impl NatsPubSub {
             opts = opts.token(credentials);
         }
 
+        // inbuxa: connect in the background and keep trying, so a node that
+        // starts while NATS is down still joins the cluster once NATS is
+        // back, instead of running without a coordinator until restarted;
+        // and report the connection going and coming back
+        let reporter = Arc::new(Reporter::default());
+        opts = opts.retry_on_initial_connect().event_callback({
+            let reporter = reporter.clone();
+            move |event| {
+                let reporter = reporter.clone();
+                async move { reporter.report(event) }
+            }
+        });
+        let connection_timeout = config.timeout_connection.into_inner();
+
         async_nats::connect_with_options(config.addresses.into_inner(), opts)
             .await
-            .map(|client| Coordinator::Nats(Arc::new(NatsPubSub { client })))
+            .map(|client| {
+                reporter.watch_first_connection(client.clone(), connection_timeout);
+                Coordinator::Nats(Arc::new(NatsPubSub { client }))
+            })
             .map_err(|err| format!("Failed to connect to Nats: {}", err))
     }
+
+    /// inbuxa: whether the client is connected to a NATS server right now.
+    pub fn is_connected(&self) -> bool {
+        matches!(
+            self.client.connection_state(),
+            async_nats::connection::State::Connected
+        )
+    }
+}
+
+/// inbuxa: reports the client's connection events as the server's own.
+#[derive(Default)]
+struct Reporter {
+    connected_once: AtomicBool,
+    // A failed attempt raises an error each time the client retries, every
+    // few seconds while NATS is down: report the first after each change
+    error_reported: AtomicBool,
+}
+
+impl Reporter {
+    fn report(&self, event: async_nats::Event) {
+        match event {
+            async_nats::Event::Connected => {
+                self.connected_once.store(true, Ordering::Relaxed);
+                self.error_reported.store(false, Ordering::Relaxed);
+                trc::event!(Cluster(ClusterEvent::CoordinatorConnected), Type = "nats");
+            }
+            async_nats::Event::Disconnected => {
+                self.error_reported.store(false, Ordering::Relaxed);
+                trc::event!(
+                    Cluster(ClusterEvent::CoordinatorDisconnected),
+                    Type = "nats",
+                    Details = "Connection lost; reconnecting in the background",
+                );
+            }
+            async_nats::Event::Closed => {
+                trc::event!(
+                    Cluster(ClusterEvent::CoordinatorDisconnected),
+                    Type = "nats",
+                    Details = "Connection closed; no further attempts will be made",
+                );
+            }
+            async_nats::Event::ClientError(async_nats::ClientError::MaxReconnects) => {
+                trc::event!(
+                    Cluster(ClusterEvent::CoordinatorDisconnected),
+                    Type = "nats",
+                    Details = "Gave up reconnecting (maxReconnects reached)",
+                );
+            }
+            async_nats::Event::ClientError(err) => {
+                if !self.error_reported.swap(true, Ordering::Relaxed) {
+                    trc::event!(
+                        Cluster(ClusterEvent::CoordinatorError),
+                        Type = "nats",
+                        Details = "Connection attempt failed; retrying",
+                        Reason = err.to_string(),
+                    );
+                }
+            }
+            event => {
+                trc::event!(
+                    Cluster(ClusterEvent::CoordinatorError),
+                    Type = "nats",
+                    Details = event.to_string(),
+                );
+            }
+        }
+    }
+
+    /// The first connection is made in the background, so say so when it
+    /// hasn't been made within the connection timeout. The client keeps
+    /// trying, and reports the connection when it comes.
+    fn watch_first_connection(self: &Arc<Self>, client: Client, timeout: Duration) {
+        let reporter = self.clone();
+        tokio::spawn(async move {
+            tokio::time::sleep(timeout).await;
+            if !reporter.connected_once.load(Ordering::Relaxed)
+                && !matches!(
+                    client.connection_state(),
+                    async_nats::connection::State::Connected
+                )
+            {
+                trc::event!(
+                    Cluster(ClusterEvent::CoordinatorDisconnected),
+                    Type = "nats",
+                    Details = "Not connected at startup; retrying in the background",
+                );
+            }
+        });
+    }
 }

crates/coordinator/src/dispatch.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::{Coordinator, Msg, PubSubStream};
@@ -43,6 +45,17 @@ impl Coordinator {
     pub fn is_none(&self) -> bool {
         matches!(self, Coordinator::None)
     }
+
+    /// inbuxa: whether the coordinator is connected right now, for the
+    /// backends that track it (NATS); `None` for the others and when no
+    /// coordinator is configured.
+    pub fn is_connected(&self) -> Option<bool> {
+        match self {
+            #[cfg(feature = "nats")]
+            Coordinator::Nats(store) => Some(store.is_connected()),
+            _ => None,
+        }
+    }
 }
 
 impl PubSubStream {

crates/http/src/request.rs

@@ -562,6 +562,27 @@ impl ParseHttp for Server {
                         })
                         .into_http_response());
                     }
+                    // inbuxa: the cluster coordinator's connection, for
+                    // monitoring. It stays out of live and ready on purpose:
+                    // a node without its coordinator still serves mail, and
+                    // failing those would have an orchestrator restart, or
+                    // take out of service, every node at once when the
+                    // coordinator goes down
+                    "cluster" => {
+                        let coordinator = &self.core.storage.coordinator;
+                        let (status, state) = match coordinator.is_connected() {
+                            Some(true) => (StatusCode::OK, "connected"),
+                            Some(false) => (StatusCode::SERVICE_UNAVAILABLE, "disconnected"),
+                            None if coordinator.is_none() => (StatusCode::OK, "none"),
+                            None => (StatusCode::OK, "unknown"),
+                        };
+                        return Ok(http_proto::JsonResponse::with_status(
+                            status,
+                            serde_json::json!({ "coordinator": state }),
+                        )
+                        .no_cache()
+                        .into_http_response());
+                    }
                     _ => (),
                 }
             }

crates/jmap/src/inbuxa/telemetry.rs

@@ -427,9 +427,24 @@ pub(crate) async fn trace_query(
             }
             None => false,
         },
-        Property::QueueId => match value.as_str() {
+        // The queue id column is an integer on every search backend, and
+        // holds a trace's first queue id; the keywords carry all of them
+        Property::QueueId => match value
+            .as_str()
+            .and_then(|v| v.trim().parse::<u64>().ok())
+            .or_else(|| value.as_u64())
+        {
             Some(queue_id) => {
-                search.push(SearchFilter::eq(TracingSearchField::QueueId, queue_id.to_string()));
+                search.extend([
+                    SearchFilter::Or,
+                    SearchFilter::eq(TracingSearchField::QueueId, queue_id),
+                    SearchFilter::has_text(
+                        TracingSearchField::Keywords,
+                        queue_id.to_string(),
+                        nlp::language::Language::None,
+                    ),
+                    SearchFilter::End,
+                ]);
                 true
             }
             None => false,

crates/main/src/main.rs

@@ -109,6 +109,10 @@ async fn main() -> std::io::Result<()> {
     // Wait for shutdown signal
     wait_for_shutdown().await;
 
+    // inbuxa: hand back the task locks this node holds, so other nodes can
+    // run those tasks now rather than when the locks expire
+    services::task_manager::lock::release_task_locks(&inner.build_server()).await;
+
     // Shutdown collector
     Collector::shutdown();
 

crates/services/src/broadcast/subscriber.rs

@@ -26,7 +26,7 @@ pub fn spawn_broadcast_subscriber(inner: Arc<Inner>, mut shutdown_rx: watch::Rec
     };
 
     tokio::spawn(async move {
-        let mut retry_count = 0;
+        let mut retry_count: u32 = 0;
 
         trc::event!(Cluster(ClusterEvent::SubscriberStart));
 
@@ -53,7 +53,7 @@ pub fn spawn_broadcast_subscriber(inner: Arc<Inner>, mut shutdown_rx: watch::Rec
                     );
 
                     match tokio::time::timeout(
-                        Duration::from_secs(1 << retry_count.max(6)),
+                        subscribe_retry_delay(retry_count),
                         shutdown_rx.changed(),
                     )
                     .await
@@ -62,7 +62,7 @@ pub fn spawn_broadcast_subscriber(inner: Arc<Inner>, mut shutdown_rx: watch::Rec
                             break;
                         }
                         Err(_) => {
-                            retry_count += 1;
+                            retry_count = retry_count.saturating_add(1);
                             continue;
                         }
                     }
@@ -234,6 +234,11 @@ pub fn spawn_broadcast_subscriber(inner: Arc<Inner>, mut shutdown_rx: watch::Rec
     });
 }
 
+/// Delay before the next subscribe attempt: 1 s, 2 s, 4 s ... capped at 64 s.
+fn subscribe_retry_delay(retry_count: u32) -> Duration {
+    Duration::from_secs(1u64 << retry_count.min(6))
+}
+
 fn log_event(event: &BroadcastEvent) -> trc::Value {
     match event {
         BroadcastEvent::PushNotification(notification) => match notification {
@@ -296,3 +301,19 @@ fn log_event(event: &BroadcastEvent) -> trc::Value {
         BroadcastEvent::QueueRefresh => "QueueRefresh".into(),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::subscribe_retry_delay;
+    use std::time::Duration;
+
+    #[test]
+    fn subscribe_retry_backoff_grows_then_caps() {
+        let schedule: Vec<u64> = (0..10)
+            .map(|n| subscribe_retry_delay(n).as_secs())
+            .collect();
+        assert_eq!(schedule, vec![1, 2, 4, 8, 16, 32, 64, 64, 64, 64]);
+        // No shift overflow at the top of the range.
+        assert_eq!(subscribe_retry_delay(u32::MAX), Duration::from_secs(64));
+    }
+}

crates/services/src/task_manager/index.rs

@@ -91,7 +91,15 @@ impl SearchIndexTask for Server {
                             build_contact_document(self, account_id, document_id).await
                         }
                         IndexDocumentType::File => {
-                            // File indexing not implemented yet
+                            // File indexing not implemented yet. inbuxa: still
+                            // one result per task: update_tasks pairs them by
+                            // position, and a missing one shifts every result
+                            // after it onto the wrong task
+                            results.push(IndexTaskResult {
+                                task_type: TaskType::Insert,
+                                index: task.document_type,
+                                result: TaskResult::Ignored,
+                            });
                             continue;
                         }
                     };
@@ -567,20 +575,14 @@ async fn build_contact_document(
 }
 
 
-// inbuxa: MON-16: a trace's search document, when trace search is on:
-// its event types, queue ids, and addresses, their domains, hosts, IPs,
-// message ids and account names as keywords
+// inbuxa: MON-16: a trace's search document, when trace search is on
 async fn build_tracing_span_document(
     server: &Server,
     span_id: u64,
 ) -> trc::Result<Option<IndexDocument>> {
     use common::telemetry::tracers::store::MaybeTrace;
-    use registry::schema::{enums::SearchTracingField, structs::Search};
-    use store::{
-        search::TracingSearchField,
-        write::{TelemetryClass, ValueClass},
-    };
-    use trc::Key;
+    use registry::schema::structs::Search;
+    use store::write::{TelemetryClass, ValueClass};
 
     let settings = server
         .registry()
@@ -590,7 +592,6 @@ async fn build_tracing_span_document(
     if !settings.index_telemetry {
         return Ok(None);
     }
-    let wants = |field: SearchTracingField| settings.index_tracing_fields.iter().any(|f| *f == field);
     let Some(MaybeTrace(Some(trace))) = server
         .tracing_store()
         .get_value::<MaybeTrace>(ValueKey::from(ValueClass::Telemetry(TelemetryClass::Span(
@@ -601,23 +602,67 @@ async fn build_tracing_span_document(
         return Ok(None);
     };
 
+    Ok(Some(trace_search_document(
+        span_id,
+        &trace,
+        &settings
+            .index_tracing_fields
+            .iter()
+            .copied()
+            .collect::<Vec<_>>(),
+    )))
+}
+
+/// inbuxa: MON-16: the search document for a stored trace.
+///
+/// The event type and queue id columns are integers on every search backend
+/// (BIGINT on PostgreSQL and MySQL, long on Elasticsearch), and each holds a
+/// single value per trace: the event type is the trace's opening event, the
+/// one `x:Trace/query` filters on, and the queue id is the first queue id the
+/// trace mentions. Every queue id also goes into the keywords, so a session
+/// that queued several messages is found by any of them.
+pub fn trace_search_document(
+    span_id: u64,
+    trace: &registry::schema::structs::Trace,
+    fields: &[registry::schema::enums::SearchTracingField],
+) -> IndexDocument {
+    use registry::schema::{enums::SearchTracingField, structs::TraceValue};
+    use store::search::TracingSearchField;
+    use trc::Key;
+
+    let wants = |field: SearchTracingField| fields.contains(&field);
     let mut document = IndexDocument::new(SearchIndex::Tracing).with_id(span_id);
+    if wants(SearchTracingField::EventType)
+        && let Some(first) = trace.events.iter().next()
+    {
+        document.index_unsigned(TracingSearchField::EventType, first.event.to_id() as u64);
+    }
+
     let mut seen = store::ahash::AHashSet::new();
+    let mut queue_id_indexed = false;
     for event in trace.events.iter() {
-        if wants(SearchTracingField::EventType) && seen.insert(event.event.as_str().to_string()) {
-            document.index_keyword(TracingSearchField::EventType, event.event.as_str());
-        }
         for kv in event.key_values.iter() {
             let text = match &kv.value {
-                registry::schema::structs::TraceValue::String(v) => v.value.clone(),
-                registry::schema::structs::TraceValue::UnsignedInt(v) => v.value.to_string(),
-                registry::schema::structs::TraceValue::IpAddr(v) => v.value.to_string(),
+                TraceValue::String(v) => v.value.clone(),
+                TraceValue::UnsignedInt(v) => v.value.to_string(),
+                TraceValue::IpAddr(v) => v.value.to_string(),
                 _ => continue,
             };
             match kv.key {
-                Key::QueueId if wants(SearchTracingField::QueueId) => {
-                    if seen.insert(format!("q:{text}")) {
-                        document.index_keyword(TracingSearchField::QueueId, &text);
+                Key::QueueId => {
+                    let Ok(queue_id) = text.parse::<u64>() else {
+                        continue;
+                    };
+                    if wants(SearchTracingField::QueueId) && !queue_id_indexed {
+                        document.index_unsigned(TracingSearchField::QueueId, queue_id);
+                        queue_id_indexed = true;
+                    }
+                    if wants(SearchTracingField::Keywords) && seen.insert(format!("k:{text}")) {
+                        document.index_text(
+                            TracingSearchField::Keywords,
+                            &text,
+                            nlp::language::Language::None,
+                        );
                     }
                 }
                 Key::From
@@ -648,7 +693,7 @@ async fn build_tracing_span_document(
             }
         }
     }
-    Ok(Some(document))
+    document
 }
 
 // inbuxa: UD-1, UD-4: archives a deleted file, event or contact noted at

crates/services/src/task_manager/lock.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::task_manager::*;
@@ -13,13 +15,21 @@ pub trait TaskLockManager: Sync + Send {
 
 impl TaskLockManager for Server {
     async fn try_lock_task(&self, id: u64) -> bool {
+        // inbuxa: a node that is stopping claims nothing new
+        let locks = &self.inner.ipc.task_locks;
+        if locks.is_stopping() {
+            return false;
+        }
+
         match self
             .in_memory_store()
-            .try_lock(KV_LOCK_TASK, &id.to_be_bytes(), DEFAULT_LOCK_EXPIRY)
+            .try_lock(KV_LOCK_TASK, &id.to_be_bytes(), locks.expiry())
             .await
         {
             Ok(result) => {
-                if !result {
+                if result {
+                    locks.insert(id);
+                } else {
                     trc::event!(
                         TaskManager(TaskManagerEvent::TaskLocked),
                         Id = id,
@@ -48,5 +58,27 @@ impl TaskLockManager for Server {
                     .caused_by(trc::location!())
             );
         }
+        self.inner.ipc.task_locks.remove(id);
     }
 }
+
+/// inbuxa: on a graceful stop, stops claiming tasks and releases every task
+/// lock this node holds, so the rest of the cluster can pick the tasks up at
+/// once instead of after the lock expires. Returns how many were released.
+pub async fn release_task_locks(server: &Server) -> usize {
+    let ids = server.inner.ipc.task_locks.stop();
+    for id in &ids {
+        if let Err(err) = server
+            .in_memory_store()
+            .remove_lock(KV_LOCK_TASK, &id.to_be_bytes())
+            .await
+        {
+            trc::error!(
+                err.details("Failed to release task lock on shutdown")
+                    .ctx(trc::Key::Id, *id)
+                    .caused_by(trc::location!())
+            );
+        }
+    }
+    ids.len()
+}

crates/services/src/task_manager/manager.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::task_manager::acme::AcmeTask;
@@ -18,7 +20,7 @@ use crate::task_manager::report::{self, SubmitReportTask};
 use crate::task_manager::restore_item::RestoreItemTask;
 use crate::task_manager::spam_classifier::SpamFilterMaintenanceTask;
 use crate::task_manager::{
-    DEFAULT_LOCK_EXPIRY, Locked, QUEUE_REFRESH_INTERVAL, TaskDetails, TaskFailureType, TaskInfo,
+    CLAIM_RECHECK_INTERVAL, Locked, QUEUE_REFRESH_INTERVAL, TaskDetails, TaskFailureType, TaskInfo,
     TaskJob, TaskManagerIpc, TaskResult,
 };
 use common::BuildServer;
@@ -124,72 +126,47 @@ pub fn spawn_task_manager(inner: Arc<Inner>) {
                     let server = inner.build_server();
                     let batch_size = server.core.email.index_batch_size;
                     let mut batch = Vec::with_capacity(batch_size);
-                    match server
-                        .store()
-                        .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(
-                            TaskQueueClass::Task { id: job.id },
-                        )))
-                        .await
-                    {
-                        Ok(Some(task)) => {
-                            batch.push(TaskDetails { task, info: job });
-                        }
-                        Ok(None) => {
-                            trc::event!(
-                                TaskManager(TaskManagerEvent::TaskIgnored),
-                                Id = job.id,
-                                Reason = "Task not found in store, likely already processed.",
-                            );
-                        }
-                        Err(err) => {
-                            trc::error!(
-                                err.id(job.id)
-                                    .details("Failed to retrieve task details.")
-                                    .caused_by(trc::location!())
-                            );
-                        }
+                    if let Some(task) = fetch_task(&server, job).await {
+                        batch.push(task);
                     }
 
                     while batch.len() < batch_size {
                         match rx.try_recv() {
                             Ok(job) => {
-                                match server
-                                    .store()
-                                    .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(
-                                        TaskQueueClass::Task { id: job.id },
-                                    )))
-                                    .await
-                                {
-                                    Ok(Some(task)) => {
-                                        batch.push(TaskDetails { task, info: job });
-                                    }
-                                    Ok(None) => {
-                                        trc::event!(
-                                            TaskManager(TaskManagerEvent::TaskIgnored),
-                                            Id = job.id,
-                                            Reason = "Task not found in store, likely already processed.",
-                                        );
-                                    }
-                                    Err(err) => {
-                                        trc::error!(
-                                            err.id(job.id)
-                                                .details("Failed to retrieve task details.")
-                                                .caused_by(trc::location!())
-                                        );
-                                    }
+                                if let Some(task) = fetch_task(&server, job).await {
+                                    batch.push(task);
                                 }
                             }
                             Err(_) => break,
                         }
                     }
 
-                    // Dispatch
+                    // Dispatch. inbuxa: on a task of its own, so a panic
+                    // releases the batch's locks and leaves this worker
+                    // running; a dead worker would keep claiming tasks it
+                    // can never run
                     let mut refresh_queue = false;
-                    let results = server.index(&batch).await.into_iter().map(|r| {
-                        refresh_queue |= r.result.is_retry();
-                        r.result
-                    });
-                    update_tasks(&server, &mut batch, results).await;
+                    let ids = batch.iter().map(|task| task.info.id).collect::<Vec<_>>();
+                    let run = {
+                        let server = server.clone();
+                        tokio::spawn(async move {
+                            let results = server.index(&batch).await;
+                            (batch, results)
+                        })
+                    };
+                    match run.await {
+                        Ok((mut batch, results)) => {
+                            let results = results.into_iter().map(|r| {
+                                refresh_queue |= r.result.is_retry();
+                                r.result
+                            });
+                            update_tasks(&server, &mut batch, results).await;
+                        }
+                        Err(err) => {
+                            worker_failed(&server, &ids, err).await;
+                            refresh_queue = true;
+                        }
+                    }
 
                     if refresh_queue || rx.is_empty() {
                         server.notify_task_queue();
@@ -203,83 +180,31 @@ pub fn spawn_task_manager(inner: Arc<Inner>) {
                     let server = inner.build_server();
                     let mut refresh_queue = false;
 
-                    match server
-                        .store()
-                        .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(
-                            TaskQueueClass::Task { id: job.id },
-                        )))
-                        .await
-                    {
-                        Ok(Some(task)) => {
-                            let result = match &task {
-                                Task::CalendarAlarmEmail(task) => {
-                                    server.send_email_alarm(task, server_instance.clone()).await
-                                }
-                                Task::CalendarAlarmNotification(task) => {
-                                    server.send_display_alarm(task).await
-                                }
-                                Task::CalendarItipMessage(task) => {
-                                    server.send_imip(task, server_instance.clone()).await
-                                }
-                                Task::MergeThreads(task) => server.merge_threads(task).await,
-                                Task::DmarcReport(task) => {
-                                    server
-                                        .submit_report(report::ReportId::Dmarc(task.report_id.id()))
-                                        .await
-                                }
-                                Task::TlsReport(task) => {
-                                    server
-                                        .submit_report(report::ReportId::Tls(task.report_id.id()))
-                                        .await
-                                }
-                                Task::RestoreArchivedItem(task) => server.restore_item(task).await,
-                                Task::DestroyAccount(task) => server.destroy_account(task).await,
-                                Task::AccountMaintenance(task) => {
-                                    server.account_maintenance(task).await
-                                }
-                                Task::TenantMaintenance(task) => {
-                                    server.tenant_maintenance(task).await
-                                }
-                                Task::StoreMaintenance(task) => {
-                                    server.store_maintenance(task).await
-                                }
-                                Task::SpamFilterMaintenance(task) => {
-                                    Box::pin(server.spam_filter_maintenance(task)).await
-                                }
-                                Task::AcmeRenewal(task) => server.acme_management(task).await,
-                                Task::DkimManagement(task_dkim_rotation) => {
-                                    server.dkim_management(task_dkim_rotation).await
-                                }
-                                Task::DnsManagement(task_dns_management) => {
-                                    server.dns_management(task_dns_management).await
-                                }
-                                Task::IndexDocument(_)
-                                | Task::UnindexDocument(_)
-                                | Task::IndexTrace(_) => unreachable!(),
-                            };
+                    if let Some(TaskDetails { task, info }) = fetch_task(&server, job).await {
+                        // inbuxa: on a task of its own, as above
+                        let run = {
+                            let server = server.clone();
+                            let server_instance = server_instance.clone();
+                            tokio::spawn(async move {
+                                let result = run_task(&server, &task, server_instance).await;
+                                (task, result)
+                            })
+                        };
+                        match run.await {
+                            Ok((task, result)) => {
+                                refresh_queue = result.is_retry();
 
-                            refresh_queue = result.is_retry();
-
-                            update_tasks(
-                                &server,
-                                &mut [TaskDetails { task, info: job }],
-                                vec![result],
-                            )
-                            .await;
-                        }
-                        Ok(None) => {
-                            trc::event!(
-                                TaskManager(TaskManagerEvent::TaskIgnored),
-                                Id = job.id,
-                                Reason = "Task not found in store, likely already processed.",
-                            );
-                        }
-                        Err(err) => {
-                            trc::error!(
-                                err.id(job.id)
-                                    .details("Failed to retrieve task details.")
-                                    .caused_by(trc::location!())
-                            );
+                                update_tasks(
+                                    &server,
+                                    &mut [TaskDetails { task, info }],
+                                    vec![result],
+                                )
+                                .await;
+                            }
+                            Err(err) => {
+                                worker_failed(&server, &[info.id], err).await;
+                                refresh_queue = true;
+                            }
                         }
                     }
 
@@ -318,6 +243,13 @@ pub(crate) trait TaskQueueManager: Sync + Send {
 
 impl TaskQueueManager for Server {
     async fn process_tasks(&self, ipc: &mut TaskManagerIpc) -> Duration {
+        // inbuxa: a node that is stopping has released its locks and claims
+        // nothing new
+        let task_locks = &self.inner.ipc.task_locks;
+        if task_locks.is_stopping() {
+            return Duration::from_secs(QUEUE_REFRESH_INTERVAL);
+        }
+        let lock_expiry = task_locks.expiry();
         let now_timestamp = now();
         let from_key = ValueKey::<ValueClass> {
             account_id: 0,
@@ -393,9 +325,7 @@ impl TaskQueueManager for Server {
                                     let locked = entry.get_mut();
                                     if locked.expires <= now || locked.due < task_due {
                                         locked.expires = Instant::now()
-                                            + std::time::Duration::from_secs(
-                                                DEFAULT_LOCK_EXPIRY + 1,
-                                            );
+                                            + std::time::Duration::from_secs(lock_expiry + 1);
                                         locked.due = task_due;
                                         tasks.push((
                                             TaskJob {
@@ -411,9 +341,7 @@ impl TaskQueueManager for Server {
                                 Entry::Vacant(entry) => {
                                     entry.insert(Locked {
                                         expires: Instant::now()
-                                            + std::time::Duration::from_secs(
-                                                DEFAULT_LOCK_EXPIRY + 1,
-                                            ),
+                                            + std::time::Duration::from_secs(lock_expiry + 1),
                                         due: task_due,
                                         revision: ipc.revision,
                                     });
@@ -464,12 +392,26 @@ impl TaskQueueManager for Server {
             let tx = &ipc.txs[task_type_idx as usize];
 
             if tx.capacity() > 0 {
-                if self.try_lock_task(task_job.id).await && tx.send(task_job).await.is_err() {
+                let id = task_job.id;
+                if !self.try_lock_task(id).await {
+                    // inbuxa: another node holds the task. Look again after a
+                    // short while rather than a full lock lifetime from now:
+                    // the holder may have claimed it after this scan began,
+                    // or run on a clock ahead of this one, and waiting the
+                    // whole lifetime again would leave the task stuck for
+                    // another hour past its lock if that holder died
+                    if let Some(locked) = ipc.locked.get_mut(&id) {
+                        locked.expires =
+                            Instant::now() + Duration::from_secs(claim_recheck_interval(lock_expiry));
+                    }
+                } else if tx.send(task_job).await.is_err() {
                     trc::event!(
                         Server(trc::ServerEvent::ThreadError),
                         Details = "Error sending task.",
                         CausedBy = trc::location!()
                     );
+                    // inbuxa: nothing will run it here, so don't hold it
+                    self.remove_index_lock(id).await;
                 }
             } else {
                 // If the channel is full, release the lock so it can be picked up in the next iteration
@@ -481,9 +423,117 @@ impl TaskQueueManager for Server {
         let now = Instant::now();
         ipc.locked
             .retain(|_, locked| locked.expires > now && locked.revision == ipc.revision);
-        Duration::from_secs(next_event.map_or(QUEUE_REFRESH_INTERVAL, |timestamp| {
+        let sleep_for = Duration::from_secs(next_event.map_or(QUEUE_REFRESH_INTERVAL, |timestamp| {
             timestamp.saturating_sub(store::write::now())
-        }))
+        }));
+
+        // inbuxa: wake up when a claim held elsewhere is due to be tried
+        // again, rather than only on the next task or refresh
+        ipc.locked
+            .values()
+            .map(|locked| locked.expires.saturating_duration_since(now))
+            .min()
+            .map_or(sleep_for, |recheck| sleep_for.min(recheck.max(Duration::from_secs(1))))
+    }
+}
+
+async fn run_task(
+    server: &Server,
+    task: &Task,
+    server_instance: Arc<ServerInstance>,
+) -> TaskResult {
+    match task {
+        Task::CalendarAlarmEmail(task) => {
+            server.send_email_alarm(task, server_instance.clone()).await
+        }
+        Task::CalendarAlarmNotification(task) => {
+            server.send_display_alarm(task).await
+        }
+        Task::CalendarItipMessage(task) => {
+            server.send_imip(task, server_instance.clone()).await
+        }
+        Task::MergeThreads(task) => server.merge_threads(task).await,
+        Task::DmarcReport(task) => {
+            server
+                .submit_report(report::ReportId::Dmarc(task.report_id.id()))
+                .await
+        }
+        Task::TlsReport(task) => {
+            server
+                .submit_report(report::ReportId::Tls(task.report_id.id()))
+                .await
+        }
+        Task::RestoreArchivedItem(task) => server.restore_item(task).await,
+        Task::DestroyAccount(task) => server.destroy_account(task).await,
+        Task::AccountMaintenance(task) => {
+            server.account_maintenance(task).await
+        }
+        Task::TenantMaintenance(task) => {
+            server.tenant_maintenance(task).await
+        }
+        Task::StoreMaintenance(task) => {
+            server.store_maintenance(task).await
+        }
+        Task::SpamFilterMaintenance(task) => {
+            Box::pin(server.spam_filter_maintenance(task)).await
+        }
+        Task::AcmeRenewal(task) => server.acme_management(task).await,
+        Task::DkimManagement(task_dkim_rotation) => {
+            server.dkim_management(task_dkim_rotation).await
+        }
+        Task::DnsManagement(task_dns_management) => {
+            server.dns_management(task_dns_management).await
+        }
+        Task::IndexDocument(_)
+        | Task::UnindexDocument(_)
+        | Task::IndexTrace(_) => unreachable!(),
+    }
+}
+
+/// Reads a claimed task. When it is gone or can't be read, the claim is
+/// released: inbuxa: holding it would block the task, everywhere, until
+/// the lock expired.
+async fn fetch_task(server: &Server, job: TaskJob) -> Option<TaskDetails> {
+    match server
+        .store()
+        .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(TaskQueueClass::Task {
+            id: job.id,
+        })))
+        .await
+    {
+        Ok(Some(task)) => Some(TaskDetails { task, info: job }),
+        Ok(None) => {
+            trc::event!(
+                TaskManager(TaskManagerEvent::TaskIgnored),
+                Id = job.id,
+                Reason = "Task not found in store, likely already processed.",
+            );
+            server.remove_index_lock(job.id).await;
+            None
+        }
+        Err(err) => {
+            trc::error!(
+                err.id(job.id)
+                    .details("Failed to retrieve task details.")
+                    .caused_by(trc::location!())
+            );
+            server.remove_index_lock(job.id).await;
+            None
+        }
+    }
+}
+
+/// inbuxa: a task panicked: its locks are released so it runs again, here or
+/// on another node, and the worker carries on.
+async fn worker_failed(server: &Server, ids: &[u64], err: tokio::task::JoinError) {
+    trc::event!(
+        Server(trc::ServerEvent::ThreadError),
+        Details = "Task worker failed",
+        Reason = err.to_string(),
+        CausedBy = trc::location!()
+    );
+    for id in ids {
+        server.remove_index_lock(*id).await;
     }
 }
 
@@ -614,6 +664,13 @@ async fn update_tasks(
     }
 }
 
+/// inbuxa: how long to wait before trying again to claim a task another node
+/// holds: a twelfth of the lock lifetime, so five minutes for the one-hour
+/// lock, never more than that and never under a second.
+pub(crate) fn claim_recheck_interval(lock_expiry: u64) -> u64 {
+    (lock_expiry / 12).clamp(1, CLAIM_RECHECK_INTERVAL)
+}
+
 pub fn perpetual_retry_time(typ: TaskType, attempt: u64) -> Option<u64> {
     matches!(
         typ,

crates/services/src/task_manager/mod.rs

@@ -35,7 +35,9 @@ pub mod scheduler;
 pub mod spam_classifier;
 
 const QUEUE_REFRESH_INTERVAL: u64 = 60 * 5; // 5 minutes
-const DEFAULT_LOCK_EXPIRY: u64 = 60 * 60; // 1 hour
+// inbuxa: the lock lifetime (one hour) lives in common::ipc::TaskLocks, per
+// server, so a graceful stop can release the locks and the tests can shorten it
+const CLAIM_RECHECK_INTERVAL: u64 = 60 * 5; // 5 minutes
 
 pub(crate) struct TaskManagerIpc {
     txs: [mpsc::Sender<TaskJob>; TaskType::COUNT],

crates/store/src/backend/mysql/search.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::{
@@ -19,7 +21,7 @@ use crate::{
     write::SearchIndex,
 };
 use mysql_async::{IsolationLevel, TxOpts, Value, prelude::Queryable};
-use nlp::tokenizers::word::WordTokenizer;
+use nlp::{language::Language, tokenizers::word::WordTokenizer};
 use std::fmt::Write;
 
 impl MysqlStore {
@@ -146,6 +148,20 @@ impl MysqlStore {
     }
 }
 
+// inbuxa: InnoDB's default full-text stopword list
+// (INFORMATION_SCHEMA.INNODB_FT_DEFAULT_STOPWORD) and innodb_ft_min_token_size
+// default; words outside these are not in a FULLTEXT index.
+const FT_STOPWORDS: &[&str] = &[
+    "a", "about", "an", "are", "as", "at", "be", "by", "com", "de", "en", "for", "from", "how",
+    "i", "in", "is", "it", "la", "of", "on", "or", "that", "the", "this", "to", "was", "what",
+    "when", "where", "who", "will", "with", "und", "www",
+];
+const FT_MIN_TOKEN_SIZE: usize = 3;
+
+fn is_ft_indexed(word: &str) -> bool {
+    word.chars().count() >= FT_MIN_TOKEN_SIZE && !FT_STOPWORDS.contains(&word)
+}
+
 fn build_filter(query: &mut String, filters: &[SearchFilter]) -> Vec<Value> {
     if filters.is_empty() {
         return Vec::new();
@@ -171,30 +187,77 @@ fn build_filter(query: &mut String, filters: &[SearchFilter]) -> Vec<Value> {
 
                 if field.is_text() && matches!(op, SearchOperator::Equal | SearchOperator::Contains)
                 {
-                    let (value, mode) = match (value, op) {
-                        (SearchValue::Text { value, .. }, SearchOperator::Equal) => {
-                            (Value::Bytes(format!("{value:?}").into_bytes()), "BOOLEAN")
-                        }
-                        (SearchValue::Text { value, .. }, ..) => {
+                    let (value, mode, unindexed) = match (value, op) {
+                        (SearchValue::Text { value, .. }, SearchOperator::Equal) => (
+                            Value::Bytes(format!("{value:?}").into_bytes()),
+                            "BOOLEAN",
+                            Vec::new(),
+                        ),
+                        (SearchValue::Text { value, language }, ..) => {
                             let mut text_query = String::with_capacity(value.len() + 1);
+                            let mut unindexed = Vec::new();
 
                             for item in WordTokenizer::new(value, MAX_TOKEN_LENGTH) {
-                                if !text_query.is_empty() {
-                                    text_query.push(' ');
+                                // inbuxa: InnoDB never indexes stopwords ("com",
+                                // "de", "www", ...) or words under
+                                // innodb_ft_min_token_size, and a required
+                                // (+word) term it has not indexed matches no row,
+                                // so "example.com" or "[email protected]" found
+                                // nothing. Such words are matched with a
+                                // word-boundary REGEXP instead.
+                                if is_ft_indexed(&item.word) {
+                                    if !text_query.is_empty() {
+                                        text_query.push(' ');
+                                    }
+                                    text_query.push('+');
+                                    text_query.push_str(&item.word);
+                                } else {
+                                    unindexed.push(item.word);
                                 }
-                                text_query.push('+');
-                                text_query.push_str(&item.word);
                             }
 
-                            (Value::Bytes(text_query.into_bytes()), "BOOLEAN")
+                            // For language text (bodies, subjects) the unindexed
+                            // words are noise words and only checked when nothing
+                            // else is left to match; keyword text (addresses,
+                            // contact fields) checks every word, as the other
+                            // backends do.
+                            if !text_query.is_empty() && !matches!(language, Language::None) {
+                                unindexed.clear();
+                            }
+
+                            (Value::Bytes(text_query.into_bytes()), "BOOLEAN", unindexed)
                         }
                         _ => {
                             debug_assert!(false, "Invalid search value for text field");
                             continue;
                         }
                     };
-                    let _ = write!(query, "MATCH({}) AGAINST(? IN {mode} MODE)", field.column());
-                    values.push(value);
+                    if unindexed.is_empty() {
+                        let _ =
+                            write!(query, "MATCH({}) AGAINST(? IN {mode} MODE)", field.column());
+                        values.push(value);
+                    } else {
+                        query.push('(');
+                        let is_empty = matches!(&value, Value::Bytes(v) if v.is_empty());
+                        if !is_empty {
+                            let _ = write!(
+                                query,
+                                "MATCH({}) AGAINST(? IN {mode} MODE) AND ",
+                                field.column()
+                            );
+                            values.push(value);
+                        }
+                        for (i, word) in unindexed.iter().enumerate() {
+                            if i > 0 {
+                                query.push_str(" AND ");
+                            }
+                            let _ = write!(query, "{} REGEXP ?", field.column());
+                            values.push(Value::Bytes(
+                                format!("(^|[^[:alnum:]]){word}([^[:alnum:]]|$)").into_bytes(),
+                            ));
+                        }
+                        query.push(')');
+                    }
                 } else if let SearchValue::KeyValues(kv) = value {
                     let (key, value) = kv.iter().next().unwrap();
 

crates/store/src/backend/postgres/search.rs

@@ -2,12 +2,17 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::{
-    backend::postgres::{
-        DELETE_CHUNK_SIZE, MIN_DELETE_CHUNK_SIZE, PostgresStore, PsqlSearchField, into_error,
-        into_pool_error, is_timeout_error,
+    backend::{
+        MAX_TOKEN_LENGTH,
+        postgres::{
+            DELETE_CHUNK_SIZE, MIN_DELETE_CHUNK_SIZE, PostgresStore, PsqlSearchField, into_error,
+            into_pool_error, is_timeout_error,
+        },
     },
     search::{
         IndexDocument, SearchComparator, SearchDocumentId, SearchFilter, SearchOperator,
@@ -15,7 +20,7 @@ use crate::{
     },
     write::SearchIndex,
 };
-use nlp::language::Language;
+use nlp::{language::Language, tokenizers::space::SpaceTokenizer};
 use std::fmt::Write;
 use tokio_postgres::{
     IsolationLevel,
@@ -43,6 +48,19 @@ impl PostgresStore {
             let primary_keys = index.primary_keys();
             let all_fields = index.all_fields();
             let fields = document.fields;
+            // inbuxa: keyword text (addresses, contact fields, ...) is split into
+            // words before it reaches the text parser, see keyword_terms().
+            let keywords = primary_keys
+                .iter()
+                .chain(all_fields)
+                .map(|field| match fields.get(field) {
+                    Some(SearchValue::Text {
+                        value,
+                        language: Language::None,
+                    }) if field.is_text() => Some(keyword_terms(value)),
+                    _ => None,
+                })
+                .collect::<Vec<_>>();
             let mut values = Vec::with_capacity(fields.len() + 2);
             let mut query = format!("INSERT INTO {} (", index.psql_table());
 
@@ -74,7 +92,20 @@ impl PostgresStore {
                         (0, PG_UNSTEMMED_LANG)
                     };
 
-                    if field.is_text() {
+                    if let Some(keywords) = &keywords[i] {
+                        let _ = write!(&mut query, "to_tsvector('{language}',{value_ref})");
+                        values.push(keywords as &(dyn ToSql + Sync));
+                        if field.sort_column().is_some() {
+                            let value_ref = format!("${}", values.len() + 1);
+                            if text_len > 255 {
+                                let _ = write!(&mut query, ",left({value_ref},255)");
+                            } else {
+                                let _ = write!(&mut query, ",{value_ref}");
+                            }
+                            values.push(value as &(dyn ToSql + Sync));
+                        }
+                        continue;
+                    } else if field.is_text() {
                         let _ = write!(&mut query, "to_tsvector('{language}',{value_ref})");
                     } else if text_len > 512 {
                         query.push_str("left(");
@@ -134,6 +165,7 @@ impl PostgresStore {
     ) -> trc::Result<Vec<R>> {
         let mut query = format!("SELECT {} FROM {}", R::field().column(), index.psql_table());
         let params = self.build_filter(&mut query, filters);
+        let params = params.iter().map(SqlParam::as_sql).collect::<Vec<_>>();
         if !sort.is_empty() {
             build_sort(&mut query, sort);
         }
@@ -155,6 +187,7 @@ impl PostgresStore {
         let table = filter.index.psql_table();
         let mut where_clause = String::new();
         let params = self.build_filter(&mut where_clause, &filter.filters);
+        let params = params.iter().map(SqlParam::as_sql).collect::<Vec<_>>();
         let conn = self.conn_pool.get().await.map_err(into_pool_error)?;
         let s = conn
             .prepare_cached(&format!("DELETE FROM {table}{where_clause}"))
@@ -196,7 +229,7 @@ impl PostgresStore {
         &self,
         query: &mut String,
         filters: &'x [SearchFilter],
-    ) -> Vec<&'x (dyn ToSql + Sync)> {
+    ) -> Vec<SqlParam<'x>> {
         if filters.is_empty() {
             return Vec::new();
         }
@@ -237,6 +270,10 @@ impl PostgresStore {
 
                         if matches!(language, Language::None) {
                             let _ = write!(query, "@@ {method}('{config}', ${value_pos})");
+                            if let SearchValue::Text { value, .. } = value {
+                                values.push(SqlParam::Owned(keyword_terms(value)));
+                                continue;
+                            }
                         } else {
                             let _ = write!(query, "@@ ({method}('{config}', ${value_pos})");
                             for fallback in [PG_FALLBACK_LANG, PG_UNSTEMMED_LANG] {
@@ -247,18 +284,18 @@ impl PostgresStore {
                             }
                             query.push(')');
                         }
-                        values.push(value as &(dyn ToSql + Sync));
+                        values.push(SqlParam::Ref(value));
                     } else if let SearchValue::KeyValues(kv) = value {
                         query.push_str(field.column());
                         query.push(' ');
 
                         let (key, value) = kv.iter().next().unwrap();
-                        values.push(key as &(dyn ToSql + Sync));
+                        values.push(SqlParam::Ref(key));
 
                         if !value.is_empty() {
                             let _ = write!(query, "->> ${value_pos} ");
                             op.write_pqsql(query, values.len() + 1);
-                            values.push(value as &(dyn ToSql + Sync));
+                            values.push(SqlParam::Ref(value));
                         } else {
                             let _ = write!(query, " ? ${value_pos}");
                         }
@@ -267,7 +304,7 @@ impl PostgresStore {
                         query.push(' ');
 
                         op.write_pqsql(query, value_pos);
-                        values.push(value as &(dyn ToSql + Sync));
+                        values.push(SqlParam::Ref(value));
                     }
                 }
                 SearchFilter::And | SearchFilter::Or => {
@@ -321,6 +358,38 @@ impl PostgresStore {
     }
 }
 
+// inbuxa: PostgreSQL's text parser keeps "[email protected]" (and host names,
+// URLs, file paths, ...) as a single token, so a search for "user" or
+// "example.com" never matched an address. Keyword text is split into words the
+// same way the built-in index splits it (SpaceTokenizer: lowercase runs of
+// alphanumerics) on both the indexing and the query side, so a full address,
+// its local part, its domain and the display-name words all match, as they do
+// on the other backends.
+pub(crate) fn keyword_terms(value: &str) -> String {
+    let mut terms = String::with_capacity(value.len());
+    for token in SpaceTokenizer::new(value, MAX_TOKEN_LENGTH) {
+        if !terms.is_empty() {
+            terms.push(' ');
+        }
+        terms.push_str(&token);
+    }
+    terms
+}
+
+pub(super) enum SqlParam<'x> {
+    Ref(&'x (dyn ToSql + Sync)),
+    Owned(String),
+}
+
+impl SqlParam<'_> {
+    fn as_sql(&self) -> &(dyn ToSql + Sync) {
+        match self {
+            SqlParam::Ref(value) => *value,
+            SqlParam::Owned(value) => value,
+        }
+    }
+}
+
 fn build_sort(query: &mut String, sort: &[SearchComparator]) {
     query.push_str(" ORDER BY ");
     for (i, comparator) in sort.iter().enumerate() {

crates/trc/src/event/enums.rs

@@ -10,8 +10,9 @@
 
 // inbuxa: 637 to 641 are the fork's SCIM events (SCIM-54); 642 is
 // auth.legacy-protocol-refused (legacy-protocols LP-6); 643 is
-// security.legacy-protocols-changed (LP-8)
-pub const TOTAL_EVENT_COUNT: usize = 644;
+// security.legacy-protocols-changed (LP-8); 644 to 646 are the cluster
+// coordinator's connection events
+pub const TOTAL_EVENT_COUNT: usize = 647;
 pub const TOTAL_METRIC_COUNT: usize = 369;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -150,6 +151,10 @@ pub enum ClusterEvent {
     MessageSkipped = 47,
     MessageInvalid = 49,
     NodeIdRenewed = 275,
+    // inbuxa: the coordinator's connection
+    CoordinatorConnected = 644,
+    CoordinatorDisconnected = 645,
+    CoordinatorError = 646,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]

crates/trc/src/event/enums_impl.rs

@@ -81,6 +81,10 @@ impl EventType {
             b"cluster.message-skipped" => EventType::Cluster(ClusterEvent::MessageSkipped),
             b"cluster.message-invalid" => EventType::Cluster(ClusterEvent::MessageInvalid),
             b"cluster.node-id-renewed" => EventType::Cluster(ClusterEvent::NodeIdRenewed),
+            // inbuxa: coordinator connection
+            b"cluster.coordinator-connected" => EventType::Cluster(ClusterEvent::CoordinatorConnected),
+            b"cluster.coordinator-disconnected" => EventType::Cluster(ClusterEvent::CoordinatorDisconnected),
+            b"cluster.coordinator-error" => EventType::Cluster(ClusterEvent::CoordinatorError),
             b"dane.authentication-success" => EventType::Dane(DaneEvent::AuthenticationSuccess),
             b"dane.authentication-failure" => EventType::Dane(DaneEvent::AuthenticationFailure),
             b"dane.no-certificates-found" => EventType::Dane(DaneEvent::NoCertificatesFound),
@@ -742,6 +746,14 @@ impl EventType {
             EventType::Cluster(ClusterEvent::MessageSkipped) => "cluster.message-skipped",
             EventType::Cluster(ClusterEvent::MessageInvalid) => "cluster.message-invalid",
             EventType::Cluster(ClusterEvent::NodeIdRenewed) => "cluster.node-id-renewed",
+            // inbuxa: coordinator connection
+            EventType::Cluster(ClusterEvent::CoordinatorConnected) => {
+                "cluster.coordinator-connected"
+            }
+            EventType::Cluster(ClusterEvent::CoordinatorDisconnected) => {
+                "cluster.coordinator-disconnected"
+            }
+            EventType::Cluster(ClusterEvent::CoordinatorError) => "cluster.coordinator-error",
             EventType::Dane(DaneEvent::AuthenticationSuccess) => "dane.authentication-success",
             EventType::Dane(DaneEvent::AuthenticationFailure) => "dane.authentication-failure",
             EventType::Dane(DaneEvent::NoCertificatesFound) => "dane.no-certificates-found",
@@ -1524,6 +1536,10 @@ impl EventType {
             EventType::Cluster(ClusterEvent::MessageSkipped) => 47,
             EventType::Cluster(ClusterEvent::MessageInvalid) => 49,
             EventType::Cluster(ClusterEvent::NodeIdRenewed) => 275,
+            // inbuxa: coordinator connection
+            EventType::Cluster(ClusterEvent::CoordinatorConnected) => 644,
+            EventType::Cluster(ClusterEvent::CoordinatorDisconnected) => 645,
+            EventType::Cluster(ClusterEvent::CoordinatorError) => 646,
             EventType::Dane(DaneEvent::AuthenticationSuccess) => 67,
             EventType::Dane(DaneEvent::AuthenticationFailure) => 66,
             EventType::Dane(DaneEvent::NoCertificatesFound) => 69,
@@ -2176,6 +2192,10 @@ impl EventType {
             47 => Some(EventType::Cluster(ClusterEvent::MessageSkipped)),
             49 => Some(EventType::Cluster(ClusterEvent::MessageInvalid)),
             275 => Some(EventType::Cluster(ClusterEvent::NodeIdRenewed)),
+            // inbuxa: coordinator connection
+            644 => Some(EventType::Cluster(ClusterEvent::CoordinatorConnected)),
+            645 => Some(EventType::Cluster(ClusterEvent::CoordinatorDisconnected)),
+            646 => Some(EventType::Cluster(ClusterEvent::CoordinatorError)),
             67 => Some(EventType::Dane(DaneEvent::AuthenticationSuccess)),
             66 => Some(EventType::Dane(DaneEvent::AuthenticationFailure)),
             69 => Some(EventType::Dane(DaneEvent::NoCertificatesFound)),
@@ -3114,6 +3134,10 @@ impl EventType {
             EventType::Auth(AuthEvent::TooManyAttempts) => Level::Warn,
             EventType::Calendar(CalendarEvent::AlarmFailed) => Level::Warn,
             EventType::Cluster(ClusterEvent::SubscriberDisconnected) => Level::Warn,
+            // inbuxa: coordinator connection
+            EventType::Cluster(ClusterEvent::CoordinatorConnected) => Level::Info,
+            EventType::Cluster(ClusterEvent::CoordinatorDisconnected) => Level::Warn,
+            EventType::Cluster(ClusterEvent::CoordinatorError) => Level::Warn,
             EventType::Delivery(DeliveryEvent::MissingOutboundHostname) => Level::Warn,
             EventType::Delivery(DeliveryEvent::ConcurrencyLimitExceeded) => Level::Warn,
             EventType::Delivery(DeliveryEvent::RateLimitExceeded) => Level::Warn,
@@ -3244,6 +3268,10 @@ impl EventType {
             EventType::Cluster(ClusterEvent::MessageSkipped) => "PubSub message skipped",
             EventType::Cluster(ClusterEvent::MessageInvalid) => "Invalid PubSub message",
             EventType::Cluster(ClusterEvent::NodeIdRenewed) => "Node ID renewed",
+            // inbuxa: coordinator connection
+            EventType::Cluster(ClusterEvent::CoordinatorConnected) => "Coordinator connected",
+            EventType::Cluster(ClusterEvent::CoordinatorDisconnected) => "Coordinator unavailable",
+            EventType::Cluster(ClusterEvent::CoordinatorError) => "Coordinator error",
             EventType::Dane(DaneEvent::AuthenticationSuccess) => "DANE authentication successful",
             EventType::Dane(DaneEvent::AuthenticationFailure) => "DANE authentication failed",
             EventType::Dane(DaneEvent::NoCertificatesFound) => "No certificates found for DANE",
@@ -4322,6 +4350,10 @@ impl EventType {
             EventType::Cluster(ClusterEvent::MessageSkipped),
             EventType::Cluster(ClusterEvent::MessageInvalid),
             EventType::Cluster(ClusterEvent::NodeIdRenewed),
+            // inbuxa: coordinator connection
+            EventType::Cluster(ClusterEvent::CoordinatorConnected),
+            EventType::Cluster(ClusterEvent::CoordinatorDisconnected),
+            EventType::Cluster(ClusterEvent::CoordinatorError),
             EventType::Dane(DaneEvent::AuthenticationSuccess),
             EventType::Dane(DaneEvent::AuthenticationFailure),
             EventType::Dane(DaneEvent::NoCertificatesFound),

docs/spec/features/monitoring.md

@@ -212,10 +212,15 @@ unchanged.
 - **MON-16.** With `indexTelemetry` on, storing a trace schedules an
   `IndexTrace` task. The task builds one document for `SearchIndex::Tracing`
   with the fields named in `indexTracingFields`:
-  - `eventType`: every event type in the trace;
-  - `queueId`: every `queueId` value;
+  - `eventType`: the trace's opening event, as its numeric id;
+  - `queueId`: the first `queueId` value, as an integer;
   - `keywords`: every address in `from` and `to`, each address's domain, every
-    `domain`, `hostname`, `remoteIp`, `messageId` and `accountName` value.
+    `domain`, `hostname`, `remoteIp`, `messageId` and `accountName` value,
+    and every `queueId` value.
+  The event type and queue id are single integer columns on every search
+  backend (BIGINT on PostgreSQL and MySQL), so the `queueId` filter matches
+  the column or any queue id in the keywords, and a session that queued
+  several messages is found by each of them.
   So searching `example.org` finds every trace to or from that domain, as the
   upstream suite expects. With `indexTelemetry` off nothing is indexed, and
   the `text` and `queueId` filters are refused (see "Interfaces").

resources/schema/schema.json.sha256

@@ -1 +1 @@
-VbnFuwCOTBh0s2T-NuRhb2JaJr8Jl5s3LgXv4Pv2sTg
+XFI3xuKC_rH1KZyaVBF0uTIiRDXRqyYboijquiGz2eg

tests/src/cluster/coordinator.rs

@@ -0,0 +1,145 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! A node that starts while its NATS coordinator is down joins the cluster
+//! once NATS comes up, without a restart, and reports the coordinator's
+//! connection on `/healthz/cluster` as it goes and comes back.
+
+use crate::utils::server::TestServerBuilder;
+use coordinator::Coordinator;
+use registry::{
+    schema::{
+        enums::NetworkListenerProtocol,
+        structs::{Coordinator as CoordinatorSetting, NatsCoordinator},
+    },
+    types::map::Map,
+};
+use serde_json::{Value, json};
+use std::time::{Duration, Instant};
+use testcontainers::{
+    GenericImage, ImageExt, core::IntoContainerPort, core::WaitFor, runners::AsyncRunner,
+};
+
+const HTTP_PORT: u16 = 11_310;
+const TOPIC: &str = "inbuxa-coordinator-test";
+
+#[tokio::test(flavor = "multi_thread")]
+pub async fn coordinator_reconnect_tests() {
+    println!("Running coordinator reconnect tests...");
+
+    // A port with no NATS server behind it, yet
+    let nats_port = std::net::TcpListener::bind("127.0.0.1:0")
+        .unwrap()
+        .local_addr()
+        .unwrap()
+        .port();
+    let config = NatsCoordinator {
+        addresses: Map::new(vec![format!("127.0.0.1:{nats_port}")]),
+        use_tls: false,
+        timeout_connection: 1_000u64.into(),
+        ..Default::default()
+    };
+
+    // 1. The node starts, without a build error, while NATS is down, and
+    // says so
+    let test = TestServerBuilder::new("coordinator_reconnect_tests")
+        .await
+        .with_object(CoordinatorSetting::Nats(config.clone()))
+        .await
+        .with_listener(NetworkListenerProtocol::Http, "http", HTTP_PORT, true)
+        .await
+        .build()
+        .await;
+    let coordinator = test.server.core.storage.coordinator.clone();
+    assert!(
+        coordinator.is_enabled(),
+        "a coordinator, though not connected"
+    );
+    assert_eq!(coordinator.is_connected(), Some(false));
+    assert_eq!(
+        cluster_health().await,
+        (503, json!({"coordinator": "disconnected"}))
+    );
+
+    // A subscription made now, as the broadcast subscriber makes it at
+    // startup, has to work once NATS is up
+    let mut stream = coordinator.subscribe(TOPIC).await.unwrap();
+
+    // 2. NATS comes up: the node connects on its own
+    let nats = GenericImage::new("nats", "latest")
+        .with_wait_for(WaitFor::message_on_stderr("Server is ready"))
+        .with_mapped_port(nats_port, 4222.tcp())
+        .start()
+        .await
+        .expect("Failed to start NATS container");
+    wait_for_health(200, "connected").await;
+    let other_node = coordinator::backend::nats::NatsPubSub::open(config.clone())
+        .await
+        .unwrap();
+    wait_until_connected(&other_node).await;
+    round_trip(&other_node, &mut stream, b"after startup").await;
+
+    // 3. NATS goes away: the node reports it; and it comes back: the node
+    // reconnects and the same subscription carries on
+    nats.stop().await.unwrap();
+    wait_for_health(503, "disconnected").await;
+    nats.start().await.unwrap();
+    wait_for_health(200, "connected").await;
+    wait_until_connected(&other_node).await;
+    round_trip(&other_node, &mut stream, b"after reconnect").await;
+
+    drop(nats);
+    if test.is_reset() {
+        test.temp_dir.delete();
+    }
+}
+
+async fn cluster_health() -> (u16, Value) {
+    let response = reqwest::Client::builder()
+        .danger_accept_invalid_certs(true)
+        .timeout(Duration::from_secs(5))
+        .build()
+        .unwrap()
+        .get(format!("https://127.0.0.1:{HTTP_PORT}/healthz/cluster"))
+        .send()
+        .await
+        .unwrap();
+    let status = response.status().as_u16();
+    (status, response.json().await.unwrap())
+}
+
+async fn wait_for_health(status: u16, state: &str) {
+    let started = Instant::now();
+    loop {
+        let health = cluster_health().await;
+        if health == (status, json!({"coordinator": state})) {
+            return;
+        }
+        assert!(
+            started.elapsed() < Duration::from_secs(30),
+            "expected {status} {state}, still {health:?}"
+        );
+        tokio::time::sleep(Duration::from_millis(250)).await;
+    }
+}
+
+async fn wait_until_connected(coordinator: &Coordinator) {
+    let started = Instant::now();
+    while coordinator.is_connected() != Some(true) {
+        assert!(started.elapsed() < Duration::from_secs(30), "not connected");
+        tokio::time::sleep(Duration::from_millis(100)).await;
+    }
+}
+
+/// Another node publishes; this one's subscription receives it.
+async fn round_trip(from: &Coordinator, stream: &mut coordinator::PubSubStream, payload: &[u8]) {
+    from.publish(TOPIC, payload.to_vec()).await.unwrap();
+    let message = tokio::time::timeout(Duration::from_secs(10), stream.next())
+        .await
+        .expect("no message within 10 seconds")
+        .expect("subscription ended");
+    assert_eq!(message.payload(), payload);
+}

tests/src/cluster/mod.rs

@@ -2,7 +2,11 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 pub mod broadcast;
+#[cfg(feature = "nats")]
+pub mod coordinator; // inbuxa: coordinator reconnects
 pub mod stress;

tests/src/store/import_export.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::utils::{
@@ -9,14 +11,22 @@ use crate::utils::{
     server::TestServer,
     temp_dir::TempDir,
 };
-use ::registry::schema::enums::CompressionAlgo;
+use ::registry::schema::{
+    enums::{CompressionAlgo, TaskStoreMaintenanceType},
+    prelude::ObjectType,
+    structs::Task,
+};
 use ahash::AHashSet;
-use common::{DATABASE_SCHEMA_VERSION, manager::backup::BackupParams};
+use common::{
+    DATABASE_SCHEMA_VERSION,
+    manager::{SPAM_CLASSIFIER_KEY, SPAM_TRAINER_KEY, backup::BackupParams},
+};
 use store::{
     rand,
     write::{
         AnyClass, AnyKey, BatchBuilder, BlobLink, BlobOp, Operation, QueueClass, QueueEvent,
-        RegistryClass, ValueClass, key::KeySerializer,
+        RegistryClass, TaskQueueClass, ValueClass,
+        key::{DeserializeBigEndian, KeySerializer},
     },
     *,
 };
@@ -167,6 +177,50 @@ pub async fn test(test: &TestServer) {
     }
     db.write(batch.build_all()).await.unwrap();
 
+    // inbuxa: registry objects kept outside the registry subspace (archived
+    // items for undelete, spam training samples, directory entries) and the
+    // fork's own subspace. Exports used to leave the first two behind.
+    println!("Creating archived items, spam samples and fork data...");
+    let mut batch = BatchBuilder::new();
+    for item_id in [1u64, 2, 3] {
+        for object in [
+            ObjectType::ArchivedItem,
+            ObjectType::SpamTrainingSample,
+            ObjectType::Account,
+        ] {
+            batch.set(
+                ValueClass::Registry(RegistryClass::Item {
+                    object_id: object as u16,
+                    item_id,
+                }),
+                random_bytes(item_id as usize * 64),
+            );
+        }
+        batch.set(
+            ValueClass::Any(AnyClass {
+                subspace: SUBSPACE_INBUXA,
+                key: [b'U', b'x']
+                    .into_iter()
+                    .chain(item_id.to_be_bytes())
+                    .collect(),
+            }),
+            random_bytes(32),
+        );
+    }
+    db.write(batch.build_all()).await.unwrap();
+
+    // inbuxa: the trained spam classifier lives in blobs with fixed names
+    let mut named_blobs = Vec::new();
+    for key in [SPAM_CLASSIFIER_KEY, SPAM_TRAINER_KEY] {
+        let data = random_bytes(4096);
+        test.server
+            .blob_store()
+            .put_blob(key, &data, CompressionAlgo::Lz4)
+            .await
+            .unwrap();
+        named_blobs.push((key, data));
+    }
+
     // Create directory data
     println!("Creating directory data...");
     let mut batch = BatchBuilder::new();
@@ -185,6 +239,17 @@ pub async fn test(test: &TestServer) {
     println!("Calculating store hash...");
     let snapshot = Snapshot::new(&db).await;
     assert!(!snapshot.keys.is_empty(), "Store hash counts are empty",);
+    for subspace in [
+        SUBSPACE_DELETED_ITEMS,
+        SUBSPACE_SPAM_SAMPLES,
+        SUBSPACE_INBUXA,
+    ] {
+        assert!(
+            snapshot.keys.iter().any(|k| k.subspace == subspace),
+            "No test data in subspace {}",
+            char::from(subspace)
+        );
+    }
 
     // Export store
     println!("Exporting store...");
@@ -210,22 +275,188 @@ pub async fn test(test: &TestServer) {
             .finalize(),
     );
     db.write(batch.build_all()).await.unwrap();
-    test.server.core.restore(temp_dir.path.clone()).await;
+    for (key, _) in &named_blobs {
+        test.server.blob_store().delete_blob(key).await.unwrap();
+    }
+    let imported = test.server.core.restore(temp_dir.path.clone()).await;
     let mut batch = BatchBuilder::new();
     batch.clear(ValueClass::NodeId(0));
     db.write(batch.build_all()).await.unwrap();
+    for subspace in [
+        SUBSPACE_DELETED_ITEMS,
+        SUBSPACE_SPAM_SAMPLES,
+        SUBSPACE_INBUXA,
+    ] {
+        assert!(
+            imported.contains(&subspace),
+            "Subspace {} was not exported",
+            char::from(subspace)
+        );
+    }
 
     // Verify hash
     print!("Verifying store hash...");
     snapshot.assert_is_eq(&Snapshot::new(&db).await);
+    assert_named_blobs(test.server.blob_store(), &named_blobs).await;
     println!(" GREAT SUCCESS!");
 
+    // inbuxa: import the same export into a fresh store of another backend,
+    // the way a move from one database to another does it
+    #[cfg(all(feature = "rocks", feature = "sqlite"))]
+    cross_backend(test, &db, &temp_dir, &named_blobs).await;
+
     // Destroy store
+    for (key, _) in &named_blobs {
+        test.server.blob_store().delete_blob(key).await.unwrap();
+    }
     store_destroy(&db).await;
     store_assert_is_empty(&db, db.clone().into(), true).await;
     temp_dir.delete();
 }
 
+#[cfg(all(feature = "rocks", feature = "sqlite"))]
+async fn cross_backend(
+    test: &TestServer,
+    source: &Store,
+    export: &TempDir,
+    named_blobs: &[(&[u8], Vec<u8>)],
+) {
+    let source_type = std::env::var("STORE").unwrap();
+    let target_type = if source_type.eq_ignore_ascii_case("sqlite") {
+        "RocksDb"
+    } else {
+        "Sqlite"
+    };
+    println!("Importing the export into a fresh {target_type} store...");
+
+    let target_dir = TempDir::new("art_vandelay_cross_backend", true);
+    let target = Store::build(
+        crate::utils::storage::build_data_store(target_type, &target_dir.path.to_string_lossy())
+            .await,
+    )
+    .await
+    .unwrap();
+    target.create_tables().await.unwrap();
+    store_destroy(&target).await;
+
+    let mut core = test.server.core.as_ref().clone();
+    core.storage.data = target.clone();
+    core.storage.blob = target.clone().into();
+    let imported = core.restore(export.path.clone()).await;
+
+    // Counters are stored differently by the SQL and key-value backends, so
+    // compare their keys here and their values through the counter API.
+    print!("Verifying {target_type} store hash...");
+    Snapshot::new_portable(source)
+        .await
+        .assert_is_eq(&Snapshot::new_portable(&target).await);
+    for subspace in [SUBSPACE_COUNTER, SUBSPACE_QUOTA] {
+        let mut keys = Vec::new();
+        source
+            .iterate(
+                IterateParams::new(
+                    AnyKey {
+                        subspace,
+                        key: vec![0u8],
+                    },
+                    AnyKey {
+                        subspace,
+                        key: vec![u8::MAX; 10],
+                    },
+                )
+                .no_values(),
+                |key, _| {
+                    keys.push(key.to_vec());
+                    Ok(true)
+                },
+            )
+            .await
+            .unwrap();
+        for key in keys {
+            let class = || {
+                ValueClass::Any(AnyClass {
+                    subspace,
+                    key: key.clone(),
+                })
+            };
+            assert_eq!(
+                source.get_counter(class()).await.unwrap(),
+                target.get_counter(class()).await.unwrap(),
+                "Counter mismatch in {} for {key:?}",
+                char::from(subspace)
+            );
+        }
+    }
+    assert_named_blobs(&core.storage.blob, named_blobs).await;
+    println!(" GREAT SUCCESS!");
+
+    // The search index isn't exported; the import queues its rebuild
+    let queued = core.queue_reindex(&imported).await;
+    let expected = [
+        TaskStoreMaintenanceType::ReindexAccounts,
+        TaskStoreMaintenanceType::ReindexTelemetry,
+    ];
+    assert_eq!(queued, expected);
+    let mut task_ids = Vec::new();
+    target
+        .iterate(
+            IterateParams::new(
+                AnyKey {
+                    subspace: SUBSPACE_TASK_QUEUE,
+                    key: vec![0u8],
+                },
+                AnyKey {
+                    subspace: SUBSPACE_TASK_QUEUE,
+                    key: vec![u8::MAX; 20],
+                },
+            )
+            .no_values(),
+            |key, _| {
+                if key.deserialize_be_u64(0)? == 0 {
+                    task_ids.push(key.deserialize_be_u64(U64_LEN)?);
+                }
+                Ok(true)
+            },
+        )
+        .await
+        .unwrap();
+    let mut found = Vec::new();
+    for id in task_ids {
+        match target
+            .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(
+                TaskQueueClass::Task { id },
+            )))
+            .await
+            .unwrap()
+        {
+            Some(Task::StoreMaintenance(task)) => found.push(task.maintenance_type),
+            other => panic!("Unexpected task {other:?}"),
+        }
+    }
+    found.sort_by_key(|t| *t as u16);
+    assert_eq!(found, expected, "Queued tasks don't match");
+
+    store_destroy(&target).await;
+    drop(core);
+    drop(target);
+    target_dir.delete();
+}
+
+async fn assert_named_blobs(blob_store: &BlobStore, named_blobs: &[(&[u8], Vec<u8>)]) {
+    for (key, data) in named_blobs {
+        assert_eq!(
+            blob_store
+                .get_blob(key, 0..usize::MAX)
+                .await
+                .unwrap()
+                .as_ref(),
+            Some(data),
+            "Blob {} was not restored",
+            String::from_utf8_lossy(key)
+        );
+    }
+}
+
 #[derive(Debug, PartialEq, Eq)]
 struct Snapshot {
     keys: AHashSet<KeyValue>,
@@ -240,7 +471,19 @@ struct KeyValue {
 
 impl Snapshot {
     async fn new(db: &Store) -> Self {
-        let is_sql = db.is_sql();
+        Self::build(db, !db.is_sql(), true).await
+    }
+
+    /// Comparable across backends: no counter values, which the SQL and
+    /// key-value stores encode differently, and no blobs, which only live in
+    /// the data store when it doubles as the blob store.
+    #[cfg(all(feature = "rocks", feature = "sqlite"))]
+    async fn new_portable(db: &Store) -> Self {
+        Self::build(db, false, false).await
+    }
+
+    async fn build(db: &Store, counter_values: bool, with_blobs: bool) -> Self {
+        let is_sql = !counter_values;
 
         let mut keys = AHashSet::new();
 
@@ -265,7 +508,12 @@ impl Snapshot {
             (SUBSPACE_QUOTA, !is_sql),
             (SUBSPACE_REPORT_OUT, true),
             (SUBSPACE_REPORT_IN, true),
+            (SUBSPACE_DIRECTORY, true),
+            (SUBSPACE_INBUXA, true),
         ] {
+            if subspace == SUBSPACE_BLOBS && !with_blobs {
+                continue;
+            }
             let from_key = AnyKey {
                 subspace,
                 key: vec![0u8],

tests/src/store/mod.rs

@@ -21,6 +21,7 @@ pub mod replica_cluster; // inbuxa: read replicas across nodes
 pub mod scaleout; // inbuxa: scale-out storage
 #[cfg(any(feature = "postgres", feature = "mysql"))]
 pub mod sql_timeout;
+pub mod task_locks; // inbuxa: task locks across nodes
 
 use crate::utils::server::TestServerBuilder;
 use std::io::Read;

tests/src/store/query.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::{store::deflate_test_resource, utils::server::TestServer};
@@ -122,6 +124,15 @@ pub async fn test(test: &TestServer) {
     println!("Running global id filtering tests...");
     test_global(store.clone()).await;
 
+    // inbuxa: trace documents as the index task builds them
+    println!("Running trace document tests...");
+    test_trace_documents(store.clone()).await;
+
+    // inbuxa: address fields match by full address, local part, domain and
+    // display name on every backend
+    println!("Running address search tests...");
+    test_address_search(store.clone()).await;
+
     // Large document insert test
     println!("Running large document insert tests...");
     let mut large_text = String::with_capacity(20 * 1024 * 1024);
@@ -809,3 +820,312 @@ async fn test_global(store: SearchStore) {
         AHashSet::from_iter([3, 4, 5])
     );
 }
+
+// inbuxa: MON-16: documents built by the index task from stored traces go
+// into every search backend (the SQL backends type etyp and qid as BIGINT)
+// and are found again by queue id and keyword.
+async fn test_trace_documents(store: SearchStore) {
+    use registry::schema::{
+        enums::SearchTracingField,
+        structs::{
+            Trace, TraceEvent, TraceKeyValue, TraceValue, TraceValueString,
+            TraceValueUnsignedInt,
+        },
+    };
+    use services::task_manager::index::trace_search_document;
+    use trc::{DeliveryEvent, EventType, Key, SmtpEvent};
+
+    let kv_u = |key: Key, value: u64| TraceKeyValue {
+        key,
+        value: TraceValue::UnsignedInt(TraceValueUnsignedInt { value }),
+    };
+    let kv_s = |key: Key, value: &str| TraceKeyValue {
+        key,
+        value: TraceValue::String(TraceValueString {
+            value: value.to_string(),
+        }),
+    };
+    let event = |event: EventType, key_values: Vec<TraceKeyValue>| TraceEvent {
+        event,
+        key_values: key_values.into(),
+        ..Default::default()
+    };
+    let fields = [
+        SearchTracingField::EventType,
+        SearchTracingField::QueueId,
+        SearchTracingField::Keywords,
+    ];
+
+    // An SMTP session that queued two messages, and a delivery attempt
+    let session = Trace {
+        events: vec![
+            event(
+                EventType::Smtp(SmtpEvent::ConnectionStart),
+                vec![kv_s(Key::RemoteIp, "192.0.2.7")],
+            ),
+            event(
+                EventType::Smtp(SmtpEvent::MailFrom),
+                vec![kv_s(Key::From, "[email protected]")],
+            ),
+            event(
+                EventType::Smtp(SmtpEvent::RcptTo),
+                vec![kv_u(Key::QueueId, 9_000_000_001), kv_s(Key::To, "[email protected]")],
+            ),
+            event(
+                EventType::Smtp(SmtpEvent::RcptTo),
+                vec![kv_u(Key::QueueId, 9_000_000_002)],
+            ),
+        ]
+        .into(),
+    };
+    let delivery = Trace {
+        events: vec![event(
+            EventType::Delivery(DeliveryEvent::AttemptStart),
+            vec![kv_u(Key::QueueId, 9_000_000_003), kv_s(Key::Hostname, "relay.example.net")],
+        )]
+        .into(),
+    };
+    let documents = vec![
+        trace_search_document(100, &session, &fields),
+        trace_search_document(101, &delivery, &fields),
+    ];
+    assert!(
+        documents
+            .iter()
+            .all(|d| d.has_field(&SearchField::Tracing(TracingSearchField::QueueId))
+                && d.has_field(&SearchField::Tracing(TracingSearchField::EventType))),
+        "trace documents carry a queue id and an event type"
+    );
+    store.index(documents).await.unwrap();
+    if let SearchStore::ElasticSearch(store) = &store {
+        store.refresh_index(SearchIndex::Tracing).await.unwrap();
+    }
+
+    let query = |filters: Vec<SearchFilter>| {
+        let store = store.clone();
+        async move {
+            store
+                .query_global(
+                    SearchQuery::new(SearchIndex::Tracing)
+                        .with_filter(SearchFilter::ge(SearchField::Id, 100u64))
+                        .with_filters(filters),
+                )
+                .await
+                .unwrap()
+                .into_iter()
+                .collect::<AHashSet<_>>()
+        }
+    };
+    // By queue id, the way x:Trace/query asks: the queue id column, or any
+    // queue id in the keywords
+    let by_queue_id = |queue_id: u64| {
+        vec![
+            SearchFilter::Or,
+            SearchFilter::eq(TracingSearchField::QueueId, queue_id),
+            SearchFilter::has_text(
+                TracingSearchField::Keywords,
+                queue_id.to_string(),
+                Language::None,
+            ),
+            SearchFilter::End,
+        ]
+    };
+    assert_eq!(query(by_queue_id(9_000_000_001)).await, AHashSet::from_iter([100]));
+    assert_eq!(query(by_queue_id(9_000_000_002)).await, AHashSet::from_iter([100]));
+    assert_eq!(query(by_queue_id(9_000_000_003)).await, AHashSet::from_iter([101]));
+    assert_eq!(query(by_queue_id(9_000_000_004)).await, AHashSet::new());
+    assert_eq!(
+        query(vec![SearchFilter::eq(TracingSearchField::QueueId, 9_000_000_003u64)]).await,
+        AHashSet::from_iter([101])
+    );
+    // By opening event type
+    assert_eq!(
+        query(vec![SearchFilter::eq(
+            TracingSearchField::EventType,
+            EventType::Delivery(DeliveryEvent::AttemptStart).to_id() as u64,
+        )])
+        .await,
+        AHashSet::from_iter([101])
+    );
+    // By keyword: an address, lowercased, and its domain
+    assert_eq!(
+        query(vec![SearchFilter::has_text(
+            TracingSearchField::Keywords,
+            "example.org",
+            Language::None,
+        )])
+        .await,
+        AHashSet::from_iter([100])
+    );
+    assert_eq!(
+        query(vec![SearchFilter::has_text(
+            TracingSearchField::Keywords,
+            "relay.example.net",
+            Language::None,
+        )])
+        .await,
+        AHashSet::from_iter([101])
+    );
+
+    for id in [100u64, 101] {
+        store
+            .unindex(
+                SearchQuery::new(SearchIndex::Tracing)
+                    .with_filter(SearchFilter::eq(SearchField::Id, id)),
+            )
+            .await
+            .unwrap();
+    }
+}
+
+// inbuxa: the message indexer passes each display name and each address of
+// From/To/Cc/Bcc as keyword text (Language::None). The built-in index splits
+// that text into words, so an address is found by its full form, its local
+// part, its domain or a display-name word; PostgreSQL kept the whole address
+// as one token and MySQL dropped stopwords such as "com" and words under three
+// characters. The expected results below are the built-in (RocksDB/SQLite)
+// results and must be the same on every backend.
+async fn test_address_search(store: SearchStore) {
+    const ACCOUNT_ID: u32 = 7;
+    let messages: [[&[(&str, &str)]; 4]; 5] = [
+        // From, To, Cc, Bcc
+        [
+            &[("Amazon.com", "[email protected]")],
+            &[("Jane Doe", "[email protected]")],
+            &[],
+            &[],
+        ],
+        [
+            &[("", "[email protected]")],
+            &[("", "[email protected]")],
+            &[("Jane Doe", "[email protected]")],
+            &[],
+        ],
+        [
+            &[("GitHub", "[email protected]")],
+            &[("Jo Li", "[email protected]")],
+            &[],
+            &[("Audit", "[email protected]")],
+        ],
+        [
+            &[("Jane Doe", "[email protected]")],
+            &[("Amazon Web Services", "[email protected]")],
+            &[("Bob", "[email protected]")],
+            &[("", "[email protected]")],
+        ],
+        [
+            &[("Newsletter", "[email protected]")],
+            &[("", "[email protected]")],
+            &[],
+            &[],
+        ],
+    ];
+    let fields = [
+        EmailSearchField::From,
+        EmailSearchField::To,
+        EmailSearchField::Cc,
+        EmailSearchField::Bcc,
+    ];
+
+    let mut documents = Vec::new();
+    let mut mask = RoaringBitmap::new();
+    for (document_id, message) in messages.iter().enumerate() {
+        let mut document = IndexDocument::new(SearchIndex::Email)
+            .with_account_id(ACCOUNT_ID)
+            .with_document_id(document_id as u32);
+        for (field, addresses) in fields.iter().zip(message.iter()) {
+            for (name, address) in addresses.iter() {
+                if !name.is_empty() {
+                    document.index_text(field.clone(), name, Language::None);
+                }
+                document.index_text(field.clone(), address, Language::None);
+            }
+        }
+        document.index_unsigned(EmailSearchField::ReceivedAt, document_id as u64);
+        documents.push(document);
+        mask.insert(document_id as u32);
+    }
+    store.index(documents).await.unwrap();
+    if let SearchStore::ElasticSearch(store) = &store {
+        store.refresh_index(SearchIndex::Email).await.unwrap();
+    }
+
+    for (field, text, expected) in [
+        // full address
+        (EmailSearchField::From, "[email protected]", vec![0u32]),
+        (EmailSearchField::To, "[email protected]", vec![0]),
+        (EmailSearchField::Cc, "[email protected]", vec![1]),
+        (EmailSearchField::Bcc, "[email protected]", vec![3]),
+        (EmailSearchField::To, "[email protected]", vec![1, 2]),
+        // local part
+        (EmailSearchField::From, "noreply", vec![0, 2]),
+        (EmailSearchField::To, "jo", vec![1, 2]),
+        (EmailSearchField::Cc, "bob", vec![3]),
+        (EmailSearchField::Bcc, "audit", vec![2]),
+        // domain
+        (EmailSearchField::From, "amazon.com", vec![0, 1]),
+        (EmailSearchField::From, "amazon", vec![0, 1]),
+        (EmailSearchField::To, "example.org", vec![0, 4]),
+        (EmailSearchField::To, "io.de", vec![1, 2]),
+        (EmailSearchField::Cc, "example.net", vec![3]),
+        (EmailSearchField::Bcc, "example.org", vec![2]),
+        (EmailSearchField::From, "www.example.com", vec![4]),
+        (EmailSearchField::From, "com", vec![0, 1, 2, 4]),
+        // display name
+        (EmailSearchField::From, "Jane", vec![3]),
+        (EmailSearchField::From, "jane doe", vec![3]),
+        (EmailSearchField::To, "Web Services", vec![3]),
+        (EmailSearchField::To, "Li", vec![2]),
+        (EmailSearchField::Cc, "Doe", vec![1]),
+        (EmailSearchField::Bcc, "Audit", vec![2]),
+        // hyphenated local part
+        (EmailSearchField::From, "shipment-tracking", vec![1]),
+        (EmailSearchField::From, "tracking", vec![1]),
+        // no match
+        (EmailSearchField::From, "amazon.org", vec![]),
+        (EmailSearchField::To, "noreply", vec![]),
+        (EmailSearchField::Bcc, "jane", vec![]),
+    ] {
+        let ids = store
+            .query_account(
+                SearchQuery::new(SearchIndex::Email)
+                    .with_filters(vec![
+                        SearchFilter::eq(SearchField::AccountId, ACCOUNT_ID),
+                        SearchFilter::has_keyword(field.clone(), text),
+                    ])
+                    .with_comparator(SearchComparator::ascending(EmailSearchField::ReceivedAt))
+                    .with_mask(mask.clone()),
+            )
+            .await
+            .unwrap();
+        assert_eq!(ids, expected, "{field:?} {text:?}");
+    }
+
+    // TEXT-style search across all address fields
+    let ids = store
+        .query_account(
+            SearchQuery::new(SearchIndex::Email)
+                .with_filters(vec![
+                    SearchFilter::eq(SearchField::AccountId, ACCOUNT_ID),
+                    SearchFilter::Or,
+                    SearchFilter::has_keyword(EmailSearchField::From, "example.org"),
+                    SearchFilter::has_keyword(EmailSearchField::To, "example.org"),
+                    SearchFilter::has_keyword(EmailSearchField::Cc, "example.org"),
+                    SearchFilter::has_keyword(EmailSearchField::Bcc, "example.org"),
+                    SearchFilter::End,
+                ])
+                .with_comparator(SearchComparator::ascending(EmailSearchField::ReceivedAt))
+                .with_mask(mask.clone()),
+        )
+        .await
+        .unwrap();
+    assert_eq!(ids, vec![0, 1, 2, 3, 4]);
+
+    store
+        .unindex(
+            SearchQuery::new(SearchIndex::Email)
+                .with_filter(SearchFilter::eq(SearchField::AccountId, ACCOUNT_ID)),
+        )
+        .await
+        .unwrap();
+}

tests/src/store/task_locks.rs

@@ -0,0 +1,184 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! Task locks across nodes: tasks claimed by a node that then disappears
+//! run elsewhere once its locks expire, and a node that stops gracefully
+//! hands its locks back at once. The other node is played by writing its
+//! locks straight into the shared in-memory store, as a node that claimed
+//! the tasks and died leaves them.
+
+use crate::utils::server::TestServerBuilder;
+use common::{KV_LOCK_TASK, Server};
+use registry::schema::{
+    enums::IndexDocumentType,
+    structs::{Task, TaskIndexDocument, TaskStatus},
+};
+use services::task_manager::lock::{TaskLockManager, release_task_locks};
+use std::time::{Duration, Instant};
+use store::{
+    ValueKey,
+    write::{BatchBuilder, TaskQueueClass, ValueClass},
+};
+use utils::snowflake::SnowflakeIdGenerator;
+
+// Short enough for a test, long enough that the recheck interval (a twelfth
+// of it) is well below it
+const LOCK_EXPIRY: u64 = 12;
+
+#[tokio::test(flavor = "multi_thread")]
+pub async fn task_lock_tests() {
+    let test = TestServerBuilder::new("task_lock_tests")
+        .await
+        .build()
+        .await;
+    let server = test.server.clone();
+    println!(
+        "Running task lock tests on {}...",
+        std::env::var("STORE").unwrap_or_default()
+    );
+    server.inner.ipc.task_locks.set_expiry(LOCK_EXPIRY);
+
+    // 1. Another node claimed the tasks and died. Its locks block them until
+    // they expire; then this node runs them, without waiting for anything
+    // else to wake it
+    let ids = new_task_ids(4);
+    for id in &ids {
+        assert!(foreign_lock(&server, *id, LOCK_EXPIRY).await);
+    }
+    schedule(&server, &ids).await;
+    let started = Instant::now();
+    server.notify_task_queue();
+    tokio::time::sleep(Duration::from_secs(3)).await;
+    assert_eq!(pending(&server, &ids).await, ids.len(), "held by the other node");
+    wait_until_done(&server, &ids, Duration::from_secs(LOCK_EXPIRY + 10)).await;
+    let elapsed = started.elapsed();
+    assert!(
+        elapsed >= Duration::from_secs(LOCK_EXPIRY - 2),
+        "ran before the other node's locks expired: {elapsed:?}"
+    );
+
+    // 2. The other node's locks outlive what this node expects: claimed just
+    // after this node looked, or by a node whose clock runs ahead. This node
+    // keeps checking at the recheck interval, so the tasks run soon after
+    // those locks expire, not a whole lock lifetime later
+    let held_for = LOCK_EXPIRY + LOCK_EXPIRY / 2;
+    let ids = new_task_ids(4);
+    for id in &ids {
+        assert!(foreign_lock(&server, *id, held_for).await);
+    }
+    schedule(&server, &ids).await;
+    let started = Instant::now();
+    server.notify_task_queue();
+    wait_until_done(&server, &ids, Duration::from_secs(held_for + 8)).await;
+    let elapsed = started.elapsed();
+    assert!(
+        elapsed >= Duration::from_secs(held_for - 2),
+        "ran before the other node's locks expired: {elapsed:?}"
+    );
+
+    // 3. A graceful stop releases the locks this node holds: another node
+    // can claim those tasks at once, and this one claims nothing more
+    let ids = new_task_ids(3);
+    for id in &ids {
+        assert!(server.try_lock_task(*id).await, "claim {id}");
+    }
+    assert_eq!(server.inner.ipc.task_locks.held(), ids.len());
+    for id in &ids {
+        assert!(
+            !foreign_lock(&server, *id, LOCK_EXPIRY).await,
+            "held while this node runs"
+        );
+    }
+    assert_eq!(release_task_locks(&server).await, ids.len());
+    assert_eq!(server.inner.ipc.task_locks.held(), 0);
+    for id in &ids {
+        assert!(
+            foreign_lock(&server, *id, LOCK_EXPIRY).await,
+            "released on stop: {id}"
+        );
+    }
+    let [id] = new_task_ids(1)[..] else {
+        unreachable!()
+    };
+    assert!(!server.try_lock_task(id).await, "a stopping node claims nothing");
+
+    for id in ids {
+        let _ = server
+            .in_memory_store()
+            .remove_lock(KV_LOCK_TASK, &id.to_be_bytes())
+            .await;
+    }
+    if test.is_reset() {
+        test.temp_dir.delete();
+    }
+}
+
+fn new_task_ids(count: usize) -> Vec<u64> {
+    (0..count)
+        .map(|_| SnowflakeIdGenerator::global_id().unwrap())
+        .collect()
+}
+
+/// The other node's claim on a task, as its task manager takes it.
+async fn foreign_lock(server: &Server, id: u64, seconds: u64) -> bool {
+    server
+        .in_memory_store()
+        .try_lock(KV_LOCK_TASK, &id.to_be_bytes(), seconds)
+        .await
+        .unwrap()
+}
+
+/// Unindex tasks for files that don't exist: files aren't search-indexed and
+/// there is no undelete note, so running one only drops it from the queue.
+async fn schedule(server: &Server, ids: &[u64]) {
+    let mut batch = BatchBuilder::new();
+    for (n, id) in ids.iter().enumerate() {
+        batch.schedule_task_with_id(
+            *id,
+            Task::UnindexDocument(TaskIndexDocument {
+                account_id: 0u32.into(),
+                document_id: (u32::MAX - n as u32).into(),
+                document_type: IndexDocumentType::File,
+                status: TaskStatus::now(),
+            }),
+        );
+    }
+    server.store().write(batch.build_all()).await.unwrap();
+}
+
+async fn pending(server: &Server, ids: &[u64]) -> usize {
+    let mut count = 0;
+    for id in ids {
+        if server
+            .store()
+            .get_value::<Task>(ValueKey::from(ValueClass::TaskQueue(
+                TaskQueueClass::Task { id: *id },
+            )))
+            .await
+            .unwrap()
+            .is_some()
+        {
+            count += 1;
+        }
+    }
+    count
+}
+
+async fn wait_until_done(server: &Server, ids: &[u64], within: Duration) {
+    let started = Instant::now();
+    loop {
+        let left = pending(server, ids).await;
+        if left == 0 {
+            return;
+        }
+        assert!(
+            started.elapsed() < within,
+            "{left} task(s) still pending after {:?}",
+            started.elapsed()
+        );
+        tokio::time::sleep(Duration::from_millis(250)).await;
+    }
+}

tests/src/system/monitoring.rs

@@ -148,6 +148,73 @@ pub async fn test(test: &mut TestServer) {
         "test 9: to"
     );
 
+    // MON-16: the queueId filter finds the traces that name a queue id (the
+    // session that queued the message and its delivery attempt) through the
+    // search index, given as a string or a number (the index column is an
+    // integer)
+    fn queue_ids(value: &Value, out: &mut Vec<u64>) {
+        match value {
+            Value::Object(map) => {
+                if map.get("key").and_then(|k| k.as_str()) == Some("queueId")
+                    && let Some(id) = map
+                        .get("value")
+                        .and_then(|v| v.get("value").unwrap_or(v).as_u64())
+                {
+                    out.push(id);
+                }
+                map.values().for_each(|v| queue_ids(v, out));
+            }
+            Value::Array(list) => list.iter().for_each(|v| queue_ids(v, out)),
+            _ => {}
+        }
+    }
+    let with_ids = traces
+        .iter()
+        .map(|t| {
+            let mut ids = Vec::new();
+            queue_ids(t, &mut ids);
+            (t["id"].as_str().unwrap().to_string(), ids)
+        })
+        .collect::<Vec<_>>();
+    let queue_id = with_ids
+        .iter()
+        .find_map(|(_, ids)| ids.first().copied())
+        .expect("MON-16: a trace with a queue id");
+    let mut expected = with_ids
+        .iter()
+        .filter(|(_, ids)| ids.contains(&queue_id))
+        .map(|(id, _)| id.clone())
+        .collect::<Vec<_>>();
+    expected.sort();
+    for filter in [json!(queue_id.to_string()), json!(queue_id)] {
+        let response = admin
+            .jmap_method_call("x:Trace/query", json!({"filter": {"queueId": filter}}))
+            .await;
+        let mut found = response
+            .0
+            .pointer("/methodResponses/0/1/ids")
+            .and_then(|ids| ids.as_array())
+            .map(|ids| {
+                ids.iter()
+                    .filter_map(|id| id.as_str().map(str::to_string))
+                    .collect::<Vec<_>>()
+            })
+            .unwrap_or_default();
+        found.sort();
+        assert_eq!(found, expected, "MON-16: queueId {filter}: {response:?}");
+    }
+    let response = admin
+        .jmap_method_call(
+            "x:Trace/query",
+            json!({"filter": {"queueId": (queue_id ^ 0x5a5a_5a5a).to_string()}}),
+        )
+        .await;
+    assert_eq!(
+        response.0.pointer("/methodResponses/0/1/ids"),
+        Some(&json!([])),
+        "MON-16: an unknown queue id"
+    );
+
     // Acceptance test 24: destroy removes a trace; create is refused
     let trace_id = traces[0]["id"].as_str().unwrap().to_string();
     let response = admin