> Complete content index: https://sirannon.sondelali.com/llms.txt

# Configuration reference

> Every option the registry, a database, the backup cycle, the server, the client, the device sync controller, and the replication engine accept, with its type and its default.

URL: https://sirannon.sondelali.com/docs/configuration
Section: Operations
Version: 0.3 (@delali/sirannon-db@0.3.0, latest)

This page lists every option Sirannon accepts, grouped by the object that takes it. The guides explain what each one is for; this page is where you check a name, a type, or a default without reading a guide first.

An option marked required has no default and the call fails without it. An option with a dash for its default is absent unless you set it, and the description says what Sirannon does in its absence.

## Opening databases

### `SirannonOptions`

Passed to `new Sirannon(options)`. See [getting started](/docs/getting-started).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `driver` | `SQLiteDriver` | required | The driver adapter for your runtime. |
| `hooks` | `HookConfig` | - | Before and after hooks for queries, connections, and subscriptions. |
| `metrics` | `MetricsConfig` | - | Callbacks for query timing, connection events, and change-capture activity. |
| `lifecycle` | `LifecycleConfig` | - | Automatic opening, idle timeout, and a cap on databases open at once. |
| `migrations` | `MigrationSource` | - | A migration set, or a function returning one, applied to every writable database before it registers. |
| `writerWorker` | `boolean \| WriterWorkerOptions` | - | The writer-worker setting every database this registry opens inherits. |

### `LifecycleConfig`

See [hooks, metrics, and lifecycle](/docs/hooks-metrics-and-lifecycle).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `autoOpen.resolver` | `(id: string) => { path, options? } \| undefined` | - | Resolves an unknown identifier to a file path, which is how a tenant opens on first access. |
| `idleTimeout` | `number` | `0` | Milliseconds before an idle database closes. Zero disables the timer. |
| `maxOpen` | `number` | `0` | Databases open at once before the least recently used one closes. Zero leaves the count unbounded. |

`createTenantResolver` builds a resolver from a `basePath`, an optional file `extension`, and `defaultOptions` applied to every tenant it opens.

### `DatabaseOptions`

Passed to `sirannon.open(id, path, options)`.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `readOnly` | `boolean` | `false` | Open the database read-only, which refuses every write. |
| `readPoolSize` | `number` | `4` | Read connections the pool holds, on a driver that supports several connections. |
| `walMode` | `boolean` | `true` | Whether to enable write-ahead logging. |
| `synchronous` | `'off' \| 'normal' \| 'full' \| 'extra'` | `'normal'` | Writer durability through `PRAGMA synchronous`. A [bulk load](/docs/bulk-load) restores this level when it finishes. |
| `cdcPollInterval` | `number` | `50` | Milliseconds between [change capture](/docs/change-data-capture) polls. |
| `cdcRetention` | `number` | `3600000` | Milliseconds change history stays available to replay. |
| `writerWorker` | `boolean \| WriterWorkerOptions` | `false` | Run writes on a dedicated thread. See [writer worker](/docs/writer-worker). |
| `backups` | `BackupCycleOptions` | - | Capture this database's write-ahead log to a destination on an interval. See [continuous backups](/docs/backup-chains). |

### `WriterWorkerOptions`

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `maxPendingWrites` | `number` | `1024` | Writes in flight before new writes are refused with `WRITE_OVERLOADED`. |
| `writeTimeoutMs` | `number` | `30000` | Per-operation deadline in milliseconds. Zero disables it. |
| `maxRestarts` | `number` | `5` | Respawns allowed after the worker crashes, before writes fail with `WRITER_WORKER_FATAL`. |

### `OpenOptions`

Passed to `driver.open(path, options)` and to `ConnectionPool.create`, which application code reaches only when it opens a connection outside a `Sirannon` registry.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `readonly` | `boolean` | `false` | Open the connection read-only. |
| `walMode` | `boolean` | `true` | Whether to enable write-ahead logging. |
| `synchronous` | `SynchronousLevel` | `'normal'` | Writer durability the connection runs at. |
| `walAutoCheckpoint` | `number` | - | Frames the log may reach before SQLite checkpoints it on its own. Zero turns that off, which a database capturing its own log needs, and `sirannon.open` sets it to zero for you whenever `backups` is present. |

## Running statements

### `QueryOptions`

Passed per call to `query`, `execute`, `executeBatch`, and a registered operation.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `readConcern` | `{ level: 'local' \| 'majority' \| 'linearizable' }` | - | How current the read must be. Coordinator mode enforces it and static mode ignores it. |
| `writeConcern` | `{ level, timeoutMs? }` | a local commit in static mode, `'majority'` in coordinator mode | How many nodes must acknowledge the write. `timeoutMs` defaults to 5,000. |

### `BulkLoadOptions`

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `durability` | `'off' \| 'normal'` | `'off'` | Durability in force while the load runs. |
| `checkpoint` | `boolean` | `true` | Whether the load ends with a checkpoint. A database opened with `backups` runs none whatever you set. |

### `LiveQueryOptions`

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `rereadJitterMs` | `number` | `25` | Upper bound on the random delay before a second read starts. |
| `maxTransactionChanges` | `number` | `10000` | Buffered changes in one transaction before the query reads a second time. |

Both options reach a local `db.live` only, because a remote subscription sends no options and the server opens the query with these defaults. `UseLiveQueryOptions` in the React entry adds `enabled`, which holds a query closed while it is `false`.

## Backups

### `BackupCycleOptions`

Passed as `backups` in `DatabaseOptions`. See [continuous backups](/docs/backup-chains).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `destination` | `BackupDestination` | required | Where the full copy, the change pieces, and the chain records go. |
| `intervalMs` | `number` | `60000` | Milliseconds between captures. Zero means the cycle takes a turn only when you call `captureBackupChanges`. |
| `fullCopyIntervalMs` | `number` | `86400000` | Milliseconds a chain runs before a fresh full copy starts a new one. |
| `chainName` | `string` | `'sirannon-backup-chain'` | Name the destination stores the list of chains under. |
| `namePrefix` | `string` | `'sirannon-backup'` | What each backup is named after at the destination. |
| `pieceBytes` | `number` | `16777216` | Bytes one whole piece holds. A streamed copy needs a multiple of 512. |
| `fingerprint` | `boolean` | `true` | Whether each backup records a SHA-256 of what it wrote. |
| `stagingDir` | `string` | a directory beside the database file | Where a capture waits before it goes out. |
| `maxUncapturedLogBytes` | `number` | unbounded | Bytes the write-ahead log may reach across turns that capture nothing. |
| `replicationGroup` | `BackupGroupSource` | - | Where this node reads its group's membership. See [backups in a replication group](/docs/backups-in-a-cluster). |
| `preferredNode` | `'replica' \| 'primary' \| { nodeId }` | `'replica'` | Which node of that group takes the backups. |
| `pagesPerStep` | `number` | `256` | Pages SQLite moves in one step of the full copy. |
| `restartLimit` | `number` | `3` | Restarts the full copy absorbs before it fails with `BACKUP_RESTARTED`. |
| `noProgressStepLimit` | `number` | `256` | Steps the copy may take without reaching a page it had not already copied. |
| `stallTimeoutMs` | `number` | `30000` | Milliseconds the copy may move no pages before it fails with `BACKUP_STALLED`. |
| `destinationTimeoutMs` | `number` | `600000` | Milliseconds one call to the destination may take. Zero leaves the calls unbounded. |
| `onRun` | `(report: BackupRunReport) => void` | - | Called with the report of every backup the cycle finishes. |
| `onProgress` | `(progress: BackupProgress) => void` | - | Called at step resolution while a turn proceeds. |
| `onSkip` | `(skip: BackupSkip) => void` | - | Called with every turn the cycle passed over, and what it passed it over for. |
| `onError` | `(error: Error) => void` | - | Called when a capture, a transfer, or a checkpoint fails. Set it. |

### `BackupToDestinationOptions`

Passed to `db.backupTo(options)`. See [backup destinations](/docs/backup-destinations).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `destination` | `BackupDestination` | required | Where the pieces go and where a restore reads them from. |
| `name` | `string` | `backup-{ISO timestamp}.db` | Name the pieces are stored under. |
| `chainId` | `string` | an identifier the run mints | The chain this copy begins. |
| `pieceBytes` | `number` | `16777216` | Bytes one whole piece holds. |
| `fingerprint` | `boolean` | `true` | Whether the run folds a SHA-256 over what it wrote. |
| `pagesPerStep` | `number` | `256` | Pages SQLite moves in one step. |
| `restartLimit` | `number` | `3` | Restarts the copy absorbs before it fails. |
| `noProgressStepLimit` | `number` | `256` | Steps the copy may take without reaching a new page. |
| `stallTimeoutMs` | `number` | `30000` | Milliseconds the copy may move no pages. |
| `destinationTimeoutMs` | `number` | `600000` | Milliseconds one call to the destination may take. |
| `stagingDir` | `string` | the host temporary directory | Directory the staged route writes its local file in. |
| `onProgress` | `(progress: BackupProgress) => void` | - | Called during the copy and once per piece during the transfer. |

### `BackupScheduleOptions`

Passed to `db.scheduleBackup(options)`. See [backups](/docs/backups).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `cron` | `string` | required | Five fields for minute resolution, or six to add seconds at the front. |
| `destDir` | `string` | required | Directory each copy is written into. |
| `maxFiles` | `number` | `5` | Copies matching `backup-*.db` to keep, by modification time. |
| `timezone` | `string` | the host zone | IANA name the cron expression is read in. |
| `onBackup` | `(report: BackupFileReport) => void \| Promise<void>` | - | Called after every finished copy, before the older files are cleared. |
| `onBackupTimeoutMs` | `number` | `600000` | Milliseconds Sirannon waits for `onBackup`. Zero leaves the wait unbounded. |
| `onError` | `(error: Error) => void` | - | Called with every failure. Set it. |

### `BackupRestoreOptions`

Passed to `restoreBackup(options)` from `@delali/sirannon-db/backup`. See [restoring a database](/docs/backup-restore).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `destination` | `BackupDestination` | required | Where the backups and their records are stored. |
| `driver` | `SQLiteDriver` | required | Driver the restore opens the rebuilt database through. |
| `destPath` | `string` | required | Path the rebuilt database is written to. |
| `moment` | `number` | now | Epoch milliseconds you want back. |
| `chainName` | `string` | `'sirannon-backup-chain'` | Name the list of chains is stored under. |
| `replaceExisting` | `boolean` | `false` | Whether to replace a database already at that path. |
| `batchSize` | `number` | `16` | Change pieces replayed between one checkpoint and the next, up to 4,096. |
| `destinationTimeoutMs` | `number` | `600000` | Milliseconds one call to the destination may take. |
| `onProgress` | `(progress: BackupRestoreProgress) => void` | - | Called after every piece the restore fetches. |

## Serving over the network

### `ServerOptions`

Passed to `createServer(sirannon, options)`. See [server](/docs/server).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `host` | `string` | `'127.0.0.1'` | Bind address. |
| `port` | `number` | `9876` | Listen port. |
| `cors` | `boolean \| CorsOptions` | `false` | Cross-origin configuration. |
| `maxBodyBytes` | `number` | `1048576` | Largest HTTP body and WebSocket message, as a positive integer no larger than 4,294,967,295. |
| `maxWebSocketBackpressureBytes` | `number` | the larger of `16777216` and `maxBodyBytes` | Bytes buffered per connection before the server closes it. |
| `cdcRetentionMs` | `number` | `3600000` | Milliseconds change events stay available, which bounds how far back `sinceSeq` resumes. |
| `deviceCursorRetentionMs` | `number` | `2592000000` | Milliseconds an idle device cursor lasts, 30 days by default. |
| `maxUnacknowledgedChanges` | `number` | `1000` | How far a device may run past its acknowledged sequence before delivery pauses. |
| `authenticate` | `AuthenticateHook<Identity>` | - | Runs before every database route and WebSocket upgrade. |
| `operations` | `OperationRegistry<Identity>` | - | Reads and writes this server serves by name, keyed by database identifier. |
| `acceptSql` | `boolean` | `false` | Whether the server accepts SQL statements over the network. |
| `acceptBackupRestore` | `boolean` | `false` | Whether the server rebuilds a database from its backups over the network. A server that sets it without `authenticate` refuses to start, with `INVALID_BACKUP_RESTORE`. |
| `resolveExecutionTarget` | `ServerExecutionTargetResolver` | - | Resolves the target each database runs against, which is how replication enforces authority. |
| `getReplicationStatus` | `() => ReplicationStatusInfo \| null` | - | Feeds `GET /health/ready` with replication state. |
| `getClusterStatus` | `(databaseId: string) => ClusterStatusInfo \| null` | - | Feeds `GET /db/{id}/cluster` with routing metadata. |
| `authorizeClusterStatus` | `ClusterStatusAuthorizer` | - | Your check for whether a request may read cluster status, which names every node address. |

### `ClientOptions`

Passed to `new SirannonClient(url, options)`. See [client SDK](/docs/client-sdk).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `transport` | `'websocket' \| 'http'` | `'websocket'` | Transport the client uses. |
| `headers` | `Record<string, string>` | - | Headers on HTTP requests, and on the WebSocket upgrade under Node and Bun. A browser client that sets it without `webSocketProtocols` on the WebSocket transport fails with `INVALID_ARGUMENT`. |
| `webSocketProtocols` | `string \| string[]` | - | Subprotocols offered during the upgrade, which is how a browser sends a credential. The client offers `sirannon.v1` ahead of them. |
| `autoReconnect` | `boolean` | `true` | Whether to reconnect after a WebSocket disconnect. |
| `reconnectInterval` | `number` | `1000` | Reconnect delay in milliseconds. |
| `requestTimeout` | `number` | `30000` | Per-request timeout in milliseconds on the WebSocket transport. Zero waits indefinitely. |

### `TopologyAwareClientOptions`

Accepted by `TopologyAwareClient` from `@delali/sirannon-db/client/topology`, alongside every `ClientOptions` field. `SirannonClient` refuses each of these with `INVALID_ARGUMENT`. See [topology-aware routing](/docs/topology-routing).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `endpoints` | `string[]` | - | Starter list that coordinator mode queries for routing metadata. |
| `primary` | `string` | - | Primary endpoint used directly in static mode. |
| `replicas` | `string[]` | - | Replica endpoints used directly in static mode. |
| `readPreference` | `'primary' \| 'replica' \| 'nearest'` | `'primary'` | Which node serves a read. |
| `discovery` | `'static' \| 'coordinator'` | `'static'` | Whether routing comes from your configuration or from `GET /db/{id}/cluster`. |
| `readConcern` | `'local' \| 'majority' \| 'linearizable'` | `'majority'` in coordinator mode | Client-wide read concern applied to node selection. |

### `LoadAllOptions`

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `batchSize` | `number` | `1000` | Rows per request. Each batch has to fit under the server's `maxBodyBytes`. |
| `durability` | `'off' \| 'normal'` | `'off'` | Durability in force on the server while each batch loads. |

## Device sync

### `SyncControllerOptions`

Passed to `new SyncController(db, options)`. See [device sync](/docs/device-sync).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `url` | `string` | required | Base URL of the server. |
| `databaseId` | `string` | required | Database to sync against, under the identifier the server opened it with. |
| `tables` | `readonly string[]` | required | Tables the device syncs. |
| `headers` | `Record<string, string>` | - | Headers on push, snapshot, and migration requests, and on the pull upgrade under Node and Bun. |
| `webSocketProtocols` | `string \| string[]` | - | Subprotocols offered on the pull upgrade, which is how a browser device sends a credential. |
| `batchSize` | `number` | `100` | Changes per push request. |
| `pushIntervalMs` | `number` | `1000` | Push loop interval, which is also the base for retry backoff. |
| `ackIntervalMs` | `number` | `2000` | Milliseconds between the device's acknowledgements of applied changes. |
| `maxPushRetryDelayMs` | `number` | `30000` | Ceiling for push and pull retry backoff. |
| `requestTimeout` | `number` | `30000` | HTTP request timeout in milliseconds. |
| `autoResync` | `boolean` | `true` | Whether to download a snapshot on start, on a server resync signal, and after a failed download. |
| `snapshotRetryDelayMs` | `number` | `5000` | First delay before retrying a failed snapshot. |
| `maxSnapshotRetryDelayMs` | `number` | `300000` | Ceiling for snapshot retry backoff. |
| `snapshotPageSize` | `number` | `500` | Rows per snapshot page. |
| `immediateAckAfterChanges` | `number` | half the server's window | Outstanding changes that trigger an immediate acknowledgement. |
| `resolver` | `ConflictResolver \| ((table: string) => ConflictResolver)` | `LWWResolver` | Conflict resolution for pulled changes. |
| `onChange` | `(event: ChangeEvent) => void` | - | Called for each pulled change after it commits locally. |
| `onStatusChange` | `(status: SyncStatus) => void` | - | Called with the device's status on a state change, a push, an applied pull batch, a required resync, and an error recorded or cleared. |
| `onResyncRequired` | `() => void` | - | Called before a snapshot replaces local data. |
| `onSnapshotProgress` | `(progress: SnapshotProgress) => void` | - | Table and row progress during a snapshot. |
| `onSnapshotComplete` | `(outcome: SnapshotOutcome) => void` | - | Called once a snapshot load ends, reporting whether the local database is usable again. |

### `SnapshotDownloadOptions`

Accepted by `downloadDatabaseSnapshot(db.deviceSync(), options)`, which copies a server database into a local one outside a `SyncController`. See [device sync recovery](/docs/device-sync-recovery).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `url` | `string` | required | Base URL of the server. |
| `databaseId` | `string` | required | Database to copy. |
| `headers` | `Record<string, string>` | - | Headers sent on the manifest and page requests. |
| `pageSize` | `number` | `500` | Rows per snapshot page. |
| `requestTimeoutMs` | `number` | `30000` | Per-request timeout in milliseconds. |
| `onProgress` | `(progress: SnapshotProgress) => void` | - | Table and row progress during the copy. |

## Replication

### `ReplicationOptions`

Passed to `new ReplicationEngine(db, writerConn, options)`. See [distributed replication](/docs/distributed-replication).

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `nodeId` | `string` | generated in static mode | Node identifier. Coordinator mode needs a stable, persisted value. |
| `topology` | `Topology` | required | The topology this node runs under, such as `PrimaryReplicaTopology`. |
| `transport` | `ReplicationTransport` | required | Transport for node-to-node traffic. |
| `transportConfig` | `TransportConfig` | `{}` | Peer endpoints and transport metadata. |
| `writeForwarding` | `boolean` | `false` | Whether a replica forwards writes to the primary. |
| `defaultConflictResolver` | `ConflictResolver` | `LWWResolver` | Default conflict resolution. |
| `conflictResolvers` | `Record<string, ConflictResolver>` | - | Per-table conflict resolution overrides. |
| `batchSize` | `number` | `100` | Changes per replication batch. |
| `batchIntervalMs` | `number` | `100` | Sender loop interval in milliseconds. |
| `maxClockDriftMs` | `number` | `60000` | Largest clock gap between two nodes this node accepts before it rejects a batch. |
| `maxPendingBatches` | `number` | `10` | In-flight batches per peer before back-pressure. |
| `maxBatchChanges` | `number` | `1000` | Changes accepted in one inbound batch. |
| `ackTimeoutMs` | `number` | `5000` | Batch acknowledgement timeout in milliseconds. |
| `initialSync` | `boolean` | `true` | Whether to pull a full snapshot when joining a cluster. |
| `syncBatchSize` | `number` | `10000` | Rows per batch during first sync. |
| `maxConcurrentSyncs` | `number` | `2` | Simultaneous sync sessions the source serves. |
| `maxSyncDurationMs` | `number` | `1800000` | Milliseconds before the source abandons a sync. |
| `maxSyncLagBeforeReady` | `number` | `100` | Catch-up lag, in sequences, at which a node reaches ready. |
| `syncAckTimeoutMs` | `number` | `30000` | Per-batch acknowledgement timeout during sync. |
| `catchUpDeadlineMs` | `number` | `600000` | Milliseconds in catch-up before a node moves to ready. |
| `resumeFromSeq` | `bigint` | - | Sequence to start replication from, for an out-of-band sync. |
| `snapshotConnectionFactory` | `() => Promise<SQLiteConnection>` | - | Opens the read-only connections a source serves a sync from. |
| `changeTracker` | `ChangeTracker` | - | Change-capture trigger manager, which first sync needs. |
| `flowControl` | `{ maxLagSeconds?, onLagExceeded? }` | - | Replication lag monitoring callbacks. |
| `onBeforeForwardedQuery` | `(sql, params?) => void` | - | Validation hook the primary runs before each forwarded statement. |
| `coordinator` | `CoordinatorModeConfig` | - | Turns on coordinator-backed authority and failover. |

### `CoordinatorModeConfig`

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `clusterId` | `string` | required | Coordinator namespace for the cluster. |
| `groupId` | `string` | required | Replication group holding copies of one database. |
| `endpoint` | `string` | - | Application endpoint advertised for client discovery. |
| `votingDataBearingNodeIds` | `string[]` | - | Voter set used to create an unregistered group and to calculate write concerns. |
| `coordinator` | `ClusterCoordinator` | required | Coordinator adapter, such as the etcd one. |
| `sessionTtlMs` | `number` | `10000` | Node-session lease lifetime in milliseconds. |
| `controller` | `boolean \| CoordinatorControllerConfig` | enabled | Turns the controller loop on, or configures its lease holder, lifetime, and tick interval. |
| `compatibility` | `CoordinatorCompatibilityMetadata` | - | Package, specification, and protocol versions checked before promotion. |

`CoordinatorControllerConfig` accepts `enabled`, `holderId`, `leaseTtlMs` (10,000 milliseconds by default), and `tickIntervalMs` (1,000 milliseconds by default).

### `EtcdClusterCoordinatorOptions`

Accepted by `createEtcdCoordinator` from `@delali/sirannon-db/replication/coordinator/etcd`.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `hosts` | `string \| string[]` | required | etcd endpoints. Each has to use `https` unless you set `allowInsecure`. |
| `keyPrefix` | `string` | required | Key namespace this cluster writes under. |
| `credentials` | etcd credentials | - | Root certificate, private key, and certificate chain for mutual TLS. |
| `auth` | etcd auth | - | Username and password authentication. |
| `grpcOptions` | `Record<string, unknown>` | - | Options passed through to the etcd gRPC channel. |
| `dialTimeoutMs` | `number` | the etcd client's own default | Connection timeout in milliseconds. |
| `defaultCallTimeoutMs` | `number` | - | Deadline applied to each coordinator call, in milliseconds. |
| `allowInsecure` | `boolean` | `false` | Allows plain `http` endpoints, so keep it to tests. |
| `onWatcherError` | `(error: Error) => void` | - | Called when a coordinator watcher fails. |

### `TransportConfig`

`ReplicationEngine.start()` fills in the role, the group, the term, and the protocol version. Set them yourself only when you use a `ReplicationTransport` without the engine.

| Option | Type | Description |
| --- | --- | --- |
| `endpoints` | `string[]` | Peer addresses replication connections are made to. |
| `localRole` | `'primary' \| 'replica'` | Local topology role. |
| `groupId` | `string` | Replication group named in coordinator-mode handshakes. |
| `primaryTerm` | `bigint` | Current fencing term, taken from coordinator state. |
| `protocolVersion` | `string` | Replication protocol version advertised to peers. |
| `metadata` | `Record<string, unknown>` | Custom transport metadata. |

### `GrpcReplicationOptions`

Accepted by `GrpcReplicationTransport` from `@delali/sirannon-db/transport/grpc`.

| Option | Type | Default | Description |
| --- | --- | --- | --- |
| `host` | `string` | `'0.0.0.0'` | Address this node listens on for replication traffic. |
| `port` | `number` | `0` | Listen port. Zero takes an ephemeral one. |
| `tlsCert` | `string` | - | Path to this node's certificate. |
| `tlsKey` | `string` | - | Path to this node's private key. |
| `tlsCaCert` | `string` | - | Path to the certificate authority that signs every peer. |
| `insecure` | `boolean` | `false` | Runs without TLS, so keep it to local development. |
| `forwardDeadlineMs` | `number` | `30000` | Deadline in milliseconds for a write forwarded to the primary. |