ScadaBridge/docker/site-a-node-b/appsettings.Site.json

{
  "ScadaBridge": {
    "Node": {
      "Role": "Site",
      "NodeName": "node-b",
      "NodeHostname": "scadabridge-site-a-b",
      "SiteId": "site-a",
      "RemotingPort": 8082,
      "GrpcPort": 8083,
      "MetricsPort": 8084
    },
    // Script file access (design 2026-09-28): the Files global reads only beneath these
    // roots. ./recipes is bind-mounted read-only at /app/recipes on site-a (both nodes, so
    // a failover keeps the same view); site-b/site-c stay unconfigured = Files disabled.
    "SiteRuntime": {
      "ScriptFileAccess": {
        "AllowedRoots": [ "/app/recipes" ]
      }
    },
    "Cluster": {
      "SeedNodes": [
        "akka.tcp://scadabridge@scadabridge-site-a-b:8082",
        "akka.tcp://scadabridge@scadabridge-site-a-a:8082"
      ],
      "SplitBrainResolverStrategy": "auto-down",
      "StableAfter": "00:00:15",
      "HeartbeatInterval": "00:00:02",
      "FailureDetectionThreshold": "00:00:10",
      "MinNrOfMembers": 1,
      "_bootstrapGuard": "Gitea #33 guard ENABLED on the docker rig (2026-08-02): deploy.sh recreates all containers simultaneously, which twice split site pairs into two 1-node clusters on 2026-08-01. Lower host:port founds self-first; the higher node TCP-probes then joins peer-first.",
      "BootstrapGuard": {
        "Enabled": true,
        "PartnerProbeSeconds": 25,
        "PartnerProbeIntervalMs": 500,
        "ProbeConnectTimeoutMs": 1000
      }
    },
    "DataConnection": {
      "ReconnectInterval": "00:00:05",
      "TagResolutionRetryInterval": "00:00:10",
      "WriteTimeout": "00:00:30",
      "SeedReadTimeout": "00:00:30"
    },
    "Communication": {
      // DEV-ONLY control-plane preshared key — NOT a real secret. Must be
      // IDENTICAL on both nodes of the pair and match the central-side entry in
      // ScadaBridge__Communication__SitePsks__<siteId> (docker-compose.yml).
      // Production supplies this as ${secret:SB-GRPC-PSK-<siteId>}. Without it the
      // node fails StartupValidator: the gate is fail-closed, so an unset key would
      // refuse every SiteStream call while the node still looked healthy.
      "GrpcPsk": "dev-grpc-psk-docker-site-a",
      "CentralGrpcEndpoints": [
        "http://scadabridge-central-a:8083",
        "http://scadabridge-central-b:8083"
      ],
      "DeploymentTimeout": "00:02:00",
      "LifecycleTimeout": "00:00:30",
      "QueryTimeout": "00:00:30",
      "TransportHeartbeatInterval": "00:00:05",
      "TransportFailureThreshold": "00:00:15"
    },
    "HealthMonitoring": {
      "ReportInterval": "00:00:30",
      "OfflineTimeout": "00:01:00"
    },
    "SiteEventLog": {
      "RetentionDays": 30,
      "MaxStorageMb": 1024,
      "_comment": "Retention uses the configured PurgeInterval delay after each purge; no wall-clock cron schedule is supported."
    },
    "Notification": {},
    "Logging": {
      "MinimumLevel": "Information"
    }
  },
  // Consolidated site database (LocalDb Phase 1): OperationTracking + site_events.
  // On the mounted /app/data volume so it survives container recreate - unlike the
  // legacy site-tracking.db / site_events.db, which defaulted to CWD-relative paths
  // outside the volume and were lost on every recreate.
  // Replication is opt-in and configured separately; absent = local-only.
  "LocalDb": {
    "Path": "/app/data/site-localdb.db",
    // The PASSIVE half of site-a's replicated pair: no PeerAddress, so this node's
    // sync initiator starts and idles while node-a dials in. Its own writes still
    // reach node-a - the stream is bidirectional.
    //
    // The key MUST match node-a's exactly. LocalDbSyncAuthInterceptor is
    // fail-closed, so a typo here does not degrade to unauthenticated replication;
    // it rejects every stream and the pair silently stops converging.
    "Replication": {
      "ApiKey": "dev-site-a-localdb-sync-key",
      // ---- Phase 2 sizing, from the Task 1 rig soak (not from the defaults) ----
      //
      // The old MaxBatchSize = 16 pin (a hand-computed byte-budget proxy) was retired
      // when LocalDb 0.2.0 added MaxBatchBytes (arch-review WP3.3) - but MaxBatchSize
      // is NOT purely redundant with it. MaxBatchBytes bounds the WIRE message via a
      // per-message split in SyncSession.PumpLoopAsync; MaxBatchSize separately bounds
      // the DB READ page in OplogStore.ReadBatchAboveAsync / SnapshotStreamer, which
      // materializes the whole page into memory BEFORE the byte-budget split runs. At
      // the unset 500 default, a reconnect drain of 70 KB worst-case config_json rows
      // can transiently allocate ~35 MB per read even though every wire message stays
      // under the 2 MB MaxBatchBytes default (arch-review adversarial finding F2). Pin
      // it explicitly here to bound that transient allocation; MaxBatchBytes is left
      // unset (its 2 MB default) to bound the wire message.
      "MaxBatchSize": 64,
      //
      // Backlog caps bound the oplog while the peer is offline. Exceeding them is
      // NOT data loss: the oplog is pruned to the ceiling and needs_snapshot is set,
      // so the peer catches up by snapshot resync instead of incrementally. That
      // makes tighter-than-default correct here - it trades a rare full resync for a
      // bounded file. Sized from the soak's 0.80 sf_messages rows/sec (the only
      // non-zero writer measured): ~69k rows/day, so 2 days is ~138k. 250,000 leaves
      // room for burst without approaching the 1,000,000 default.
      "MaxOplogRows": 250000,
      "MaxOplogAge": "2.00:00:00"
    }
  },
  // arch-review remediation WP1.2: the site hot-path audit writer's SQLite file has no
  // default path (mirrors LocalDb:Path above) and StartupValidator now requires it for
  // Site nodes — an unset value used to fall back to a bare "auditlog.db" resolved
  // relative to CWD, i.e. the container's ephemeral overlayfs, so the pending audit
  // backlog was silently discarded on every recreate. On the mounted /app/data volume,
  // same as LocalDb:Path, so it survives container recreate.
  "AuditLog": {
    "SiteWriter": {
      "DatabasePath": "/app/data/auditlog.db"
    }
  }
}