reddb_server/runtime/

impl_lifecycle.rs

//! Runtime bootstrap / constructor / handle accessors.
//!
//! Extracted verbatim from `impl_core.rs` (impl_core slice 8/10, issue #1629).
//! Houses the in-memory / options constructors, the ~800-line `with_pool`
//! constructor (moved verbatim — restructuring it is future work), snapshot
//! rehydration and materialized-view backing lifecycle, system keyed-collection
//! bootstrap, and the db / index-store / schema-vocabulary / auth-store /
//! oauth / browser-token / registry handle accessors.
//!
//! - **Free helpers** — `view_records_to_entities`,
//!   `system_keyed_collection_contract`, `table_row_index_fields`.
use super::impl_config_secret::seed_storage_deploy_config;
use super::*;

fn boot_cache_u64(
    store: &crate::storage::UnifiedStore,
    env: &HashMap<String, String>,
    key: &str,
    default: u64,
) -> u64 {
    if let Some(value) = env.get(key).and_then(|value| value.parse::<u64>().ok()) {
        return value;
    }
    match store.get_config(key) {
        Some(reddb_types::Value::UnsignedInteger(value)) => value,
        Some(reddb_types::Value::Integer(value)) => u64::try_from(value).unwrap_or(default),
        Some(reddb_types::Value::Text(value)) => value.parse::<u64>().unwrap_or(default),
        _ => default,
    }
}

/// Convert the rows produced by a materialized-view body into
/// `UnifiedEntity` table rows targeting the backing collection.
/// Issue #595 slice 9c — feeds `UnifiedStore::refresh_collection`.
///
/// Graph fragments and vector hits are ignored: a materialized view
/// is a relational result set (SELECT-shaped); slices 11+ may extend
/// this once we have a richer view body shape. Each row materialises
/// the union of its schema-bound columns + overflow.
pub(crate) fn view_records_to_entities(
    table: &str,
    records: &[crate::storage::query::unified::UnifiedRecord],
) -> Vec<crate::storage::UnifiedEntity> {
    use std::collections::HashMap;
    let table_arc: std::sync::Arc<str> = std::sync::Arc::from(table);
    let mut out = Vec::with_capacity(records.len());
    for record in records {
        let mut named: HashMap<String, reddb_types::Value> = HashMap::new();
        for (name, value) in record.iter_fields() {
            named.insert(name.to_string(), value.clone());
        }
        let entity = crate::storage::UnifiedEntity::new(
            crate::storage::EntityId::new(0),
            crate::storage::EntityKind::TableRow {
                table: std::sync::Arc::clone(&table_arc),
                row_id: 0,
            },
            crate::storage::EntityData::Row(crate::storage::RowData {
                columns: Vec::new(),
                named: Some(named),
                schema: None,
            }),
        );
        out.push(entity);
    }
    out
}

fn system_keyed_collection_contract(
    name: &str,
    model: crate::catalog::CollectionModel,
) -> crate::physical::CollectionContract {
    let now = crate::utils::now_unix_millis() as u128;
    crate::physical::CollectionContract {
        name: name.to_string(),
        description: None,
        description_generated: false,
        declared_model: model,
        schema_mode: crate::catalog::SchemaMode::Dynamic,
        origin: crate::physical::ContractOrigin::Implicit,
        version: 1,
        created_at_unix_ms: now,
        updated_at_unix_ms: now,
        default_ttl_ms: None,
        vector_dimension: None,
        vector_metric: None,
        context_index_fields: Vec::new(),
        declared_columns: Vec::new(),
        table_def: None,
        timestamps_enabled: false,
        context_index_enabled: false,
        metrics_raw_retention_ms: None,
        metrics_rollup_policies: Vec::new(),
        metrics_tenant_identity: None,
        metrics_namespace: None,
        append_only: false,
        subscriptions: Vec::new(),
        analytics_config: Vec::new(),
        session_key: None,
        session_gap_ms: None,
        retention_duration_ms: None,
        analytical_storage: None,

        ai_policy: None,
    }
}

pub(crate) fn table_row_index_fields(
    entity: &crate::storage::unified::entity::UnifiedEntity,
) -> Vec<(String, reddb_types::Value)> {
    let crate::storage::EntityData::Row(row) = &entity.data else {
        return Vec::new();
    };
    if let Some(named) = &row.named {
        return named
            .iter()
            .map(|(name, value)| (name.clone(), value.clone()))
            .collect();
    }
    if let Some(schema) = &row.schema {
        return schema
            .iter()
            .zip(row.columns.iter())
            .map(|(name, value)| (name.clone(), value.clone()))
            .collect();
    }
    Vec::new()
}

impl RedDBRuntime {
    pub fn in_memory() -> RedDBResult<Self> {
        Self::with_options(RedDBOptions::in_memory())
    }

    pub fn flush(&self) -> RedDBResult<()> {
        let store = self.inner.db.store();
        let publication = store.vault_publication_lock.lock();
        self.inner
            .db
            .flush_local_only()
            .map_err(|err| RedDBError::Internal(err.to_string()))?;
        self.index_store_ref().clear_paged_btree_overlays();
        drop(publication);
        if let Err(err) = self.assert_remote_write_allowed("flush") {
            tracing::warn!(
                target: "reddb::serverless::lease",
                error = %err,
                "flush: skipping remote upload — lease not held"
            );
            return Ok(());
        }
        self.publish_remote_snapshot()
    }

    /// Handle to the intent-lock manager for tests + introspection.
    /// Production code acquires via `LockerGuard::new(rt.lock_manager())`
    /// rather than touching the manager directly.
    pub fn lock_manager(&self) -> std::sync::Arc<crate::runtime::lock_manager::LockManager> {
        self.inner.lock_manager.clone()
    }

    /// Process-local governance registry for managed policy/config guardrails.
    pub fn config_registry(&self) -> std::sync::Arc<crate::auth::registry::ConfigRegistry> {
        self.inner.config_registry.clone()
    }

    pub fn query_audit(&self) -> std::sync::Arc<crate::runtime::query_audit::QueryAuditStream> {
        self.inner.query_audit.clone()
    }

    pub fn control_events_require_persistence(&self) -> bool {
        self.inner.control_event_config.require_persistence()
    }

    pub fn control_event_config(&self) -> crate::runtime::control_events::ControlEventConfig {
        self.inner.control_event_config
    }

    pub fn control_event_ledger(
        &self,
    ) -> Arc<dyn crate::runtime::control_events::ControlEventLedger> {
        self.inner.control_event_ledger.read().clone()
    }

    #[doc(hidden)]
    pub fn replace_control_event_ledger_for_tests(
        &self,
        ledger: Arc<dyn crate::runtime::control_events::ControlEventLedger>,
    ) {
        *self.inner.control_event_ledger.write() = ledger;
    }

    #[inline(never)]
    pub fn with_options(options: RedDBOptions) -> RedDBResult<Self> {
        Self::with_pool(options, ConnectionPoolConfig::default())
    }

    /// The memory budget resolved at boot (ADR 0073 §1). Immutable for the
    /// process lifetime; echoed by the boot log and the `red.stats` budget
    /// section.
    pub fn memory_budget(&self) -> crate::storage::memory_budget::MemoryBudget {
        self.inner.memory_budget
    }

    /// The one shared accounting pool (ADR 0073 §2). Per-pool shares are fixed
    /// at boot; live usage is refreshed by
    /// [`RedDBRuntime::refresh_memory_accounting`].
    pub fn memory_accounting(&self) -> &crate::storage::memory_pools::MemoryAccounting {
        &self.inner.memory_accounting
    }

    pub fn with_pool(
        options: RedDBOptions,
        pool_config: ConnectionPoolConfig,
    ) -> RedDBResult<Self> {
        Self::with_pool_and_limits(
            options,
            pool_config,
            super::resource_limits::ResourceLimits::from_env(),
        )
    }

    pub(super) fn with_pool_and_limits(
        options: RedDBOptions,
        pool_config: ConnectionPoolConfig,
        resource_limits: super::resource_limits::ResourceLimits,
    ) -> RedDBResult<Self> {
        options
            .replication
            .validate_failover_profile()
            .map_err(RedDBError::InvalidConfig)?;
        // PLAN.md Phase 9.1 — capture wall-clock before storage
        // open so the cold-start phase markers can be backfilled
        // once Lifecycle is constructed below. Storage open
        // encapsulates auto-restore + WAL replay; we treat the
        // whole window as one combined "restore" + "wal_replay"
        // phase split at the same boundary because the storage
        // layer doesn't yet emit a finer signal.
        let boot_open_start_ms = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_millis() as u64)
            .unwrap_or(0);
        // ADR 0073 §1 — resolve the one memory budget before anything is
        // opened, so a nonsensical operator value fails the boot before the
        // process touches disk. The log line fires once per process.
        let memory_budget = crate::storage::memory_budget::resolve_for_boot(
            options.storage_profile.deploy_profile,
            options.memory_budget_bytes,
        )
        .map_err(|err| RedDBError::InvalidConfig(err.to_string()))?;
        crate::storage::memory_budget::log_resolved_once(&memory_budget);
        // ADR 0073 §2 — divide the budget among the pools before any of them
        // is constructed. `BudgetShares::resolve` asserts Σ(shares) ≤ budget;
        // one boot log line per pool names its share.
        let memory_shares = crate::storage::memory_pools::BudgetShares::resolve(
            memory_budget,
            options.storage_profile.deploy_profile,
        );
        memory_shares.log_once();
        let embedded_single_file = options.storage_profile.deploy_profile
            == crate::storage::DeployProfile::Embedded
            && options.storage_profile.packaging == crate::storage::StoragePackaging::SingleFile;
        let db = Arc::new(RedDB::open_with_options(&options).map_err(|err| {
            match err.downcast::<crate::storage::StoreError>() {
                Ok(store_err) => RedDBError::from(*store_err),
                Err(err) => RedDBError::Internal(err.to_string()),
            }
        })?);
        let env_config_overrides = crate::runtime::config_overlay::collect_env_overrides();
        // Query results are disposable. Do not create a second persistent
        // database outside the .rdb and its WAL for the cache.
        let cache_l1_share = memory_shares.blob_cache_l1_bytes();
        let cache_l1_default = u64::try_from(cache_l1_share).unwrap_or(u64::MAX);
        let configured_l1 = usize::try_from(boot_cache_u64(
            db.store().as_ref(),
            &env_config_overrides,
            "cache.blob.l1_bytes_max",
            cache_l1_default,
        ))
        .map_err(|_| RedDBError::InvalidConfig("cache.blob.l1_bytes_max is too large".into()))?;
        let configured_l2 = boot_cache_u64(
            db.store().as_ref(),
            &env_config_overrides,
            "cache.blob.l2_bytes_max",
            crate::storage::cache::DEFAULT_BLOB_L2_BYTES_MAX,
        );
        let configured_namespaces = usize::try_from(boot_cache_u64(
            db.store().as_ref(),
            &env_config_overrides,
            "cache.blob.max_namespaces",
            u64::try_from(crate::storage::cache::DEFAULT_BLOB_MAX_NAMESPACES).unwrap_or(u64::MAX),
        ))
        .map_err(|_| RedDBError::InvalidConfig("cache.blob.max_namespaces is too large".into()))?;
        if configured_namespaces == 0 {
            return Err(RedDBError::InvalidConfig(
                "cache.blob.max_namespaces must be greater than zero".into(),
            ));
        }
        let configured_namespace_bytes = usize::try_from(boot_cache_u64(
            db.store().as_ref(),
            &env_config_overrides,
            "cache.blob.namespace_bytes_max",
            u64::try_from(configured_l1).unwrap_or(u64::MAX),
        ))
        .map_err(|_| {
            RedDBError::InvalidConfig("cache.blob.namespace_bytes_max is too large".into())
        })?;
        if configured_namespace_bytes == 0 {
            return Err(RedDBError::InvalidConfig(
                "cache.blob.namespace_bytes_max must be greater than zero".into(),
            ));
        }
        let result_blob_cache_config = crate::storage::cache::BlobCacheConfig::default()
            // The cache-specific setting may reserve less memory, but never
            // escapes the process-wide memory budget.
            .with_l1_bytes_max(configured_l1.min(cache_l1_share))
            .with_namespace_bytes_max(
                configured_namespace_bytes
                    .min(configured_l1)
                    .min(cache_l1_share),
            )
            // Zero is the explicit off switch. Read-only runtimes cannot
            // maintain expiry/invalidation state in the internal collection.
            .with_l2_bytes_max(if options.read_only { 0 } else { configured_l2 })
            .with_max_namespaces(configured_namespaces);
        let result_blob_cache = crate::storage::cache::BlobCache::open_with_internal_l2(
            result_blob_cache_config,
            db.store(),
        )
        .map_err(|err| {
            RedDBError::Internal(format!(
                "open single-file result Blob Cache failed: {err:?}"
            ))
        })?;
        let storage_ready_ms = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_millis() as u64)
            .unwrap_or(0);

        let no_auth_boot = crate::service_cli::no_auth_active(&options);
        let runtime = Self {
            background_tasks: Some(Arc::new(background_tasks::RuntimeBackgroundTasks::default())),
            inner: Arc::new(RuntimeInner {
                functions: parking_lot::RwLock::new(
                    super::function_catalog::FunctionCatalog::load(&db)?,
                ),
                db: db.clone(),
                layout: PhysicalLayout::from_options(&options),
                embedded_single_file,
                memory_budget,
                memory_accounting: Arc::new(
                    crate::storage::memory_pools::MemoryAccounting::from_shares(
                        memory_budget,
                        memory_shares,
                    ),
                ),
                memory_reservations: parking_lot::Mutex::new(
                    super::memory_admission::MemoryReservations::default(),
                ),
                mvcc_maintenance: parking_lot::Mutex::new(Default::default()),
                indices: IndexCatalog::register_default_vector_graph(
                    options.has_capability(crate::api::Capability::Table),
                    options.has_capability(crate::api::Capability::Graph),
                ),
                pool_config,
                pool: Mutex::new(PoolState::default()),
                execution_admission: parking_lot::RwLock::new(
                    crate::transport::execution_admission::ExecutionAdmission::for_host(),
                ),
                execution_queue_timeout_ms: AtomicU64::new(30_000),
                started_at_unix_ms: SystemTime::now()
                    .duration_since(UNIX_EPOCH)
                    .unwrap_or_default()
                    .as_millis(),
                probabilistic: super::probabilistic_store::ProbabilisticStore::new(),
                index_store: super::index_store::IndexStore::new(),
                cdc: crate::replication::cdc::CdcBuffer::new(100_000),
                checkpoint_projection_stats: super::CheckpointProjectionStats::default(),
                scrub_state: parking_lot::Mutex::new(super::ScrubRuntimeState::default()),
                checkpoint_columnar_emission_budget_chunks: options
                    .checkpoint_columnar_emission_budget_chunks,
                columnar_projection_size_floor_rows: options.columnar_projection_size_floor_rows,
                backup_scheduler: crate::replication::scheduler::BackupScheduler::new(3600),
                query_cache: parking_lot::RwLock::new(
                    crate::storage::query::planner::cache::PlanCache::new(1000),
                ),
                result_blob_cache,
                result_cache_format_lock: parking_lot::Mutex::new(()),
                result_blob_promotion: parking_lot::Mutex::new(()),
                result_blob_entries: parking_lot::RwLock::new((
                    HashMap::new(),
                    std::collections::VecDeque::new(),
                    true,
                    0,
                    HashSet::new(),
                    None,
                    db.store().result_cache_epoch().unwrap_or(0),
                )),
                ask_answer_cache_entries: parking_lot::RwLock::new((
                    HashSet::new(),
                    std::collections::VecDeque::new(),
                )),
                result_cache_hits: std::sync::atomic::AtomicU64::new(0),
                result_cache_misses: std::sync::atomic::AtomicU64::new(0),
                result_cache_evictions: std::sync::atomic::AtomicU64::new(0),
                ask_daily_spend: parking_lot::RwLock::new(HashMap::new()),
                queue_message_locks: parking_lot::RwLock::new(HashMap::new()),
                rmw_locks: RmwLockTable::new(),
                planner_dirty_tables: parking_lot::RwLock::new(HashSet::new()),
                ec_registry: Arc::new(crate::ec::config::EcRegistry::new()),
                config_registry: Arc::new(crate::auth::registry::ConfigRegistry::new()),
                ec_worker: crate::ec::worker::EcWorker::new(),
                auth_store: parking_lot::RwLock::new(None),
                oauth_validator: parking_lot::RwLock::new(None),
                browser_token_authority: parking_lot::RwLock::new(None),
                views: parking_lot::RwLock::new(HashMap::new()),
                materialized_views: parking_lot::RwLock::new(
                    crate::storage::cache::result::MaterializedViewCache::new(),
                ),
                retention_sweeper: parking_lot::RwLock::new(
                    crate::runtime::retention_sweeper::RetentionSweeperState::new(),
                ),
                transaction_state: crate::runtime::transaction_state::TransactionState::new(),
                env_config_overrides,
                lock_manager: Arc::new({
                    // Sourced from the matrix: Tier B key
                    // `concurrency.locking.deadlock_timeout_ms`
                    // (default 5000). Env var wins at boot so
                    // operators can tune without touching red.config.
                    let env = crate::runtime::config_overlay::collect_env_overrides();
                    let timeout_ms = env
                        .get("concurrency.locking.deadlock_timeout_ms")
                        .and_then(|raw| raw.parse::<u64>().ok())
                        .unwrap_or_else(|| {
                            match crate::runtime::config_matrix::default_for(
                                "concurrency.locking.deadlock_timeout_ms",
                            ) {
                                Some(crate::serde_json::Value::Number(n)) => n as u64,
                                _ => 5000,
                            }
                        });
                    let cfg = crate::runtime::lock_manager::LockConfig {
                        default_timeout: std::time::Duration::from_millis(timeout_ms),
                        ..Default::default()
                    };
                    crate::runtime::lock_manager::LockManager::new(cfg)
                }),
                rls_policies: parking_lot::RwLock::new(HashMap::new()),
                rls_enabled_tables: parking_lot::RwLock::new(HashSet::new()),
                foreign_tables: Arc::new(crate::storage::fdw::ForeignTableRegistry::with_builtins()),
                pending_tombstones: parking_lot::RwLock::new(HashMap::new()),
                pending_versioned_updates: parking_lot::RwLock::new(HashMap::new()),
                pending_queue_dedup: parking_lot::RwLock::new(HashMap::new()),
                pending_kv_watch_events: parking_lot::RwLock::new(HashMap::new()),
                pending_vault_writes: parking_lot::RwLock::new(HashMap::new()),
                pending_store_wal_actions: parking_lot::RwLock::new(HashMap::new()),
                pending_logical_records: parking_lot::Mutex::new(HashMap::new()),
                pending_commit_policies: parking_lot::Mutex::new(HashMap::new()),
                logical_publication: parking_lot::ReentrantMutex::new(()),
                logical_allocated_lsn: std::sync::atomic::AtomicU64::new(0),
                pending_claim_locks: parking_lot::RwLock::new(HashMap::new()),
                queue_wait_registry: std::sync::Arc::new(
                    crate::runtime::queue_wait_registry::QueueWaitRegistry::new(),
                ),
                pending_queue_wakes: parking_lot::RwLock::new(HashMap::new()),
                tenant_tables: parking_lot::RwLock::new(HashMap::new()),
                ddl_epoch: std::sync::atomic::AtomicU64::new(0),
                write_gate: Arc::new(crate::runtime::write_gate::WriteGate::from_options(
                    &options,
                )),
                lifecycle: crate::runtime::lifecycle::Lifecycle::new(),
                resource_limits,
                query_budget_slots: AtomicU64::new(0),
                audit_log: {
                    // Default audit-log path for the in-memory case
                    // sits in the system temp dir; persistent runs
                    // place it next to the resolved data file.
                    //
                    // gh-471 iter 2: route through the resolved
                    // `LogDestination`. Performance/Max tiers emit a
                    // file-backed log destination under the file-owned
                    // support-directory logs tier;
                    // lower tiers / ephemeral runs report `Stderr`
                    // and we keep the legacy file-next-to-data sink.
                    // #1375 — single-file embedded mode keeps the data
                    // directory to exactly the `.rdb` artifact, so the audit
                    // log must NOT land as a sibling. Route it to a
                    // process-unique temp location even when a data path is
                    // set; only the non-embedded case uses the data dir.
                    let data_path = if embedded_single_file || options.read_only {
                        std::env::temp_dir()
                            .join("reddb-embedded-runtime")
                            .join(format!("audit-{}", std::process::id()))
                    } else {
                        options
                            .data_path
                            .clone()
                            .unwrap_or_else(|| std::env::temp_dir().join("reddb"))
                    };
                    let (audit_dest, _) = crate::api::tier_wiring::current_log_destinations();
                    let audit_dest = if options.read_only {
                        crate::storage::layout::LogDestination::Stderr
                    } else {
                        audit_dest
                    };
                    if !matches!(audit_dest, crate::storage::layout::LogDestination::File(_))
                        && (embedded_single_file
                            || options.read_only
                            || options
                                .metadata
                                .contains_key(crate::api::EPHEMERAL_RUNTIME_METADATA_KEY))
                    {
                        // The Stderr/Syslog lower-tier sink resolves to a
                        // `for_data_path` sibling that collides across concurrent
                        // temp-dir runtimes — nextest's process-per-test model
                        // truncates one shared file, flaking audit assertions.
                        // Pin a unique sibling for these short-lived ephemeral /
                        // single-file embedded runtimes. The file-owned support-
                        // dir tier (`File`) is already per-data unique, so leave
                        // it to `for_destination` (#1375: the embedded audit then
                        // still never lands a sibling next to the `.rdb`).
                        let audit_path = reddb_file::layout::sibling_path(
                            &data_path,
                            &reddb_file::layout::sidecar_file_name(&data_path, "audit.log"),
                        );
                        Arc::new(crate::runtime::audit_log::AuditLogger::with_path(
                            audit_path,
                        ))
                    } else {
                        Arc::new(crate::runtime::audit_log::AuditLogger::for_destination(
                            &audit_dest,
                            &data_path,
                        ))
                    }
                },
                control_event_ledger: parking_lot::RwLock::new(Arc::new(
                    crate::runtime::control_events::RuntimeLedger::new(db.store()),
                )),
                control_event_config: options.control_events,
                query_audit: Arc::new(crate::runtime::query_audit::QueryAuditStream::new(
                    db.store(),
                    options.query_audit.clone(),
                )),
                lease_lifecycle: std::sync::OnceLock::new(),
                routing_primary_endpoints: parking_lot::RwLock::new(Default::default()),
                replica_apply_metrics: std::sync::Arc::new(
                    crate::replication::logical::ReplicaApplyMetrics::default(),
                ),
                replica_link_metrics: std::sync::Arc::new(
                    crate::replication::reconnect::ReplicaLinkMetrics::default(),
                ),
                quota_bucket: crate::runtime::quota_bucket::QuotaBucket::from_env(),
                schema_vocabulary: parking_lot::RwLock::new(
                    crate::runtime::schema_vocabulary::SchemaVocabulary::new(),
                ),
                description_enrichment: parking_lot::Mutex::new(Default::default()),
                slow_query_logger: {
                    // Issue #205 — slow-query sink lives in the same
                    // directory the audit log uses, so backup/restore
                    // ships them together. Threshold + sample-pct
                    // default conservatively (1 s, 100% sampling) so
                    // emitted lines are rare and complete. Operators
                    // tune via env / config matrix in a follow-up.
                    //
                    // gh-471 iter 2: same routing as the audit log —
                    // `LogDestination::File(...)` for Performance/Max
                    // lands under the file-owned support-directory logs tier;
                    // lower tiers fall back to `red-slow.log` in the
                    // data directory.
                    // #1375 — see the audit-log note above: single-file mode
                    // never writes the slow-query log as a sibling of the
                    // `.rdb`. Route to a process-unique temp dir when embedded,
                    // regardless of the data path.
                    let fallback_dir = if embedded_single_file || options.read_only {
                        std::env::temp_dir()
                            .join("reddb-embedded-runtime")
                            .join(format!("slow-{}", std::process::id()))
                    } else {
                        options
                            .data_path
                            .as_ref()
                            .and_then(|p| p.parent().map(std::path::PathBuf::from))
                            .unwrap_or_else(|| std::env::temp_dir().join("reddb"))
                    };
                    let threshold_ms = std::env::var("RED_SLOW_QUERY_THRESHOLD_MS")
                        .ok()
                        .and_then(|s| s.parse::<u64>().ok())
                        .unwrap_or(1000);
                    let sample_pct = std::env::var("RED_SLOW_QUERY_SAMPLE_PCT")
                        .ok()
                        .and_then(|s| s.parse::<u8>().ok())
                        .unwrap_or(100);
                    let (_, slow_dest) = crate::api::tier_wiring::current_log_destinations();
                    let slow_dest = if options.read_only {
                        crate::storage::layout::LogDestination::Stderr
                    } else {
                        slow_dest
                    };
                    crate::telemetry::slow_query_logger::SlowQueryLogger::for_destination(
                        &slow_dest,
                        &fallback_dir,
                        threshold_ms,
                        sample_pct,
                    )
                },
                slow_query_store: crate::telemetry::slow_query_store::SlowQueryStore::new(
                    crate::telemetry::slow_query_store::DEFAULT_CAP,
                ),
                kv_stats: crate::runtime::KvStatsCounters::default(),
                metrics_ingest_stats: crate::runtime::MetricsIngestCounters::default(),
                metrics_tenant_activity_stats:
                    crate::runtime::MetricsTenantActivityCounters::default(),
                claim_telemetry: Arc::new(
                    crate::runtime::claim_telemetry::ClaimTelemetryCounters::default(),
                ),
                queue_telemetry: Arc::new(
                    crate::runtime::queue_telemetry::QueueTelemetryCounters::default(),
                ),
                query_latency_telemetry: Arc::new(
                    crate::runtime::query_latency_telemetry::QueryLatencyTelemetry::default(),
                ),
                occupancy_sampler: Arc::new(
                    crate::runtime::occupancy_sampler::OccupancySampler::new(),
                ),
                node_load_telemetry: Arc::new(
                    crate::runtime::node_load_telemetry::NodeLoadTelemetry::default(),
                ),
                queue_presence: Arc::new(
                    crate::storage::queue::presence::ConsumerPresenceRegistry::new(),
                ),
                vector_introspection: Arc::new(
                    crate::storage::vector::introspection::VectorIntrospectionRegistry::new(),
                ),
                kv_tag_index: crate::runtime::KvTagIndex::default(),
                chain_tip_cache: parking_lot::Mutex::new(HashMap::new()),
                chain_integrity_broken: parking_lot::Mutex::new(HashMap::new()),
                integrity_tombstones: parking_lot::Mutex::new(Vec::new()),
                integrity_tombstones_state: std::sync::atomic::AtomicU8::new(0),
            }),
        };

        runtime.install_hash_candidate_admission();

        // Issue #205 — install the process-wide OperatorEvent sink so
        // emit sites buried in storage / replication / signal handlers
        // can record without threading an `&AuditLogger` through every
        // call stack. First registration wins; subsequent in-memory
        // runtimes (test harnesses) fall through to tracing+eprintln.
        crate::telemetry::operator_event::install_global_audit_sink(Arc::clone(
            &runtime.inner.audit_log,
        ));

        // Issue #1238 — wire the slow-query telemetry substrate (ADR 0060).
        // The logger dual-writes: file sink (existing) + ring store (new).
        runtime
            .inner
            .slow_query_logger
            .attach_store(Arc::clone(&runtime.inner.slow_query_store));

        // PLAN.md Phase 9.1 — backfill cold-start phase markers
        // from the wall-clock captured before storage open. The
        // entire `RedDB::open_with_options` call covers both
        // auto-restore (when configured) and WAL replay. We
        // record both phases against the same boundary today;
        // a follow-up will split them once the storage layer
        // surfaces a finer-grained event.
        runtime
            .inner
            .lifecycle
            .set_restore_started_at_ms(boot_open_start_ms);
        runtime
            .inner
            .lifecycle
            .set_restore_ready_at_ms(storage_ready_ms);
        runtime
            .inner
            .lifecycle
            .set_wal_replay_started_at_ms(boot_open_start_ms);
        runtime
            .inner
            .lifecycle
            .set_wal_replay_ready_at_ms(storage_ready_ms);

        let restored_cdc_lsn = runtime
            .inner
            .db
            .replication
            .as_ref()
            .map(|repl| {
                repl.logical_wal_spool
                    .as_ref()
                    .map(|spool| spool.current_lsn())
                    .unwrap_or(0)
            })
            .unwrap_or(0)
            .max(runtime.config_u64("timeline.last_archived_lsn", 0));
        runtime.inner.cdc.set_current_lsn(restored_cdc_lsn);
        runtime
            .inner
            .logical_allocated_lsn
            .store(restored_cdc_lsn, std::sync::atomic::Ordering::Release);
        runtime.rehydrate_snapshot_xid_floor()?;
        assert!(runtime
            .inner
            .db
            .runtime
            .set(super::WeakRuntime(Arc::downgrade(&runtime.inner)))
            .is_ok());
        assert!(
            runtime
                .inner
                .db
                .store()
                .snapshot_manager
                .set(runtime.snapshot_manager())
                .is_ok(),
            "a new runtime owns the store transaction outcomes"
        );
        runtime
            .bootstrap_system_keyed_collections()
            .map_err(|err| RedDBError::Internal(format!("bootstrap system collections: {err}")))?;
        runtime.rehydrate_declared_column_schemas();
        // Registry restoration can checkpoint missing required projections.
        // Register their projectors before that epoch.
        super::control_event_index::prepare(&runtime)?;
        super::queue_storage_index::prepare(&runtime)?;
        runtime.rehydrate_runtime_index_registry()?;
        if runtime
            .db()
            .store()
            .config()
            .resident_memory_bytes_max
            .is_some()
        {
            runtime
                .db()
                .store()
                .checkpoint_missing_secondary_indices()?;
        }
        runtime.rehydrate_kv_tags()?;
        runtime
            .load_probabilistic_state()
            .map_err(|err| RedDBError::Internal(format!("load probabilistic state: {err}")))?;

        // Phase 2.5.4: replay `tenant_tables.{table}.column` markers so
        // tables declared via `TENANT BY (col)` survive restart. Each
        // entry re-registers the auto-policy and flips RLS on again.
        runtime.rehydrate_tenant_tables();
        // Issue #593 slice 9a — replay persisted materialized-view
        // descriptors so `CREATE MATERIALIZED VIEW v AS …` survives a
        // restart. Runs after the system-keyed collections bootstrap
        // and before the API opens.
        runtime.rehydrate_materialized_view_descriptors()?;
        runtime.recover_store_forks()?;
        if let Some(repl) = &runtime.inner.db.replication {
            repl.wal_buffer.set_current_lsn(restored_cdc_lsn);
        }
        runtime.recover_transactional_replication()?;

        // Save system info to red.config on boot
        {
            let sys = SystemInfo::collect();
            let store = runtime.inner.db.store();
            store.with_boot_system_info_update(|| {
                store.set_config_tree(
                    "system",
                    &crate::serde_json::json!({
                        "pid": sys.pid,
                        "cpu_cores": sys.cpu_cores,
                        "total_memory_bytes": sys.total_memory_bytes,
                        "available_memory_bytes": sys.available_memory_bytes,
                        "os": sys.os,
                        "arch": sys.arch,
                        "hostname": sys.hostname,
                        "started_at": SystemTime::now()
                            .duration_since(UNIX_EPOCH)
                            .unwrap_or_default()
                            .as_millis() as u64
                    }),
                )
            });

            // Seed defaults on first boot (only if red.config is empty or missing defaults)
            let store = runtime.inner.db.store();
            if store
                .get_collection("red.config")
                .map(|m| m.query_all(|_| true).len())
                .unwrap_or(0)
                <= 10
            {
                store.set_config_tree("ai", &crate::json!({
                    "default": crate::json!({
                        "provider": "openai",
                        "model": crate::ai::DEFAULT_OPENAI_PROMPT_MODEL
                    }),
                    "max_embedding_inputs": 256,
                    "max_prompt_batch": 256,
                    "timeout": crate::json!({ "connect_secs": 10, "read_secs": 90, "write_secs": 30 })
                }));
                store.set_config_tree(
                    "server",
                    &crate::json!({
                        "max_scan_limit": 1000,
                        "max_body_size": 1048576,
                        "read_timeout_ms": 5000,
                        "write_timeout_ms": 5000
                    }),
                );
                store.set_config_tree(
                    "storage",
                    &crate::json!({
                        "page_size": 4096,
                        "page_cache_capacity": 100000,
                        "auto_checkpoint_pages": 1000,
                        "snapshot_retention": 16,
                        "verify_checksums": true,
                        "segment": crate::json!({
                            "max_entities": 100000,
                            "max_bytes": 268435456_u64,
                            "compression_level": 6
                        }),
                        "hnsw": crate::json!({ "m": 16, "ef_construction": 100, "ef_search": 50 }),
                        "ivf": crate::json!({ "n_lists": 100, "n_probes": 10 }),
                        "bm25": crate::json!({ "k1": 1.2, "b": 0.75 })
                    }),
                );
                store.set_config_tree(
                    "search",
                    &crate::json!({
                        "rag": crate::json!({
                            "max_chunks_per_source": 10,
                            "max_total_chunks": 25,
                            "similarity_threshold": 0.8,
                            "graph_depth": 2,
                            "min_relevance": 0.3
                        }),
                        "fusion": crate::json!({
                            "vector_weight": 0.5,
                            "graph_weight": 0.3,
                            "table_weight": 0.2,
                            "dedup_threshold": 0.85
                        })
                    }),
                );
                store.set_config_tree(
                    "auth",
                    &crate::json!({
                        "enabled": false,
                        "session_ttl_secs": 3600,
                        "require_auth": false
                    }),
                );
                store.set_config_tree(
                    "query",
                    &crate::json!({
                        "connection_pool": crate::json!({ "max_connections": 64, "max_idle": 16 }),
                        "max_recursion_depth": 1000
                    }),
                );
                store.set_config_tree(
                    "indexes",
                    &crate::json!({
                        "auto_select": true,
                        "bloom_filter": crate::json!({
                            "enabled": true,
                            "false_positive_rate": 0.01,
                            "prune_on_scan": true
                        }),
                        "hash": crate::json!({ "enabled": true }),
                        "bitmap": crate::json!({ "enabled": true, "max_cardinality": 1000 }),
                        "spatial": crate::json!({ "enabled": true })
                    }),
                );
                store.set_config_tree(
                    "probabilistic",
                    &crate::json!({
                        "hll_registers": 16384,
                        "sketch_default_width": 1000,
                        "sketch_default_depth": 5,
                        "filter_default_capacity": 100000
                    }),
                );
                store.set_config_tree(
                    "timeseries",
                    &crate::json!({
                        "default_chunk_size": 1024,
                        "compression": crate::json!({
                            "timestamps": "delta_of_delta",
                            "values": "gorilla_xor"
                        }),
                        "default_retention_days": 0
                    }),
                );
                store.set_config_tree(
                    "queue",
                    &crate::json!({
                        "default_max_size": 0,
                        "default_max_attempts": 3,
                        "visibility_timeout_ms": 30000,
                        "consumer_idle_timeout_ms": 60000
                    }),
                );
                store.set_config_tree(
                    "backup",
                    &crate::json!({
                        "enabled": false,
                        "interval_secs": 3600,
                        "retention_count": 24,
                        "upload": false,
                        "backend": "local"
                    }),
                );
                store.set_config_tree(
                    "wal",
                    &crate::json!({
                        "archive": crate::json!({
                            "enabled": false,
                            "retention_hours": 168,
                            "prefix": reddb_file::backup_wal_prefix("")
                        })
                    }),
                );
                store.set_config_tree(
                    "cdc",
                    &crate::json!({
                        "enabled": true,
                        "buffer_size": 100000
                    }),
                );
                store.set_config_tree(
                    "secret",
                    &crate::json!({
                        "auto_encrypt": true,
                        "auto_decrypt": true
                    }),
                );
            }

            // Perf-parity config matrix: heal the Tier A (critical)
            // keys unconditionally on every boot. Idempotent — only
            // writes the default when the key is missing. Keeps
            // `SHOW CONFIG` showing every guarantee the operator has
            // (durability.mode, concurrency.locking.enabled, …) even
            // on long-running datadirs that predate the matrix.
            crate::runtime::config_matrix::heal_critical_keys(store.as_ref());
            seed_storage_deploy_config(store.as_ref(), options.storage_profile);

            // Phase 5 — Lehman-Yao runtime flag. Read the Tier A
            // `storage.btree.lehman_yao` value from the matrix (env
            // > file > red.config > default) and publish it to the
            // storage layer's atomic so the B-tree read / split
            // paths can branch without re-reading the config on
            // every hot-path call.
            let lehman_yao = runtime.config_bool("storage.btree.lehman_yao", true);
            crate::storage::engine::btree::lehman_yao::set_enabled(lehman_yao);
            if lehman_yao {
                tracing::info!(
                    "storage.btree.lehman_yao=true — lock-free concurrent descent enabled"
                );
            }

            // Config file overlay — mounted `/etc/reddb/config.json`
            // (override path via REDDB_CONFIG_FILE). Writes keys with
            // write-if-absent semantics so a later user `SET CONFIG`
            // always wins. Missing file = silent no-op.
            let overlay_path = crate::runtime::config_overlay::config_file_path();
            let _ =
                crate::runtime::config_overlay::apply_config_file(store.as_ref(), &overlay_path);
        }

        // VCS ("Git for Data") — create the `red_*` metadata
        // collections on first boot. Idempotent: `get_or_create_collection`
        // is a no-op if the collection already exists.
        {
            let store = runtime.inner.db.store();
            for name in crate::application::vcs_collections::ALL {
                let _ = store.get_or_create_collection(*name);
            }
            // Seed VCS config namespace with sensible defaults on first
            // boot, matching the pattern used by ai / storage.
            store.set_config_tree(
                crate::application::vcs_collections::CONFIG_NAMESPACE,
                &crate::json!({
                    "default_branch": "main",
                    "author": crate::json!({
                        "name": "reddb",
                        "email": "reddb@localhost"
                    }),
                    "protected_branches": crate::json!(["main"]),
                    "closure": crate::json!({
                        "enabled": true,
                        "lazy": true
                    }),
                    "merge": crate::json!({
                        "default_strategy": "auto",
                        "fast_forward": true
                    })
                }),
            );
        }

        // Migrations — create the `red.migration.definitions` / `red.migration.dependencies`
        // system collections on first boot. Idempotent.
        {
            let store = runtime.inner.db.store();
            for name in crate::application::migration_collections::ALL {
                let _ = store.get_or_create_collection(*name);
            }
        }

        // Topology graph (#803) — ensure the built-in `red.topology.cluster`
        // graph collection (declared WITH ANALYTICS) and its metadata sidecar
        // exist. Idempotent and survives restarts via the WAL-backed contract.
        let _ = crate::application::topology_collections::ensure(&runtime);

        // Bootstrapping topology can publish a metadata checkpoint. Register
        // the optional COUNT projection only after that publication, so old
        // data is not backfilled before readiness. Queries scan until the next
        // checkpoint publishes the projection.
        runtime.prepare_paged_counts()?;

        // Anonymous access is the most consequential posture an operator can
        // choose. Record it before reserving the user-ID floor so the boot-time
        // audit entity remains in the internal range.
        if no_auth_boot {
            use crate::runtime::control_events::{
                ActorRef, ControlEvent, ControlEventCtx, EventKind, Outcome,
            };
            let ledger = std::sync::Arc::clone(&runtime.inner.control_event_ledger.read());
            let ctx = ControlEventCtx {
                actor: ActorRef::System("boot"),
                scope: None,
                request_id: None,
                trace_id: None,
            };
            let event = ControlEvent {
                kind: EventKind::AuthDisabled,
                outcome: Outcome::Allowed,
                action: std::borrow::Cow::Borrowed("auth.disabled"),
                resource: Some("server".to_string()),
                reason: Some("--no-auth / --dev".to_string()),
                matched_policy_id: None,
                fields: std::collections::HashMap::new(),
            };
            if let Err(err) = ledger.emit(&ctx, event) {
                tracing::warn!(
                    target: "reddb::security",
                    error = %err,
                    "could not record the auth-disabled boot in the control-event ledger"
                );
            }
        }

        // Start background maintenance thread (context index refresh +
        // session purge). Held by a WEAK reference to `RuntimeInner`
        // to avoid an ownership cycle. The last foreground owner unparks
        // and joins the worker before releasing its inner reference, so
        // an active weak upgrade cannot retain the pager lock after close.
        // The 60-second work cadence is tracked via `last_work`.
        //
        // The previous version captured `rt = runtime.clone()` by
        // strong reference and ran an unterminated `loop`, which held
        // Arc<RuntimeInner> forever — reopening a persistent database
        // in the same process failed with "Database is locked" because
        // the pager could never drop. See the regression test
        // `finding_1_select_after_bulk_insert_persistent_reopen`.
        {
            let weak = Arc::downgrade(&runtime.inner);
            runtime
                .background_tasks
                .as_ref()
                .expect("foreground runtime")
                .spawn(
                    std::thread::Builder::new().name("reddb-maintenance".into()),
                    move |stopped| {
                        let tick = std::time::Duration::from_millis(200);
                        let work_interval = std::time::Duration::from_secs(60);
                        let mut last_work = std::time::Instant::now();
                        let mut allocator_pressure =
                            super::allocator_pressure::AllocatorPressure::default();
                        loop {
                            std::thread::park_timeout(tick);
                            if stopped.load(AtomicOrdering::Acquire) {
                                break;
                            }
                            let Some(inner) = weak.upgrade() else {
                                // All strong references dropped — the
                                // runtime is gone, exit cleanly.
                                break;
                            };
                            if last_work.elapsed() >= work_interval {
                                let _stats = inner.db.store().context_index().stats();
                                last_work = std::time::Instant::now();
                            }
                            let rt = RedDBRuntime {
                                background_tasks: None,
                                inner,
                            };
                            rt.try_reclaim_history_tick();
                            allocator_pressure.tick();
                        }
                    },
                );
        }

        // Blob Cache expiration is active maintenance, not a read-path side
        // effect. Each pulse scans a rotating bounded slice so expired keys
        // release their L1 budget even when they are never accessed again.
        // A dedicated low-priority worker keeps this work isolated from query
        // execution workers.
        {
            let weak = Arc::downgrade(&runtime.inner);
            runtime
                .background_tasks
                .as_ref()
                .expect("foreground runtime")
                .spawn(
                    std::thread::Builder::new().name("reddb-cache-sweeper".into()),
                    move |stopped| loop {
                        std::thread::park_timeout(std::time::Duration::from_millis(250));
                        if stopped.load(AtomicOrdering::Acquire) {
                            break;
                        }
                        let Some(inner) = weak.upgrade() else {
                            break;
                        };
                        let _ = crate::storage::cache::sweeper::BlobCacheSweeper::sweep_expired(
                            &inner.result_blob_cache,
                            crate::storage::cache::sweeper::SweepLimit::Either {
                                entries: 512,
                                millis: 5,
                            },
                        );
                        let rt = RedDBRuntime {
                            background_tasks: None,
                            inner,
                        };
                        rt.promote_volatile_result_cache_entry();
                    },
                );
        }

        // Start backup scheduler if enabled via red.config
        {
            let store = runtime.inner.db.store();
            let mut backup_enabled = false;
            let mut backup_interval = 3600u64;

            if let Some(manager) = store.get_collection("red.config") {
                manager.for_each_entity(|entity| {
                    if let Some(row) = entity.data.as_row() {
                        let key = row.get_field("key").and_then(|v| match v {
                            reddb_types::Value::Text(s) => Some(s.as_ref()),
                            _ => None,
                        });
                        let val = row.get_field("value");
                        if key == Some("backup.enabled") {
                            backup_enabled = match val {
                                Some(reddb_types::Value::Boolean(true)) => true,
                                Some(reddb_types::Value::Text(s)) => &**s == "true",
                                _ => false,
                            };
                        } else if key == Some("backup.interval_secs") {
                            if let Some(reddb_types::Value::Integer(n)) = val {
                                backup_interval = *n as u64;
                            }
                        }
                    }
                    true
                });
            }

            if backup_enabled {
                runtime.inner.backup_scheduler.set_interval(backup_interval);
                let rt = runtime.clone();
                runtime
                    .inner
                    .backup_scheduler
                    .start(move || rt.trigger_backup().map_err(|e| format!("{}", e)));
            }
        }

        // Load EC registry from red.config and start worker
        {
            runtime
                .inner
                .ec_registry
                .load_from_config_store(runtime.inner.db.store().as_ref());
            if !runtime.inner.db.options().read_only
                && !runtime.inner.ec_registry.async_configs().is_empty()
            {
                runtime.inner.ec_worker.start(
                    Arc::clone(&runtime.inner.ec_registry),
                    Arc::clone(&runtime.inner.db.store()),
                );
            }
        }

        if let (true, crate::replication::ReplicationRole::Replica { primary_addr }) = (
            runtime.inner.db.options().replica_loop_enabled
                && !runtime.inner.db.options().read_only,
            runtime.inner.db.options().replication.role.clone(),
        ) {
            let rt = runtime.clone();
            std::thread::Builder::new()
                .name("reddb-replica".into())
                .spawn(move || rt.run_replica_loop(primary_addr))
                .ok();
        }

        // PLAN.md Phase 1 — Lifecycle Contract. Mark Ready once every
        // boot stage above has completed (WAL replay, restore-from-
        // remote, replica-loop spawn). Health probes flip from 503 to
        // 200 here; shutdown begins from this state.
        runtime.inner.lifecycle.mark_ready();

        #[cfg(not(test))]
        if runtime
            .db()
            .store()
            .config()
            .resident_memory_bytes_max
            .is_some()
            && !runtime.db().options().read_only
        {
            runtime.start_count_projection_worker();
        }

        // Issue #583 slice 10 — ContinuousMaterializedView scheduler.
        // Low-priority background ticker that drains the cache's
        // `claim_due_at` set every ~50ms. Holds only a Weak<RuntimeInner>
        // to avoid an ownership cycle; foreground close unparks and drains
        // an active refresh before releasing storage. Materialized views without
        // a `REFRESH EVERY` clause stay on the manual-refresh path
        // and are skipped by `claim_due_at`, so the loop is a no-op
        // when no scheduled views exist.
        {
            let weak_inner = Arc::downgrade(&runtime.inner);
            runtime
                .background_tasks
                .as_ref()
                .expect("foreground runtime")
                .spawn(
                    std::thread::Builder::new()
                        .name("reddb-mv-scheduler".into())
                        // Rust's default for spawned threads is 2 MiB, which is too
                        // small for the query-execution path that refresh_due_materialized_views
                        // runs (StatementExecutionFrame + guards per view). Match the
                        // 8 MiB that the OS gives the main thread.
                        .stack_size(8 * 1024 * 1024),
                    move |stopped| loop {
                        std::thread::park_timeout(std::time::Duration::from_millis(50));
                        if stopped.load(AtomicOrdering::Acquire) {
                            break;
                        }
                        let Some(inner) = weak_inner.upgrade() else {
                            break;
                        };
                        let rt = RedDBRuntime {
                            background_tasks: None,
                            inner,
                        };
                        rt.refresh_due_materialized_views();
                    },
                );
        }

        // Issue #584 slice 12 — DeclarativeRetention background sweeper.
        // Low-priority ticker that physically reclaims rows whose
        // timestamp has fallen beyond the retention window. Holds a
        // `Weak<RuntimeInner>`; foreground close drains an active tick
        // before releasing storage (shutdown leaves storage consistent
        // because each tick goes through the standard DELETE path —
        // there is no half-finished mutation state to clean up). The
        // tick interval is intentionally longer than the MV scheduler
        // (500ms) because retention is order-of-seconds at minimum.
        if !runtime.write_gate().is_read_only() {
            let weak_inner = Arc::downgrade(&runtime.inner);
            runtime
                .background_tasks
                .as_ref()
                .expect("foreground runtime")
                .spawn(
                    std::thread::Builder::new().name("reddb-retention-sweeper".into()),
                    move |stopped| loop {
                        std::thread::park_timeout(std::time::Duration::from_millis(500));
                        if stopped.load(AtomicOrdering::Acquire) {
                            break;
                        }
                        let Some(inner) = weak_inner.upgrade() else {
                            break;
                        };
                        let rt = RedDBRuntime {
                            background_tasks: None,
                            inner,
                        };
                        rt.sweep_retention_tick(
                            crate::runtime::retention_sweeper::DEFAULT_SWEEPER_BATCH,
                        );
                        rt.sweep_individual_ttl_tick(
                            crate::runtime::retention_sweeper::DEFAULT_SWEEPER_BATCH,
                        );
                    },
                );
        }

        // #1369 — reserve the fixed internal-id floor only after every boot
        // stage has finished. Some persistent-only startup paths publish
        // internal entities, so reserving it earlier lets those paths consume
        // the first documented user `rid`. `register_entity_id` only raises
        // the allocator, leaving databases already past the floor untouched.
        runtime
            .inner
            .db
            .store()
            .register_entity_id(crate::storage::EntityId::new(
                crate::storage::FIRST_USER_ENTITY_ID - 1,
            ));

        Ok(runtime)
    }

    fn rehydrate_snapshot_xid_floor(&self) -> RedDBResult<()> {
        let store = self.inner.db.store();
        let snapshot_manager = self.inner.transaction_state.snapshot_manager();
        let base_high_water_mark = store.startup_xid_high_water_mark();
        if let Some(high_water_mark) = base_high_water_mark {
            snapshot_manager.observe_committed_xid(high_water_mark);
        }
        for collection in store.list_collections() {
            let Some(manager) = store.get_collection(&collection) else {
                continue;
            };
            let observe = |entity: &crate::storage::UnifiedEntity| {
                snapshot_manager.observe_committed_xid(entity.xmin);
                snapshot_manager.observe_committed_xid(entity.xmax);
                true
            };
            if base_high_water_mark.is_some() {
                // The catalog covers the exact immutable roots. Committed WAL
                // replay remains resident and must still advance the floor.
                manager.for_each_entity(observe);
            } else {
                // Older or unproven generations require complete physical
                // validation, one bounded record at a time, before filtering.
                manager.try_for_each_entity(usize::MAX, observe)?;
            }
        }
        if base_high_water_mark.is_none() {
            store.remember_startup_xid_high_water_mark(
                snapshot_manager.peek_next_xid().saturating_sub(1),
            );
        }
        Ok(())
    }

    /// Provision an empty Table-shaped collection that backs a
    /// `CREATE MATERIALIZED VIEW v` (issue #594 slice 9b of #575).
    /// `SELECT FROM v` reads this collection directly; the rewriter is
    /// configured to skip materialized views so the body is no longer
    /// substituted. REFRESH still writes to the cache slot — wiring it
    /// into this backing collection is the job of slice 9c.
    ///
    /// Idempotent: re-running for the same name leaves the existing
    /// collection in place (mirrors `CREATE TABLE IF NOT EXISTS`
    /// semantics). This keeps `CREATE OR REPLACE MATERIALIZED VIEW v`
    /// cheap — the body change does not invalidate already-buffered
    /// rows. Until 9c lands the backing is always empty anyway.
    pub(crate) fn ensure_materialized_view_backing(&self, name: &str) -> RedDBResult<()> {
        let store = self.inner.db.store();
        let mut changed = false;
        if store.get_collection(name).is_none() {
            store.get_or_create_collection(name);
            changed = true;
        }
        if self.inner.db.collection_contract(name).is_none() {
            self.inner
                .db
                .save_collection_contract(system_keyed_collection_contract(
                    name,
                    crate::catalog::CollectionModel::Table,
                ))
                .map_err(|err| RedDBError::Internal(err.to_string()))?;
            changed = true;
        }
        if changed {
            self.inner
                .db
                .persist_metadata()
                .map_err(|err| RedDBError::Internal(err.to_string()))?;
        }
        Ok(())
    }

    /// Inverse of [`ensure_materialized_view_backing`] — drops the
    /// backing collection on `DROP MATERIALIZED VIEW v`. No-op when
    /// the collection was never created (e.g. a `DROP MATERIALIZED
    /// VIEW IF EXISTS v` against an unknown name).
    pub(crate) fn drop_materialized_view_backing(&self, name: &str) -> RedDBResult<()> {
        let store = self.inner.db.store();
        if store.get_collection(name).is_none() {
            return Ok(());
        }
        store
            .drop_collection(name)
            .map_err(|err| RedDBError::Internal(err.to_string()))?;
        // The contract may have been dropped already (DROP TABLE path)
        // — ignore "not found" errors by checking presence first.
        if self.inner.db.collection_contract(name).is_some() {
            self.inner
                .db
                .remove_collection_contract(name)
                .map_err(|err| RedDBError::Internal(err.to_string()))?;
        }
        self.invalidate_result_cache();
        self.inner
            .db
            .persist_metadata()
            .map_err(|err| RedDBError::Internal(err.to_string()))?;
        Ok(())
    }

    fn bootstrap_system_keyed_collections(&self) -> RedDBResult<()> {
        let mut changed = false;
        for (name, model) in [
            ("red.config", crate::catalog::CollectionModel::Config),
            ("red.vault", crate::catalog::CollectionModel::Vault),
            // Issue #593 — materialized-view catalog. One row per
            // `CREATE MATERIALIZED VIEW`; rehydrated at boot before
            // the API opens.
            (
                crate::runtime::continuous_materialized_view::CATALOG_COLLECTION,
                crate::catalog::CollectionModel::Config,
            ),
        ] {
            if self.inner.db.store().get_collection(name).is_none() {
                self.inner.db.store().get_or_create_collection(name);
                changed = true;
            }
            if self.inner.db.collection_contract(name).is_none() {
                let contract = system_keyed_collection_contract(name, model);
                if self.inner.db.options().read_only {
                    self.inner.db.cache_read_only_bootstrap_contract(contract);
                } else {
                    self.inner
                        .db
                        .save_collection_contract(contract)
                        .map_err(|err| RedDBError::Internal(err.to_string()))?;
                }
                changed = true;
            }
        }
        if changed {
            self.inner
                .db
                .persist_metadata()
                .map_err(|err| RedDBError::Internal(err.to_string()))?;
        }
        Ok(())
    }

    pub fn db(&self) -> Arc<RedDB> {
        Arc::clone(&self.inner.db)
    }

    /// Direct access to the runtime's secondary-index store.
    /// Used by bulk-insert entry points (gRPC binary bulk, HTTP bulk,
    /// wire bulk) that need to push new rows through the per-index
    /// maintenance hook after `store.bulk_insert` returns.
    pub fn index_store_ref(&self) -> &super::index_store::IndexStore {
        &self.inner.index_store
    }

    /// Apply a DDL event to the schema-vocabulary reverse index
    /// (issue #120). Called by DDL execution paths after the catalog
    /// mutation has succeeded so the index never holds entries for
    /// half-applied DDL.
    pub(crate) fn schema_vocabulary_apply(
        &self,
        event: crate::runtime::schema_vocabulary::DdlEvent,
    ) {
        self.inner.schema_vocabulary.write().on_ddl(event.clone());
        self.schedule_collection_description_enrichment(&event);
    }

    pub(crate) fn schema_vocabulary_sync_descriptions(&self, collection: &str) {
        let Some(contract) = self.inner.db.collection_contract(collection) else {
            return;
        };
        let columns = contract
            .declared_columns
            .iter()
            .filter_map(|column| {
                column
                    .description
                    .as_ref()
                    .map(|description| (column.name.clone(), description.clone()))
            })
            .collect::<Vec<_>>();
        self.inner.schema_vocabulary.write().update_descriptions(
            collection,
            contract.description.as_deref(),
            &columns,
        );
    }

    /// Lookup `token` in the schema-vocabulary reverse index. Returns
    /// an owned `Vec<VocabHit>` because the underlying read lock
    /// cannot be borrowed across the call boundary; the slice from
    /// `SchemaVocabulary::lookup` is cloned per hit.
    pub fn schema_vocabulary_lookup(
        &self,
        token: &str,
    ) -> Vec<crate::runtime::schema_vocabulary::VocabHit> {
        self.inner.schema_vocabulary.read().lookup(token).to_vec()
    }

    /// Inject an AuthStore into the runtime. Called by server boot
    /// after the vault has been bootstrapped, so that `Value::Secret`
    /// auto-encrypt/decrypt can reach the vault AES key.
    pub fn set_auth_store(&self, store: Arc<crate::auth::store::AuthStore>) {
        *self.inner.auth_store.write() = Some(store);
    }

    /// Snapshot the current AuthStore (if any). Used by the wire listener
    /// to validate bearer tokens issued via HTTP `/auth/login`.
    pub fn auth_store(&self) -> Option<Arc<crate::auth::store::AuthStore>> {
        self.inner.auth_store.read().clone()
    }

    /// Inject an `OAuthValidator` into the runtime. When set, HTTP and
    /// wire transports try OAuth JWT validation before falling back to
    /// the local AuthStore lookup. Pass `None` to disable.
    pub fn set_oauth_validator(&self, validator: Option<Arc<crate::auth::oauth::OAuthValidator>>) {
        *self.inner.oauth_validator.write() = validator;
    }

    /// Returns a clone of the configured `OAuthValidator` Arc, if any.
    /// Hot path: called per HTTP request when an Authorization header
    /// is present, so we hand back a cheap Arc clone.
    pub fn oauth_validator(&self) -> Option<Arc<crate::auth::oauth::OAuthValidator>> {
        self.inner.oauth_validator.read().clone()
    }

    /// Inject the browser-token authority (issue #936). When set, the
    /// RedWire WS handshake accepts the short-lived access JWT it mints
    /// (alongside, and tried before, the federated OAuth validator), and
    /// the `/auth/browser/*` HTTP endpoints can issue/rotate the pair.
    /// `None` leaves the browser credential flow inert.
    pub fn set_browser_token_authority(
        &self,
        authority: Option<Arc<crate::auth::browser_token::BrowserTokenAuthority>>,
    ) {
        *self.inner.browser_token_authority.write() = authority;
    }

    /// Snapshot the browser-token authority, if wired. Read on the WS
    /// handshake path and by the `/auth/browser/*` handlers; a cheap Arc
    /// clone keeps the lock hold short.
    pub fn browser_token_authority(
        &self,
    ) -> Option<Arc<crate::auth::browser_token::BrowserTokenAuthority>> {
        self.inner.browser_token_authority.read().clone()
    }
}

#[cfg(test)]
mod cache_boot_tests {
    use super::*;

    #[test]
    fn persisted_cache_limits_apply_on_next_boot_within_memory_budget() {
        let directory = tempfile::tempdir().expect("cache config fixture");
        let options = RedDBOptions::persistent(directory.path().join("cache-config.rdb"))
            .with_memory_budget(64 * 1024 * 1024);
        let runtime = RedDBRuntime::with_options(options.clone()).expect("initial runtime");
        runtime.db().store().set_config_tree(
            "cache.blob",
            &crate::json!({
                "l1_bytes_max": 1024 * 1024,
                "l2_bytes_max": 2 * 1024 * 1024,
                "namespace_bytes_max": 256 * 1024,
                "max_namespaces": 7
            }),
        );
        runtime.flush().expect("persist cache config");
        drop(runtime);

        let reopened = RedDBRuntime::with_options(options).expect("configured runtime");
        let stats = reopened.result_blob_cache().stats();
        assert_eq!(stats.l1_bytes_max(), 1024 * 1024);
        assert_eq!(stats.l2_bytes_max(), 2 * 1024 * 1024);
        assert_eq!(stats.namespace_bytes_max(), 256 * 1024);
        assert_eq!(stats.max_namespaces(), 7);
    }

    #[test]
    fn single_file_l2_survives_runtime_restart_without_sidecar() {
        let directory = tempfile::tempdir().expect("single-file L2 fixture");
        let path = directory.path().join("cache-l2.rdb");
        let options = RedDBOptions::persistent(&path);
        let runtime = RedDBRuntime::with_options(options.clone()).expect("initial runtime");
        runtime
            .result_blob_cache()
            .put(
                "tenant",
                "key",
                crate::storage::cache::BlobCachePut::new(b"durable".to_vec()).with_policy(
                    crate::storage::cache::BlobCachePolicy::default()
                        .l1_admission(crate::storage::cache::L1Admission::Never),
                ),
            )
            .expect("write internal L2");
        assert!(runtime.result_blob_cache().l2_path().is_none());
        runtime.flush().expect("checkpoint internal L2");
        drop(runtime);

        let reopened = RedDBRuntime::with_options(options).expect("reopen runtime");
        assert_eq!(
            reopened
                .result_blob_cache()
                .get("tenant", "key")
                .expect("L2 hit after restart")
                .bytes()
                .as_ref(),
            b"durable"
        );
        drop(reopened);
        let siblings: Vec<_> = std::fs::read_dir(directory.path())
            .expect("list fixture")
            .filter_map(Result::ok)
            .map(|entry| entry.file_name().to_string_lossy().into_owned())
            .collect();
        assert_eq!(siblings, vec!["cache-l2.rdb"]);
    }

    #[test]
    fn single_file_l2_deadline_survives_restart_and_sweeps_atomically() {
        let directory = tempfile::tempdir().expect("single-file L2 TTL fixture");
        let path = directory.path().join("cache-l2-ttl.rdb");
        let options = RedDBOptions::persistent(&path);
        let mut runtime = RedDBRuntime::with_options(options.clone()).expect("initial runtime");
        drop(runtime.background_tasks.take());
        runtime
            .result_blob_cache()
            .put(
                "tenant",
                "expired",
                crate::storage::cache::BlobCachePut::new(b"expired".to_vec()).with_policy(
                    crate::storage::cache::BlobCachePolicy::default()
                        .expires_at_unix_ms(1)
                        .l1_admission(crate::storage::cache::L1Admission::Never),
                ),
            )
            .expect("write expiring L2 entry");
        runtime.flush().expect("checkpoint L2 deadline");
        drop(runtime);

        let mut reopened = RedDBRuntime::with_options(options).expect("reopen runtime");
        drop(reopened.background_tasks.take());
        let manager = reopened
            .db()
            .store()
            .get_collection(crate::storage::cache::blob::INTERNAL_L2_COLLECTION)
            .expect("L2 collection");
        assert_eq!(manager.scheduled_metadata_expiry_count(), 1);
        let bytes_before = reopened.result_blob_cache().stats().l2_bytes_in_use();
        assert!(bytes_before > 0);

        // Generic row TTL must not bypass the cache's atomic byte-counter
        // update. The dedicated cache sweeper owns this collection.
        assert_eq!(reopened.sweep_individual_ttl_tick_at(64, u64::MAX), 0);
        assert_eq!(
            reopened.result_blob_cache().stats().l2_bytes_in_use(),
            bytes_before
        );
        let report = crate::storage::cache::BlobCacheSweeper::sweep_expired(
            reopened.result_blob_cache(),
            crate::storage::cache::SweepLimit::Entries(1),
        );
        assert_eq!(report.entries_evicted, 1);
        assert_eq!(reopened.result_blob_cache().stats().l2_bytes_in_use(), 0);
        assert_eq!(manager.scheduled_metadata_expiry_count(), 0);
    }

    #[test]
    fn expired_l2_payload_pages_are_reused() {
        let directory = tempfile::tempdir().expect("L2 page reuse fixture");
        let path = directory.path().join("cache-l2-reuse.rdb");
        let options = RedDBOptions::persistent(&path)
            .with_memory_budget(32 * 1024 * 1024)
            .with_bounded_disk_residency(true);
        let mut runtime = RedDBRuntime::with_options(options.clone()).expect("runtime");
        drop(runtime.background_tasks.take());
        let mut state = 0x9e37_79b9_7f4a_7c15u64;
        let payload: Vec<u8> = std::iter::repeat_with(|| {
            state ^= state << 13;
            state ^= state >> 7;
            state ^= state << 17;
            state.to_le_bytes()[0]
        })
        .take(64 * 1024)
        .collect();
        for id in 0..8 {
            runtime
                .result_blob_cache()
                .put(
                    "reuse",
                    format!("expired-{id}"),
                    crate::storage::cache::BlobCachePut::new(payload.clone()).with_policy(
                        crate::storage::cache::BlobCachePolicy::default()
                            .expires_at_unix_ms(1)
                            .l1_admission(crate::storage::cache::L1Admission::Never),
                    ),
                )
                .expect("expired L2 payload");
        }
        runtime.checkpoint().expect("initial L2 checkpoint");
        let initial_pages = runtime
            .db()
            .store()
            .pager()
            .expect("pager")
            .page_count()
            .expect("initial page count");
        drop(runtime);

        let mut runtime = RedDBRuntime::with_options(options).expect("reopened runtime");
        drop(runtime.background_tasks.take());
        let store = runtime.db().store();
        let pager = store.pager().expect("pager");
        let report = crate::storage::cache::BlobCacheSweeper::sweep_expired(
            runtime.result_blob_cache(),
            crate::storage::cache::SweepLimit::Entries(64),
        );
        assert_eq!(report.entries_evicted, 8);
        runtime.checkpoint().expect("expired L2 checkpoint");

        let mut cursor = store
            .mvcc_reclaim_cursor(crate::storage::cache::blob::INTERNAL_L2_COLLECTION.to_string())
            .expect("L2 reclaim cursor");
        for _ in 0..64 {
            store
                .reclaim_mvcc_tick(
                    &mut cursor,
                    &runtime.snapshot_manager(),
                    runtime.mvcc_vacuum_cutoff_xid(),
                    64,
                    8,
                )
                .expect("L2 MVCC reclaim");
            if cursor.finished() {
                break;
            }
        }
        assert!(cursor.finished());
        drop(cursor);
        for _ in 0..3 {
            runtime.checkpoint().expect("publish reusable L2 pages");
        }
        let free_before_reuse = pager.free_page_count().expect("free pages");

        for id in 0..8 {
            runtime
                .result_blob_cache()
                .put(
                    "reuse",
                    format!("replacement-{id}"),
                    crate::storage::cache::BlobCachePut::new(payload.clone()).with_policy(
                        crate::storage::cache::BlobCachePolicy::default()
                            .expires_at_unix_ms(u64::MAX)
                            .l1_admission(crate::storage::cache::L1Admission::Never),
                    ),
                )
                .expect("replacement L2 payload");
        }
        runtime.checkpoint().expect("replacement L2 checkpoint");
        let pages_after_reuse = pager.page_count().expect("page count after reuse");
        assert!(
            pages_after_reuse <= initial_pages.saturating_add(16),
            "expired L2 pages were not reused: initial={initial_pages}, free_before={free_before_reuse}, after={pages_after_reuse}"
        );
    }

    #[test]
    fn zero_cache_namespace_limit_is_rejected_on_boot() {
        let directory = tempfile::tempdir().expect("cache config fixture");
        let options = RedDBOptions::persistent(directory.path().join("cache-config-zero.rdb"));
        let runtime = RedDBRuntime::with_options(options.clone()).expect("initial runtime");
        runtime
            .db()
            .store()
            .set_config_tree("cache.blob.max_namespaces", &crate::json!(0));
        runtime.flush().expect("persist cache config");
        drop(runtime);

        let error = match RedDBRuntime::with_options(options) {
            Ok(_) => panic!("zero limit must fail boot"),
            Err(error) => error,
        };
        assert!(error
            .to_string()
            .contains("cache.blob.max_namespaces must be greater than zero"));
    }

    #[test]
    fn zero_cache_namespace_memory_limit_is_rejected_on_boot() {
        let directory = tempfile::tempdir().expect("cache config fixture");
        let options = RedDBOptions::persistent(directory.path().join("cache-bytes-zero.rdb"));
        let runtime = RedDBRuntime::with_options(options.clone()).expect("initial runtime");
        runtime
            .db()
            .store()
            .set_config_tree("cache.blob.namespace_bytes_max", &crate::json!(0));
        runtime.flush().expect("persist cache config");
        drop(runtime);

        let error = match RedDBRuntime::with_options(options) {
            Ok(_) => panic!("zero namespace memory limit must fail boot"),
            Err(error) => error,
        };
        assert!(error
            .to_string()
            .contains("cache.blob.namespace_bytes_max must be greater than zero"));
    }
}

#[cfg(test)]
mod xid_resume_tests {
    use super::*;
    use reddb_engine::storage::collection_read::{CollectionCursor, CollectionRead, EncodedRecord};

    struct Unreadable;

    fn unavailable() -> crate::storage::StoreError {
        crate::storage::StoreError::Io(std::io::Error::other("XID bootstrap read a base payload"))
    }

    impl CollectionRead for Unreadable {
        fn get_record(
            &self,
            id: crate::storage::EntityId,
            _: usize,
        ) -> Result<Option<EncodedRecord>, crate::storage::StoreError> {
            if id.raw() == 999 {
                Ok(None)
            } else {
                Err(unavailable())
            }
        }
        fn cursor(&self) -> Result<Box<dyn CollectionCursor + '_>, crate::storage::StoreError> {
            Err(unavailable())
        }
        fn owned_cursor(&self) -> Result<Box<dyn CollectionCursor>, crate::storage::StoreError> {
            Err(unavailable())
        }
    }

    #[test]
    fn xid_resume_survives_pending_checkpoint_process_exit() {
        const FIXTURE: &str = "REDDB_XID_RESUME_CRASH_FIXTURE";
        let open = |path: std::path::PathBuf| {
            let options = RedDBOptions::persistent(path)
                .with_memory_budget(64 * 1024 * 1024)
                .with_storage_profile(
                    crate::storage::profile::StorageDeployPreset::PrimaryReplicaDev.selection(),
                )
                .expect("profile");
            crate::storage::RedDB::with_disk_residency_for_qualification(|| {
                RedDBRuntime::with_options(options)
            })
            .expect("crash recovery runtime")
        };
        if let Some(root) = std::env::var_os(FIXTURE) {
            let root = std::path::PathBuf::from(root);
            assert_eq!(
                std::fs::read_to_string(root.join("owned-fixture")).expect("owned fixture"),
                "xid-resume-crash-v1"
            );
            let runtime = open(root.join("crash.rdb"));
            for sql in [
                "CREATE TABLE crash_rows (id INTEGER, payload TEXT)",
                "INSERT INTO crash_rows (id, payload) VALUES (1, 'committed')",
                "BEGIN",
                "UPDATE crash_rows SET payload = 'pending' WHERE id = 1",
                "INSERT INTO crash_rows (id, payload) VALUES (2, 'pending')",
            ] {
                runtime.execute_query(sql).expect("crash fixture statement");
            }
            runtime
                .flush()
                .expect("checkpoint with pending transaction");
            std::fs::write(
                root.join("checkpoint-complete"),
                "pending transaction remains open",
            )
            .expect("acknowledged fixture checkpoint");
            // Deliberately skip all runtime destructors and rollback. The
            // parent must recover the committed preimage from the native file.
            std::process::exit(0);
        }
        let directory = tempfile::tempdir().expect("owned crash fixture");
        std::fs::write(
            directory.path().join("owned-fixture"),
            "xid-resume-crash-v1",
        )
        .expect("ownership marker");
        let child = std::process::Command::new(std::env::current_exe().expect("test executable"))
            .args([
                "--exact",
                "runtime::impl_lifecycle::xid_resume_tests::xid_resume_survives_pending_checkpoint_process_exit",
                "--test-threads=1",
            ])
            .env(FIXTURE, directory.path())
            .output()
            .expect("crashing owned child");
        assert!(
            child.status.success(),
            "{}",
            String::from_utf8_lossy(&child.stderr)
        );
        assert!(directory.path().join("checkpoint-complete").is_file());
        let path = directory.path().join("crash.rdb");
        assert!(path.is_file());
        let runtime = open(path.clone());
        let result = runtime
            .execute_query("SELECT id, payload FROM crash_rows ORDER BY id")
            .expect("committed preimage");
        assert_eq!(
            result.result.records.len(),
            1,
            "pending insert must stay invisible"
        );
        assert_eq!(result.result.records[0].get("id"), Some(&Value::Integer(1)));
        assert_eq!(
            result.result.records[0].get("payload"),
            Some(&Value::text("committed"))
        );
        runtime
            .execute_query("INSERT INTO crash_rows (id, payload) VALUES (3, 'after')")
            .expect("new writer after recovery");
        runtime.flush().expect("recovered checkpoint");
        drop(runtime);
        let reopened = open(path);
        let result = reopened
            .execute_query("SELECT id FROM crash_rows ORDER BY id")
            .expect("second recovery");
        assert_eq!(result.result.records.len(), 2);
        assert_eq!(result.result.records[0].get("id"), Some(&Value::Integer(1)));
        assert_eq!(result.result.records[1].get("id"), Some(&Value::Integer(3)));
    }

    #[test]
    fn xid_resume_skips_known_base_payloads_but_rejects_an_unproven_root() {
        let directory = tempfile::tempdir().expect("resume fixture");
        let options = RedDBOptions::persistent(directory.path().join("resume.rdb"))
            .with_memory_budget(64 * 1024 * 1024)
            .with_storage_profile(
                crate::storage::profile::StorageDeployPreset::PrimaryReplicaDev.selection(),
            )
            .expect("profile");
        let runtime = crate::storage::RedDB::with_disk_residency_for_qualification(|| {
            RedDBRuntime::with_options(options)
        })
        .expect("runtime");
        runtime
            .execute_query("CREATE TABLE resume_rows (id INTEGER)")
            .expect("table");
        runtime
            .execute_query("INSERT INTO resume_rows (id) VALUES (1)")
            .expect("row");
        runtime.flush().expect("publish complete XID summary");
        let store = runtime.db().store();
        assert!(store.startup_xid_high_water_mark().is_some());
        let root = store
            .collection_root_page("resume_rows")
            .expect("published root");
        let manager = store.get_collection("resume_rows").expect("manager");
        for (candidate, proven) in [(root, true), (root + 1, false)] {
            manager.install_backing(
                Arc::new(Unreadable),
                candidate,
                store.format_version(),
                4096,
                1,
            );
            let mut overlay = crate::storage::UnifiedEntity::table_row(
                crate::storage::EntityId::new(999),
                "resume_rows",
                999,
                vec![Value::Integer(2)],
            );
            overlay.xmin = 500_000;
            overlay.xmax = 600_000;
            manager.insert(overlay).expect("resident WAL overlay");
            let result = runtime.rehydrate_snapshot_xid_floor();
            assert_eq!(result.is_ok(), proven, "root={candidate}: {result:?}");
            if proven {
                assert!(runtime.snapshot_manager().peek_next_xid() > 600_000);
            }
        }
    }
}