reddb_server/storage/unified/devx/reddb/

impl_registry.rs

use super::*;

impl RedDB {
    pub(crate) fn write_column_block_page(
        &self,
        bytes: &[u8],
    ) -> Result<crate::storage::engine::PageLocation, Box<dyn std::error::Error>> {
        use crate::storage::engine::PageType;

        let store = self.store();
        let Some(pager) = store.pager() else {
            return Ok(crate::storage::engine::PageLocation::new(
                0,
                0,
                bytes.len() as u32,
            ));
        };
        let content_size = crate::storage::engine::page::CONTENT_SIZE;
        let page_count = bytes.len().max(1).div_ceil(content_size);
        let mut first_page_id = None;
        for page_index in 0..page_count {
            let mut page = pager.allocate_page(PageType::ColumnBlock)?;
            let page_id = page.page_id();
            if let Some(first) = first_page_id {
                let expected = first + page_index as u32;
                if page_id != expected {
                    return Err(format!(
                        "column block page allocation was not contiguous: got {page_id}, expected {expected}"
                    )
                    .into());
                }
            } else {
                first_page_id = Some(page_id);
            }
            let start = page_index * content_size;
            let end = (start + content_size).min(bytes.len());
            if start < end {
                page.content_mut()[..end - start].copy_from_slice(&bytes[start..end]);
            }
            pager.write_page_encrypted(page_id, page)?;
        }
        Ok(crate::storage::engine::PageLocation::new(
            first_page_id.expect("page_count is at least one"),
            0,
            bytes.len() as u32,
        ))
    }

    pub(crate) fn read_column_block_page(
        &self,
        loc: crate::storage::engine::PageLocation,
    ) -> Result<Option<Vec<u8>>, Box<dyn std::error::Error>> {
        let store = self.store();
        let Some(pager) = store.pager() else {
            return Ok(None);
        };
        let content_size = crate::storage::engine::page::CONTENT_SIZE;
        let mut remaining = loc.length as usize;
        let mut page_id = loc.page_id;
        let mut offset = loc.offset as usize;
        let mut out = Vec::with_capacity(remaining);
        while remaining > 0 {
            let page = pager.read_page_decrypted(page_id)?;
            if page.page_type()? != crate::storage::engine::PageType::ColumnBlock {
                return Err(format!("page {page_id} is not a ColumnBlock page").into());
            }
            if offset > content_size {
                return Err(format!(
                    "column block page location offset out of bounds: {offset} > {content_size}"
                )
                .into());
            }
            let available = content_size - offset;
            let take = remaining.min(available);
            out.extend_from_slice(&page.content()[offset..offset + take]);
            remaining -= take;
            page_id = page_id.saturating_add(1);
            offset = 0;
        }
        Ok(Some(out))
    }

    pub fn tree_definitions(&self) -> Vec<crate::physical::PhysicalTreeDefinition> {
        self.physical_metadata()
            .map(|metadata| metadata.tree_definitions)
            .unwrap_or_default()
    }

    pub fn tree_definition(
        &self,
        collection: &str,
        name: &str,
    ) -> Option<crate::physical::PhysicalTreeDefinition> {
        self.tree_definitions()
            .into_iter()
            .find(|definition| definition.collection == collection && definition.name == name)
    }

    pub fn save_tree_definition(
        &self,
        definition: crate::physical::PhysicalTreeDefinition,
    ) -> Result<crate::physical::PhysicalTreeDefinition, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            if let Some(existing) = metadata.tree_definitions.iter_mut().find(|existing| {
                existing.collection == definition.collection && existing.name == definition.name
            }) {
                *existing = definition.clone();
            } else {
                metadata.tree_definitions.push(definition.clone());
            }
            metadata.tree_definitions.sort_by(|left, right| {
                left.collection
                    .cmp(&right.collection)
                    .then_with(|| left.name.cmp(&right.name))
            });
            definition.clone()
        })
    }

    pub fn remove_tree_definition(
        &self,
        collection: &str,
        name: &str,
    ) -> Result<Option<crate::physical::PhysicalTreeDefinition>, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            metadata
                .tree_definitions
                .iter()
                .position(|definition| {
                    definition.collection == collection && definition.name == name
                })
                .map(|index| metadata.tree_definitions.remove(index))
        })
    }

    pub fn collection_default_ttl_ms(&self, collection: &str) -> Option<u64> {
        self.collection_ttl_defaults_ms
            .read()
            .ok()
            .and_then(|defaults| defaults.get(collection).copied())
    }

    pub fn set_collection_default_ttl_ms(&self, collection: impl Into<String>, ttl_ms: u64) {
        if let Ok(mut defaults) = self.collection_ttl_defaults_ms.write() {
            defaults.insert(collection.into(), ttl_ms);
        }
    }

    pub fn clear_collection_default_ttl_ms(&self, collection: &str) {
        if let Ok(mut defaults) = self.collection_ttl_defaults_ms.write() {
            defaults.remove(collection);
        }
    }

    pub fn collection_contracts(&self) -> Vec<crate::physical::CollectionContract> {
        self.contract_cache_map()
            .values()
            .map(|arc| (**arc).clone())
            .collect()
    }

    pub fn collection_contract(
        &self,
        collection: &str,
    ) -> Option<crate::physical::CollectionContract> {
        self.contract_cache_map()
            .get(collection)
            .map(|arc| (**arc).clone())
    }

    /// Arc-bumping variant — callers that only need read access skip
    /// the per-call full `CollectionContract` clone. Deep clones cost
    /// ~200-400 ns each (vec of declared columns + string allocs);
    /// the UPDATE fast path hits this 2-3× per mutation.
    pub fn collection_contract_arc(
        &self,
        collection: &str,
    ) -> Option<std::sync::Arc<crate::physical::CollectionContract>> {
        self.contract_cache_map()
            .get(collection)
            .map(std::sync::Arc::clone)
    }

    /// Return (or lazily build) the in-memory contract map.
    /// Reparses PhysicalMetadataFile JSON only once per invalidation.
    /// Called 3× per insert (ensure_model, enforce_uniqueness, normalize_fields)
    /// so the cache is load-bearing for insert throughput.
    fn contract_cache_map(
        &self,
    ) -> std::sync::Arc<
        std::collections::HashMap<String, std::sync::Arc<crate::physical::CollectionContract>>,
    > {
        if let Ok(guard) = self.collection_contract_cache.read() {
            if let Some(map) = guard.as_ref() {
                return std::sync::Arc::clone(map);
            }
        }
        let contracts: Vec<crate::physical::CollectionContract> = self
            .physical_metadata()
            .map(|metadata| metadata.collection_contracts)
            .unwrap_or_default();
        let map: std::collections::HashMap<_, _> = contracts
            .into_iter()
            .map(|contract| (contract.name.clone(), std::sync::Arc::new(contract)))
            .collect();
        let arc = std::sync::Arc::new(map);
        if let Ok(mut guard) = self.collection_contract_cache.write() {
            *guard = Some(std::sync::Arc::clone(&arc));
        }
        arc
    }

    pub(crate) fn invalidate_collection_contract_cache(&self) {
        if let Ok(mut guard) = self.collection_contract_cache.write() {
            *guard = None;
        }
    }

    /// Single-file artifact only: mirror the current contract set into the
    /// store's auxiliary-metadata blob so it rides the binary dump. Without
    /// this the contracts live only in the in-memory cache and a collection's
    /// declared model (e.g. `kv`) is lost on reopen — recovery would re-infer
    /// it from the stored entities and a KV collection would come back as a
    /// table. No-op for other profiles, which persist contracts via the
    /// metadata sidecar.
    pub(crate) fn sync_single_file_contract_blob(&self) {
        let contracts = self.collection_contracts();
        let bytes = crate::physical::serialize_collection_contracts(&contracts);
        self.store().set_aux_metadata(bytes);
    }

    /// Seed the in-memory contract cache from the store's auxiliary-metadata
    /// blob (single-file artifact). Called on open so a collection's declared
    /// model survives a restart. Does nothing when the blob is absent (older
    /// V9 dumps) or empty.
    pub(crate) fn seed_contract_cache_from_store_aux(&self) -> std::io::Result<()> {
        let bytes = self.store().aux_metadata();
        if bytes.is_empty() {
            return Ok(());
        }
        let contracts = crate::physical::deserialize_collection_contracts(&bytes)?;
        let map: std::collections::HashMap<_, _> = contracts
            .into_iter()
            .map(|contract| (contract.name.clone(), std::sync::Arc::new(contract)))
            .collect();
        // Restore the per-collection state derived from contracts (context
        // index enablement + default TTLs) so the full collection definition —
        // not just the declared model — survives a restart.
        let store = self.store();
        let index = store.context_index();
        if let Ok(mut defaults) = self.collection_ttl_defaults_ms.write() {
            for contract in map.values() {
                index.set_collection_enabled(&contract.name, contract.context_index_enabled);
                if let Some(ttl_ms) = contract.default_ttl_ms {
                    defaults.insert(contract.name.clone(), ttl_ms);
                }
            }
        }
        if let Ok(mut guard) = self.collection_contract_cache.write() {
            *guard = Some(std::sync::Arc::new(map));
        }
        Ok(())
    }

    fn update_collection_contract_metadata<T, F>(
        &self,
        mutator: F,
    ) -> Result<T, Box<dyn std::error::Error>>
    where
        F: FnOnce(&mut PhysicalMetadataFile) -> T,
    {
        if !self.paged_mode
            || self.options.storage_profile.deploy_profile
                != crate::storage::DeployProfile::Embedded
            || self.options.storage_profile.packaging
                != crate::storage::StoragePackaging::SingleFile
        {
            return self.update_physical_metadata(mutator);
        }
        if self.options.read_only {
            return Err("physical metadata operations are not allowed in read-only mode".into());
        }
        let Some(path) = self.path() else {
            return Err("database path is not available".into());
        };

        // Legacy paged files keep contracts in the durable metadata sidecar,
        // not the embedded dump's auxiliary blob or native artifact summaries.
        // A definition edit must not rebuild every collection's search indexes.
        // Retain publication serialization and the canonical atomic writer.
        let _publication = self.store.vault_publication_lock.lock();
        let mut metadata = self.load_or_bootstrap_physical_metadata(false)?;
        let result = mutator(&mut metadata);
        metadata.save_for_data_path(path)?;
        Ok(result)
    }

    pub fn save_collection_contract(
        &self,
        contract: crate::physical::CollectionContract,
    ) -> Result<crate::physical::CollectionContract, Box<dyn std::error::Error>> {
        if let Ok(mut defaults) = self.collection_ttl_defaults_ms.write() {
            if let Some(ttl_ms) = contract.default_ttl_ms {
                defaults.insert(contract.name.clone(), ttl_ms);
            } else {
                defaults.remove(&contract.name);
            }
        }

        self.store()
            .context_index()
            .set_collection_enabled(&contract.name, contract.context_index_enabled);
        if let Some(manager) = self.store().get_collection(&contract.name) {
            let columns = contract
                .declared_columns
                .iter()
                .map(|column| column.name.clone())
                .collect();
            manager.set_column_schema_if_empty(columns);
        }

        // Existing paged files can be opened with embedded options. Their
        // checkpoints do not encode the binary dump's auxiliary contract blob.
        if self.options.storage_profile.deploy_profile == crate::storage::DeployProfile::Embedded
            && self.options.storage_profile.packaging
                == crate::storage::StoragePackaging::SingleFile
            && !self.paged_mode
        {
            if let Ok(mut guard) = self.collection_contract_cache.write() {
                let mut contracts = guard
                    .as_ref()
                    .map(|existing| existing.as_ref().clone())
                    .unwrap_or_default();
                contracts.insert(contract.name.clone(), std::sync::Arc::new(contract.clone()));
                *guard = Some(std::sync::Arc::new(contracts));
            }
            self.sync_single_file_contract_blob();
            return Ok(contract);
        }

        self.invalidate_collection_contract_cache();

        let saved = self.update_collection_contract_metadata(|metadata| {
            if let Some(existing) = metadata
                .collection_contracts
                .iter_mut()
                .find(|existing| existing.name == contract.name)
            {
                *existing = contract.clone();
            } else {
                metadata.collection_contracts.push(contract.clone());
            }
            metadata
                .collection_contracts
                .sort_by(|left, right| left.name.cmp(&right.name));

            if let Some(ttl_ms) = contract.default_ttl_ms {
                metadata
                    .collection_ttl_defaults_ms
                    .insert(contract.name.clone(), ttl_ms);
            } else {
                metadata.collection_ttl_defaults_ms.remove(&contract.name);
            }

            contract.clone()
        })?;
        self.invalidate_collection_contract_cache();
        Ok(saved)
    }

    pub fn remove_collection_contract(
        &self,
        collection: &str,
    ) -> Result<Option<crate::physical::CollectionContract>, Box<dyn std::error::Error>> {
        if let Ok(mut defaults) = self.collection_ttl_defaults_ms.write() {
            defaults.remove(collection);
        }

        self.store()
            .context_index()
            .set_collection_enabled(collection, false);

        if self.options.storage_profile.deploy_profile == crate::storage::DeployProfile::Embedded
            && self.options.storage_profile.packaging
                == crate::storage::StoragePackaging::SingleFile
            && !self.paged_mode
        {
            let mut removed = None;
            if let Ok(mut guard) = self.collection_contract_cache.write() {
                let mut contracts = guard
                    .as_ref()
                    .map(|existing| existing.as_ref().clone())
                    .unwrap_or_default();
                removed = contracts
                    .remove(collection)
                    .map(|contract| (*contract).clone());
                *guard = Some(std::sync::Arc::new(contracts));
            }
            self.sync_single_file_contract_blob();
            return Ok(removed);
        }

        self.invalidate_collection_contract_cache();

        let removed = self.update_collection_contract_metadata(|metadata| {
            let removed = metadata
                .collection_contracts
                .iter()
                .position(|contract| contract.name == collection)
                .map(|index| metadata.collection_contracts.remove(index));
            metadata.collection_ttl_defaults_ms.remove(collection);
            metadata
                .indexes
                .retain(|index| index.collection.as_deref() != Some(collection));
            removed
        })?;
        self.invalidate_collection_contract_cache();
        Ok(removed)
    }

    pub(crate) fn collection_ttl_defaults_snapshot(&self) -> BTreeMap<String, u64> {
        self.collection_ttl_defaults_ms
            .read()
            .map(|defaults| {
                defaults
                    .iter()
                    .map(|(collection, ttl_ms)| (collection.clone(), *ttl_ms))
                    .collect()
            })
            .unwrap_or_default()
    }

    pub(crate) fn load_collection_ttl_defaults_from_metadata(&self) {
        let metadata = self.physical_metadata();
        let defaults = metadata
            .as_ref()
            .map(|m| m.collection_ttl_defaults_ms.clone())
            .unwrap_or_default();

        if let Ok(mut current) = self.collection_ttl_defaults_ms.write() {
            current.clear();
            current.extend(defaults);
        }

        if let Some(metadata) = metadata {
            let store = self.store();
            let index = store.context_index();
            for contract in &metadata.collection_contracts {
                index.set_collection_enabled(&contract.name, contract.context_index_enabled);
            }
        }
    }

    /// Snapshot the live hypertable registry (specs + every chunk)
    /// into the sidecar-serialisable form. Called from
    /// [`persist_metadata`] so the chunk routing spine is durable on
    /// the same metadata path as collection contracts — issue #866.
    /// Returns an empty vec (and touches nothing) when no hypertable
    /// has ever been declared, so non-hypertable databases pay no
    /// persist cost.
    pub(crate) fn hypertable_registry_snapshot(&self) -> Vec<crate::physical::PhysicalHypertable> {
        let registry = self.hypertables();
        if registry.is_empty() {
            return Vec::new();
        }
        use std::collections::BTreeMap;
        let mut chunks_by_table: BTreeMap<String, Vec<crate::physical::PhysicalHypertableChunk>> =
            BTreeMap::new();
        for chunk in registry.snapshot_chunks() {
            chunks_by_table
                .entry(chunk.id.hypertable.clone())
                .or_default()
                .push(crate::physical::PhysicalHypertableChunk {
                    start_ns: chunk.id.start_ns,
                    end_ns_exclusive: chunk.end_ns_exclusive,
                    row_count: chunk.row_count,
                    min_ts_ns: chunk.min_ts_ns,
                    max_ts_ns: chunk.max_ts_ns,
                    sealed: chunk.sealed,
                    ttl_override_ns: chunk.ttl_override_ns,
                    columnar_page: chunk.columnar_page,
                    columnar_derived: chunk.columnar_page.is_some(),
                });
        }
        registry
            .list()
            .into_iter()
            .map(|spec| crate::physical::PhysicalHypertable {
                chunks: chunks_by_table.remove(&spec.name).unwrap_or_default(),
                name: spec.name,
                time_column: spec.time_column,
                chunk_interval_ns: spec.chunk_interval_ns,
                default_ttl_ns: spec.default_ttl_ns,
            })
            .collect()
    }

    /// Rehydrate the hypertable registry from the physical metadata
    /// sidecar at boot. Mirror of
    /// [`load_collection_ttl_defaults_from_metadata`] — specs and
    /// chunks are restored verbatim so bounds / routing / TTL are
    /// identical to the pre-restart state (issue #866).
    pub(crate) fn load_hypertables_from_metadata(&self) {
        let Some(metadata) = self.physical_metadata() else {
            return;
        };
        if metadata.hypertables.is_empty() {
            return;
        }
        let registry = self.hypertables();
        for hypertable in &metadata.hypertables {
            let mut spec = crate::storage::timeseries::HypertableSpec::new(
                hypertable.name.clone(),
                hypertable.time_column.clone(),
                hypertable.chunk_interval_ns,
            );
            if let Some(ttl) = hypertable.default_ttl_ns {
                spec = spec.with_ttl_ns(ttl);
            }
            registry.register(spec);
            for chunk in &hypertable.chunks {
                let meta = crate::storage::timeseries::ChunkMeta {
                    id: crate::storage::timeseries::ChunkId {
                        hypertable: hypertable.name.clone(),
                        start_ns: chunk.start_ns,
                    },
                    end_ns_exclusive: chunk.end_ns_exclusive,
                    row_count: chunk.row_count,
                    min_ts_ns: chunk.min_ts_ns,
                    max_ts_ns: chunk.max_ts_ns,
                    sealed: chunk.sealed,
                    ttl_override_ns: chunk.ttl_override_ns,
                    columnar_page: chunk.columnar_page,
                };
                let id = meta.id.clone();
                let columnar_page = meta.columnar_page;
                registry.restore_chunk(meta);
                if let Some(loc) = columnar_page {
                    if let Ok(Some(bytes)) = self.read_column_block_page(loc) {
                        registry.restore_columnar_block(&id, bytes);
                    }
                }
            }
        }
    }

    pub fn run_maintenance(&self) -> Result<(), Box<dyn std::error::Error>> {
        self.store.run_maintenance()?;
        self.persist_metadata()?;
        Ok(())
    }

    /// Path to the physical metadata sidecar, if persistent.
    pub fn metadata_path(&self) -> Option<PathBuf> {
        self.path
            .as_ref()
            .map(|path| PhysicalMetadataFile::metadata_path_for(path))
    }

    /// Inspect the current physical metadata view without publishing repairs.
    pub fn physical_metadata(&self) -> Option<PhysicalMetadataFile> {
        self.load_or_bootstrap_physical_metadata(false).ok()
    }

    /// Physical index registry derived for the current database state.
    pub fn physical_indexes(&self) -> Vec<PhysicalIndexState> {
        let indexes = self
            .physical_metadata()
            .map(|metadata| metadata.indexes)
            .unwrap_or_default();
        self.physical_indexes_from_declarations(indexes)
    }

    pub(crate) fn physical_indexes_from_declarations(
        &self,
        indexes: Vec<PhysicalIndexState>,
    ) -> Vec<PhysicalIndexState> {
        let indexes = Some(indexes)
            .filter(|indexes| !indexes.is_empty())
            .or_else(|| {
                self.native_physical_state()
                    .map(|state| self.physical_index_state_from_native_state(&state, None))
            })
            .unwrap_or_else(|| self.physical_index_state());
        self.reconcile_index_states_with_native_artifacts(indexes)
    }

    /// List registered named exports from the current physical metadata view.
    pub fn exports(&self) -> Vec<ExportDescriptor> {
        self.physical_metadata()
            .map(|metadata| metadata.exports)
            .or_else(|| {
                self.native_physical_state()
                    .map(|state| self.exports_from_native_state(&state))
            })
            .unwrap_or_default()
    }

    /// List recorded snapshots from the current physical metadata view.
    pub fn snapshots(&self) -> Vec<crate::physical::SnapshotDescriptor> {
        if let Some(metadata) = self.physical_metadata() {
            if !metadata.snapshots.is_empty() {
                return metadata.snapshots;
            }
        }
        self.native_physical_state()
            .map(|state| self.snapshots_from_native_state(&state))
            .unwrap_or_default()
    }

    /// List persisted named graph projections from the current physical metadata view.
    pub fn graph_projections(&self) -> Vec<PhysicalGraphProjection> {
        self.physical_metadata()
            .map(|metadata| metadata.graph_projections)
            .or_else(|| {
                self.native_physical_state()
                    .map(|state| self.graph_projections_from_native_state(&state))
            })
            .unwrap_or_default()
    }

    /// List graph projections declared in the catalog view.
    pub fn declared_graph_projections(&self) -> Vec<PhysicalGraphProjection> {
        self.catalog_model_snapshot().declared_graph_projections
    }

    /// List graph projections currently observed in the operational view.
    pub fn operational_graph_projections(&self) -> Vec<PhysicalGraphProjection> {
        self.graph_projections()
            .into_iter()
            .filter(|projection| {
                projection.last_materialized_sequence.is_some()
                    || matches!(projection.state.as_str(), "materialized" | "stale")
            })
            .collect()
    }

    /// List persisted analytics job metadata from the current physical metadata view.
    pub fn analytics_jobs(&self) -> Vec<PhysicalAnalyticsJob> {
        self.physical_metadata()
            .map(|metadata| metadata.analytics_jobs)
            .or_else(|| {
                self.native_physical_state()
                    .map(|state| self.analytics_jobs_from_native_state(&state))
            })
            .unwrap_or_default()
    }

    /// List analytics jobs declared in the catalog view.
    pub fn declared_analytics_jobs(&self) -> Vec<PhysicalAnalyticsJob> {
        self.catalog_model_snapshot().declared_analytics_jobs
    }

    /// List analytics jobs currently observed in the operational view.
    pub fn operational_analytics_jobs(&self) -> Vec<PhysicalAnalyticsJob> {
        self.analytics_jobs()
            .into_iter()
            .filter(|job| {
                job.last_run_sequence.is_some()
                    || matches!(
                        job.state.as_str(),
                        "running" | "completed" | "failed" | "queued" | "stale"
                    )
            })
            .collect()
    }

    /// List indexes declared in the catalog view.
    pub fn declared_indexes(&self) -> Vec<PhysicalIndexState> {
        self.catalog_model_snapshot().declared_indexes
    }

    /// List indexes currently observed in the operational view.
    pub fn operational_indexes(&self) -> Vec<PhysicalIndexState> {
        self.catalog_model_snapshot().operational_indexes
    }

    /// List reconciled index status entries from the catalog snapshot.
    pub fn index_statuses(&self) -> Vec<CatalogIndexStatus> {
        self.catalog_model_snapshot().index_statuses
    }

    /// Resolve one index status entry from the catalog snapshot.
    pub fn index_status(&self, name: &str) -> Option<CatalogIndexStatus> {
        self.catalog_model_snapshot()
            .index_statuses
            .into_iter()
            .find(|status| status.name == name)
    }

    /// Upsert a named graph projection in the persisted physical metadata.
    pub fn save_graph_projection(
        &self,
        name: impl Into<String>,
        node_labels: Vec<String>,
        node_types: Vec<String>,
        edge_labels: Vec<String>,
        source: impl Into<String>,
    ) -> Result<PhysicalGraphProjection, Box<dyn std::error::Error>> {
        let name = name.into();
        let source = source.into();
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            let projection = if let Some(existing) = metadata
                .graph_projections
                .iter_mut()
                .find(|projection| projection.name == name)
            {
                existing.updated_at_unix_ms = now;
                existing.state = "declared".to_string();
                existing.source = source.clone();
                existing.node_labels = node_labels.clone();
                existing.node_types = node_types.clone();
                existing.edge_labels = edge_labels.clone();
                existing.last_materialized_sequence = None;
                existing.clone()
            } else {
                let projection = PhysicalGraphProjection {
                    name: name.clone(),
                    created_at_unix_ms: now,
                    updated_at_unix_ms: now,
                    state: "declared".to_string(),
                    source: source.clone(),
                    node_labels: node_labels.clone(),
                    node_types: node_types.clone(),
                    edge_labels: edge_labels.clone(),
                    last_materialized_sequence: None,
                };
                metadata.graph_projections.push(projection.clone());
                projection
            };

            Self::mark_projection_dependent_jobs_stale(metadata, &name, now);

            metadata
                .graph_projections
                .sort_by(|left, right| left.name.cmp(&right.name));
            projection
        })
    }

    /// Mark a declared graph projection as materialized in the current physical metadata.
    pub fn materialize_graph_projection(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalGraphProjection>, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            let idx = metadata
                .graph_projections
                .iter()
                .position(|projection| projection.name == name);
            if let Some(idx) = idx {
                metadata.graph_projections[idx].updated_at_unix_ms = now;
                metadata.graph_projections[idx].state = "materialized".to_string();
                metadata.graph_projections[idx].last_materialized_sequence =
                    Some(metadata.superblock.sequence);
                let result = metadata.graph_projections[idx].clone();
                Self::rearm_projection_dependent_jobs_declared(metadata, name, now);
                return Some(result);
            }
            None
        })
    }

    /// Mark a declared graph projection as materializing.
    pub fn mark_graph_projection_materializing(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalGraphProjection>, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            let idx = metadata
                .graph_projections
                .iter()
                .position(|projection| projection.name == name);
            if let Some(idx) = idx {
                metadata.graph_projections[idx].updated_at_unix_ms = now;
                metadata.graph_projections[idx].state = "materializing".to_string();
                metadata.graph_projections[idx].last_materialized_sequence = None;
                let result = metadata.graph_projections[idx].clone();
                Self::mark_projection_dependent_jobs_stale(metadata, name, now);
                return Some(result);
            }
            None
        })
    }

    /// Mark a graph projection as failed.
    pub fn fail_graph_projection(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalGraphProjection>, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            let idx = metadata
                .graph_projections
                .iter()
                .position(|projection| projection.name == name);
            if let Some(idx) = idx {
                metadata.graph_projections[idx].updated_at_unix_ms = now;
                metadata.graph_projections[idx].state = "failed".to_string();
                metadata.graph_projections[idx].last_materialized_sequence = None;
                let result = metadata.graph_projections[idx].clone();
                Self::mark_projection_dependent_jobs_stale(metadata, name, now);
                return Some(result);
            }
            None
        })
    }

    /// Mark a graph projection as stale while preserving any last materialized sequence.
    pub fn mark_graph_projection_stale(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalGraphProjection>, Box<dyn std::error::Error>> {
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            let idx = metadata
                .graph_projections
                .iter()
                .position(|projection| projection.name == name);
            if let Some(idx) = idx {
                metadata.graph_projections[idx].updated_at_unix_ms = now;
                metadata.graph_projections[idx].state = "stale".to_string();
                let result = metadata.graph_projections[idx].clone();
                Self::mark_projection_dependent_jobs_stale(metadata, name, now);
                return Some(result);
            }
            None
        })
    }

    fn mark_projection_dependent_jobs_stale(
        metadata: &mut PhysicalMetadataFile,
        projection_name: &str,
        now: u128,
    ) {
        for job in metadata.analytics_jobs.iter_mut() {
            if job.projection.as_deref() == Some(projection_name) && job.state != "declared" {
                job.state = "stale".to_string();
                job.updated_at_unix_ms = now;
            }
        }
    }

    fn rearm_projection_dependent_jobs_declared(
        metadata: &mut PhysicalMetadataFile,
        projection_name: &str,
        now: u128,
    ) {
        for job in metadata.analytics_jobs.iter_mut() {
            if job.projection.as_deref() == Some(projection_name) && job.state == "stale" {
                job.state = "declared".to_string();
                job.last_run_sequence = None;
                job.updated_at_unix_ms = now;
            }
        }
    }

    /// Declare or update analytics job metadata without marking it as executed.
    pub fn save_analytics_job(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());
        if let Some(projection_name) = projection.as_deref() {
            if !self.graph_projection_is_declared(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is not declared in physical metadata"
                )
                .into());
            }
        }

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let job = if let Some(existing) = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)
            {
                existing.kind = kind.clone();
                existing.projection = projection.clone();
                existing.updated_at_unix_ms = now;
                existing.metadata = metadata_entries.clone();
                if existing.last_run_sequence.is_none() {
                    existing.state = "declared".to_string();
                }
                existing.clone()
            } else {
                let job = PhysicalAnalyticsJob {
                    id: job_id.clone(),
                    kind: kind.clone(),
                    state: "declared".to_string(),
                    projection: projection.clone(),
                    created_at_unix_ms: now,
                    updated_at_unix_ms: now,
                    last_run_sequence: None,
                    metadata: metadata_entries.clone(),
                };
                metadata.analytics_jobs.push(job.clone());
                job
            };

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            job
        })
    }

    /// Record or update analytics job metadata in the persisted physical metadata.
    pub fn record_analytics_job(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());
        if let Some(projection_name) = projection.as_deref() {
            if !self.graph_projection_is_declared(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is not declared in physical metadata"
                )
                .into());
            }
            if !self.graph_projection_is_operational(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is declared but not operationally materialized"
                )
                .into());
            }
        }

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let existing = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)?;
            existing.state = "completed".to_string();
            existing.kind = kind.clone();
            existing.projection = projection.clone();
            existing.updated_at_unix_ms = now;
            existing.last_run_sequence = Some(metadata.superblock.sequence);
            existing.metadata = metadata_entries.clone();
            let job = existing.clone();

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            Some(job)
        })
        .and_then(|job| {
            job.ok_or_else(|| {
                format!("analytics job '{job_id}' is not declared in physical metadata").into()
            })
        })
    }

    /// Mark a declared analytics job as running.
    pub fn queue_analytics_job(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());
        if let Some(projection_name) = projection.as_deref() {
            if !self.graph_projection_is_declared(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is not declared in physical metadata"
                )
                .into());
            }
            if !self.graph_projection_is_operational(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is declared but not operationally materialized"
                )
                .into());
            }
        }

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let existing = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)?;
            existing.state = "queued".to_string();
            existing.kind = kind.clone();
            existing.projection = projection.clone();
            existing.updated_at_unix_ms = now;
            existing.metadata = metadata_entries.clone();
            let job = existing.clone();

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            Some(job)
        })
        .and_then(|job| {
            job.ok_or_else(|| {
                format!("analytics job '{job_id}' is not declared in physical metadata").into()
            })
        })
    }

    /// Mark a declared analytics job as running.
    pub fn start_analytics_job(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());
        if let Some(projection_name) = projection.as_deref() {
            if !self.graph_projection_is_declared(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is not declared in physical metadata"
                )
                .into());
            }
            if !self.graph_projection_is_operational(projection_name) {
                return Err(format!(
                    "graph projection '{projection_name}' is declared but not operationally materialized"
                )
                .into());
            }
        }

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let existing = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)?;
            existing.state = "running".to_string();
            existing.kind = kind.clone();
            existing.projection = projection.clone();
            existing.updated_at_unix_ms = now;
            existing.metadata = metadata_entries.clone();
            let job = existing.clone();

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            Some(job)
        })
        .and_then(|job| {
            job.ok_or_else(|| {
                format!("analytics job '{job_id}' is not declared in physical metadata").into()
            })
        })
    }

    /// Mark a declared analytics job as failed.
    pub fn fail_analytics_job(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let existing = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)?;
            existing.state = "failed".to_string();
            existing.kind = kind.clone();
            existing.projection = projection.clone();
            existing.updated_at_unix_ms = now;
            existing.metadata = metadata_entries.clone();
            let job = existing.clone();

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            Some(job)
        })
        .and_then(|job| {
            job.ok_or_else(|| {
                format!("analytics job '{job_id}' is not declared in physical metadata").into()
            })
        })
    }

    /// Mark a declared analytics job as stale.
    pub fn mark_analytics_job_stale(
        &self,
        kind: impl Into<String>,
        projection: Option<String>,
        metadata_entries: BTreeMap<String, String>,
    ) -> Result<PhysicalAnalyticsJob, Box<dyn std::error::Error>> {
        let kind = kind.into();
        let job_id = Self::analytics_job_id(&kind, projection.as_deref());

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let existing = metadata
                .analytics_jobs
                .iter_mut()
                .find(|job| job.id == job_id)?;
            existing.state = "stale".to_string();
            existing.kind = kind.clone();
            existing.projection = projection.clone();
            existing.updated_at_unix_ms = now;
            existing.metadata = metadata_entries.clone();
            let job = existing.clone();

            metadata
                .analytics_jobs
                .sort_by(|left, right| left.id.cmp(&right.id));
            Some(job)
        })
        .and_then(|job| {
            job.ok_or_else(|| {
                format!("analytics job '{job_id}' is not declared in physical metadata").into()
            })
        })
    }

    /// Create a named export by copying the current database file and metadata sidecar.
    pub fn create_named_export(
        &self,
        name: impl Into<String>,
    ) -> Result<ExportDescriptor, Box<dyn std::error::Error>> {
        let name = name.into();
        if self.options.mode != StorageMode::Persistent {
            return Err("exports require persistent mode".into());
        }
        let Some(path) = self.path() else {
            return Err("database path is not available".into());
        };

        self.flush()?;

        let _publication = self.store.vault_publication_lock.lock();
        let mut metadata = match self.load_or_bootstrap_physical_metadata(true) {
            Ok(metadata) => metadata,
            Err(_)
                if self.options.storage_profile.deploy_profile
                    == crate::storage::DeployProfile::Embedded
                    && self.options.storage_profile.packaging
                        == crate::storage::StoragePackaging::SingleFile =>
            {
                crate::physical::PhysicalMetadataFile::from_state(
                    self.options.clone(),
                    self.catalog_snapshot(),
                    self.physical_collection_roots(),
                    self.physical_index_state(),
                    None,
                )
            }
            Err(err) => return Err(err),
        };
        let export_data_path = reddb_file::copy_physical_export_data_file(path, &name)?;
        let export_metadata_path = PhysicalMetadataFile::metadata_path_for(&export_data_path);
        let export_metadata_binary_path =
            PhysicalMetadataFile::metadata_binary_path_for(&export_data_path);

        let descriptor = ExportDescriptor {
            name: name.clone(),
            created_at_unix_ms: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis(),
            snapshot_id: metadata
                .snapshots
                .last()
                .map(|snapshot| snapshot.snapshot_id),
            superblock_sequence: metadata.superblock.sequence,
            data_path: export_data_path.display().to_string(),
            metadata_path: export_metadata_path.display().to_string(),
            collection_count: metadata.catalog.total_collections,
            total_entities: metadata.catalog.total_entities,
        };

        metadata
            .exports
            .retain(|export| export.name != descriptor.name);
        metadata.exports.push(descriptor.clone());
        self.prune_export_registry(&mut metadata.exports);
        metadata.save_for_data_path(path)?;
        metadata.save_to_binary_path(&export_metadata_binary_path)?;
        metadata.save_to_path(&export_metadata_path)?;

        Ok(descriptor)
    }

    /// Enable or disable a physical index entry in the persisted registry.
    pub fn set_index_enabled(
        &self,
        name: &str,
        enabled: bool,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let Some(status) = self.index_status(name) else {
            return Err(format!("index '{name}' is not present in catalog status").into());
        };
        if !status.declared {
            return Err(format!("index '{name}' is not declared in physical metadata").into());
        }
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            if let Some(index) = metadata.indexes.iter_mut().find(|index| index.name == name) {
                index.enabled = enabled;
                if !enabled {
                    index.build_state = "disabled".to_string();
                } else if index.build_state == "disabled" {
                    index.build_state = if index.artifact_root_page.is_some() {
                        "ready".to_string()
                    } else {
                        "declared-unbuilt".to_string()
                    };
                }
                index.last_refresh_ms = Some(now);
                return Some(index.clone());
            }
            None
        })
    }

    /// Mark a declared physical index as building in the persisted registry.
    pub fn mark_index_building(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let Some(status) = self.index_status(name) else {
            return Err(format!("index '{name}' is not present in catalog status").into());
        };
        if !status.declared {
            return Err(format!("index '{name}' is not declared in physical metadata").into());
        }
        if status.lifecycle_state == "disabled" {
            return Err(format!("index '{name}' is disabled").into());
        }
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            if let Some(index) = metadata.indexes.iter_mut().find(|index| index.name == name) {
                index.build_state = "building".to_string();
                index.last_refresh_ms = Some(now);
                return Some(index.clone());
            }
            None
        })
    }

    /// Mark a declared physical index as failed in the persisted registry.
    pub fn fail_index(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let Some(status) = self.index_status(name) else {
            return Err(format!("index '{name}' is not present in catalog status").into());
        };
        if !status.declared {
            return Err(format!("index '{name}' is not declared in physical metadata").into());
        }
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            if let Some(index) = metadata.indexes.iter_mut().find(|index| index.name == name) {
                index.build_state = "failed".to_string();
                index.last_refresh_ms = Some(now);
                return Some(index.clone());
            }
            None
        })
    }

    /// Mark a declared physical index as stale in the persisted registry.
    pub fn mark_index_stale(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let Some(status) = self.index_status(name) else {
            return Err(format!("index '{name}' is not present in catalog status").into());
        };
        if !status.declared {
            return Err(format!("index '{name}' is not declared in physical metadata").into());
        }
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            if let Some(index) = metadata.indexes.iter_mut().find(|index| index.name == name) {
                index.build_state = if index.enabled {
                    "stale".to_string()
                } else {
                    "disabled".to_string()
                };
                index.last_refresh_ms = Some(now);
                return Some(index.clone());
            }
            None
        })
    }

    /// Mark a declared physical index as ready in the persisted registry.
    pub fn mark_index_ready(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        self.warmup_index(name)
    }

    /// Mark a physical index as warmed up/refreshed in the persisted registry.
    pub fn warmup_index(
        &self,
        name: &str,
    ) -> Result<Option<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let Some(status) = self.index_status(name) else {
            return Err(format!("index '{name}' is not present in catalog status").into());
        };
        if !status.declared {
            return Err(format!("index '{name}' is not declared in physical metadata").into());
        }
        if status.lifecycle_state == "disabled" {
            return Err(format!("index '{name}' is disabled").into());
        }
        if !status.operational {
            return Err(
                format!("index '{name}' is declared but not operationally materialized").into(),
            );
        }
        let warmed_artifact = self
            .physical_indexes()
            .into_iter()
            .find(|index| index.name == name)
            .map(|mut index| {
                self.warmup_native_vector_artifact_for_index(&index)?;
                self.apply_runtime_native_artifact_to_index_state(&mut index)?;
                Ok::<_, String>(index)
            })
            .transpose()
            .map_err(|err| -> Box<dyn std::error::Error> { err.into() })?;

        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();
            if let Some(index) = metadata.indexes.iter_mut().find(|index| index.name == name) {
                if let Some(warmed) = warmed_artifact.as_ref() {
                    index.entries = warmed.entries;
                    index.estimated_memory_bytes = warmed.estimated_memory_bytes;
                    index.backend = warmed.backend.clone();
                    index.build_state = "ready".to_string();
                }
                index.last_refresh_ms = Some(now);
                return Some(index.clone());
            }
            None
        })
    }

    /// Rebuild physical index metadata from the current catalog, optionally restricted to one collection.
    pub fn rebuild_index_registry(
        &self,
        collection: Option<&str>,
    ) -> Result<Vec<PhysicalIndexState>, Box<dyn std::error::Error>> {
        let fresh = self.reconcile_index_states_with_native_artifacts(self.physical_index_state());
        self.update_physical_metadata(|metadata| {
            let now = SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap_or_default()
                .as_millis();

            let mut affected = Vec::new();
            let declared = metadata.indexes.clone();
            for declared_index in declared {
                let matches_collection = collection.is_none_or(|collection_name| {
                    declared_index.collection.as_deref() == Some(collection_name)
                });
                if !matches_collection {
                    continue;
                }

                let mut rebuilt = fresh
                    .iter()
                    .find(|index| index.name == declared_index.name)
                    .cloned()
                    .unwrap_or_else(|| {
                        let mut index = declared_index.clone();
                        index.build_state = "declared-unbuilt".to_string();
                        index
                    });
                rebuilt.enabled = declared_index.enabled;
                rebuilt.artifact_kind = rebuilt
                    .artifact_kind
                    .or_else(|| declared_index.artifact_kind.clone());
                rebuilt.artifact_root_page = rebuilt
                    .artifact_root_page
                    .or(declared_index.artifact_root_page);
                rebuilt.artifact_checksum = rebuilt
                    .artifact_checksum
                    .or(declared_index.artifact_checksum);
                rebuilt.build_state =
                    Self::finalize_rebuilt_index_build_state(&declared_index, &rebuilt);
                rebuilt.last_refresh_ms = Some(now);

                if let Some(existing) = metadata
                    .indexes
                    .iter_mut()
                    .find(|index| index.name == rebuilt.name)
                {
                    *existing = rebuilt.clone();
                } else {
                    metadata.indexes.push(rebuilt.clone());
                }

                affected.push(rebuilt);
            }

            affected
        })
    }

    fn finalize_rebuilt_index_build_state(
        declared: &PhysicalIndexState,
        rebuilt: &PhysicalIndexState,
    ) -> String {
        if !rebuilt.enabled {
            return "disabled".to_string();
        }

        if declared.build_state == "failed" || rebuilt.build_state == "failed" {
            return "failed".to_string();
        }

        let native_artifact_family = Self::native_artifact_kind_for_index(rebuilt.kind).is_some();
        if native_artifact_family {
            if rebuilt.artifact_root_page.is_some() && rebuilt.artifact_checksum.is_some() {
                return "ready".to_string();
            }
            if declared.artifact_root_page.is_some()
                || declared.artifact_checksum.is_some()
                || declared.artifact_kind.is_some()
            {
                return "stale".to_string();
            }
            return "declared-unbuilt".to_string();
        }

        if rebuilt.entries > 0 {
            return "ready".to_string();
        }

        if matches!(
            declared.build_state.as_str(),
            "stale" | "artifact-published" | "registry-loaded"
        ) {
            return "stale".to_string();
        }

        "declared-unbuilt".to_string()
    }
}