Struct TtlConfig 

pub struct TtlConfig {
    pub tombstone_ttl_hours: u32,
    pub tombstone_reaping_enabled: bool,
    pub days_between_reaping: u32,
    pub beacon_ttl: Duration,
    pub position_ttl: Duration,
    pub capability_ttl: Duration,
    pub evict_strategy: EvictionStrategy,
    pub offline_policy: Option<OfflineRetentionPolicy>,
}

TTL configuration for data lifecycle management

Provides collection-specific TTLs and eviction strategies that coordinate with tombstone TTL-based reaping.

Fields

tombstone_ttl_hours: u32

Tombstone TTL (hours)

Controls how long tombstones persist before being reaped.

tombstone_reaping_enabled: bool

Enable automatic tombstone reaping

days_between_reaping: u32

Days between tombstone reaping scans (default: 1)

beacon_ttl: Duration

Beacon soft-delete TTL (avoids husking)

Beacons are high-churn data. Use soft-delete pattern to mark as deleted rather than creating tombstones.

position_ttl: Duration

Node position soft-delete TTL (avoids husking)

capability_ttl: Duration

Capability hard-delete TTL

Capabilities are low-churn, coordinated updates. Safe to use hard delete (EVICT).

evict_strategy: EvictionStrategy

EVICT strategy for edge devices with storage constraints

offline_policy: Option<OfflineRetentionPolicy>

Offline retention policy (optional)

Implementations

impl TtlConfig

pub fn new() -> TtlConfig

Create a new TTL configuration with conservative defaults

pub fn tactical() -> TtlConfig

Tactical operations preset (high-frequency updates, short TTLs)

Optimized for:

• Rapid beacon discovery (5 min TTL)
• Frequent position updates (10 min TTL)
• Short-lived capabilities (2 hour TTL)
• Offline nodes keep only last 10 items

pub fn long_duration() -> TtlConfig

Long-duration operations preset (ISR, surveillance)

Optimized for:

• Longer beacon retention (10 min)
• Extended position history (1 hour)
• Long-lived capabilities (48 hours)

pub fn offline_node() -> TtlConfig

Offline/storage-constrained node preset

Optimized for:

• Minimal storage footprint
• Aggressive local eviction (EVICT, not DELETE)
• Short tombstone TTL (3 days instead of 7)

pub fn with_beacon_ttl(self, ttl: Duration) -> TtlConfig

Set beacon soft-delete TTL

pub fn with_position_ttl(self, ttl: Duration) -> TtlConfig

Set position soft-delete TTL

pub fn with_capability_ttl(self, ttl: Duration) -> TtlConfig

Set capability hard-delete TTL

pub fn with_eviction(self, strategy: EvictionStrategy) -> TtlConfig

Set eviction strategy

pub fn with_offline_policy(self, policy: OfflineRetentionPolicy) -> TtlConfig

Set offline retention policy

pub fn with_tombstone_ttl(self, hours: u32) -> TtlConfig

Set tombstone TTL (hours)

pub fn get_collection_ttl(&self, collection: &str) -> Option<Duration>

Get TTL for a specific collection

Returns the appropriate TTL based on collection name and current configuration.

Trait Implementations

impl Clone for TtlConfig

fn clone(&self) -> TtlConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TtlConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for TtlConfig

fn default() -> TtlConfig

Returns the “default value” for a type.