Struct RetentionPolicy 

pub struct RetentionPolicy {
    pub max_age_days: Option<u32>,
    pub max_sessions: Option<u32>,
    pub orphan_max_age_days: Option<u32>,
}

保留策略：任一字段为 None 表示不限该维度。

Fields

max_age_days: Option<u32>

会话 endedAt 超过 max_age_days 被清理（未结束的会话不在本路径——孤儿见 RetentionPolicy::orphan_max_age_days）。

max_sessions: Option<u32>

按 startedAt 倒序保留 max_sessions 条，余者清理。

orphan_max_age_days: Option<u32>

孤儿清理（P23）：无 endedAt 且 startedAt 超过 orphan_max_age_days 的会话被清理， 覆盖崩溃/强杀/未登出直接退出产生的无收口会话（活跃会话由 protect 名单豁免）。 None = 不清孤儿（0.1.x 语义）。

Implementations

impl RetentionPolicy

pub fn is_empty(&self) -> bool

Trait Implementations

impl Clone for RetentionPolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RetentionPolicy

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

Formats the value using the given formatter.

impl Default for RetentionPolicy

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for RetentionPolicy

where RetentionPolicy: Default,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for RetentionPolicy

impl PartialEq for RetentionPolicy

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for RetentionPolicy

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RetentionPolicy