Struct SessionTurnMetadata 

pub struct SessionTurnMetadata {
    pub applied_personality_id: Option<String>,
    pub applied_personality_prompt_hash: Option<String>,
    pub instruction_conversation_id: Option<String>,
    pub model: String,
    pub provider_conversation_id: Option<String>,
    pub questions_json: String,
    pub summary: String,
    pub token_usage_delta: SessionStats,
}

Transactional turn-metadata payload persisted after one completed agent turn.

Owns its fields so the persistence trait method stays lifetime-free. A borrowed variant (SessionTurnMetadata<'a>) forced the persist method to carry a generic lifetime, which mockall::automock drops in the generated mock and newer clippy then rejects via extra_unused_lifetimes. Owning the data is allocation-cheap on this once-per-turn path and keeps the trait signature stable across toolchains.

Fields

applied_personality_id: Option<String>

Personality id successfully delivered for this turn, or None when the turn cleared or had no personality.

applied_personality_prompt_hash: Option<String>

Fingerprint of the personality prompt successfully delivered for this turn.

instruction_conversation_id: Option<String>

Session-scoped instruction bootstrap marker for app-server providers.

model: String

Model identifier used for per-model usage aggregation.

provider_conversation_id: Option<String>

Persisted provider-native conversation identifier for future resumes.

questions_json: String

Serialized clarification-question payload stored on the session row.

summary: String

Serialized structured summary payload stored on the session row.

token_usage_delta: SessionStats

Token-usage delta attributed to the completed turn.