Struct AppliedCompaction 

#[non_exhaustive]
pub struct AppliedCompaction {
    pub session: Session,
    pub api_messages: Vec<Arc<Value>>,
    pub previous_session_id: String,
    pub chains_advanced: Vec<String>,
    pub policy: CompactionPolicy,
}

What the engine applied. Pure data — the frontend adopts these fields; all persistence already happened (successor-first save ordering).

TYPED ENTRY (fix1 T36 strengthening): #[non_exhaustive] prevents downstream crates from constructing this transition result directly — the supported way for a frontend to obtain an AppliedCompaction is to call apply_compaction, so “every frontend compacts through the one engine transition” is compiler-enforced, not convention.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

session: Session

Session to adopt (successor, or the in-place-updated session).

api_messages: Vec<Arc<Value>>

History to adopt (canonical summary context + flushed events/queue).

previous_session_id: String

The session id that was compacted.

chains_advanced: Vec<String>

Named chains whose heads advanced to the successor.

policy: CompactionPolicy

The policy that was applied.

Trait Implementations

impl Clone for AppliedCompaction

fn clone(&self) -> AppliedCompaction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AppliedCompaction

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

Formats the value using the given formatter.