Function resolve_and_apply_changeset 

pub fn resolve_and_apply_changeset(
    conn: &Connection,
    store_dir: &StoreDir,
    bytes: &[u8],
    tables: &[SyncedTable],
    receiver_wall_ms: u64,
) -> Result<ApplyResult, DbError>

Apply bytes to conn, resolving conflicts (premerge + row arbitration), building the TableSchema from tables once. A convenience wrapper over resolve_and_apply_changeset_with_schema for callers that apply a single changeset and don’t already hold a schema (tests, snapshot round-trips).

receiver_wall_ms is the receiver’s current wall-clock millis, against which a grossly-future incoming _updated_at is refused (see arbitrate_row_conflict).