Backup.mutation: def of mylsm-lsm-store@0.6.0.1
Import: import mylsm-lsm-store@0.6.0.1/src/transfer/Backup.bend as Backup
Lines 184-188 of mylsm-lsm-store@0.6.0.1/src/transfer/Backup.bend: https://jend.leeeet.dev/read.txt?path=mylsm-lsm-store@0.6.0.1/src/transfer/Backup.bend&start_line=184&end_line=188

import Base
import mylsm-lsm-store@0.6.0.1/src/ByteMemTable.bend as ByteMemTable
import mylsm-lsm-store@0.6.0.1/src/ByteWal.bend as ByteWal

# Converts one surviving entry into its byte WAL put representation.
def mutation(entry: ByteMemTable.Entry) -> ByteWal.Mutation:
  match entry:
    case ByteMemTable.Entry{key, Some{value}}: ByteWal.Put{key, value}
    case ByteMemTable.Entry{key, None{}}: ByteWal.Delete{key}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/ByteMemTable.bend&name=Entry
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/ByteWal.bend&name=Mutation