SSTable is an immutable, sorted on-disk table flushed from a [`MemTable`]. Each SSTable file stores entries in sorted key order using the binary format: ```text [ key_len: usize ][ key: [u8] ][ deleted: u8 ][ val_len: usize ][ value: [u8] ][ timestamp: u128 ] ``` `val_len` and `value` are omitted for deleted (tombstone) entries. An in-memory offset index enables O(log n) binary search without
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