Status: IN
Hash-index hint uses a 24-byte fixed header per entry (`file_id:u32, offset:u64, size:u32, timestamp:f64`) while log-structured hint uses only an 8-byte header (`key_size:u32, offset:u32`), omitting file_id, timestamp, and record size
Source: entries/2026/05/29/topic-bitcask-startup-cost.md
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