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029ba1a21d
Moved CBlockUndo disk read lookups from child index classes to the base index class. The goal is for child index classes to synchronize only through events, without directly accessing the chain database. This change will enable future parallel synchronization mechanisms, reduce database access (when batched), and contribute toward the goal of running indexes in a separate process (with no chain database access). Besides that, this commit also documents how NextSyncBlock() behaves. It is not immediately clear this function could return the first block after the fork point during a reorg.