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The database powering tezos is extremely susceptible to crashes and corruption. Trash your datadir and import a fresh snapshot.
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ask tezos-node to tell me the contents of the block it would produce
No, because tezos-node does not create blocks. tezos-baker-0XX is responsible for creating blocks and it does not have an RPC interface. tezos-baker polls tezos-node first for rights, then if and only if, it is your turn, does tezos-baker then poll for the contents of mempool. tezos-baker ...
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