Ge Gao

Add conn metric

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## Description Describe the changes or additions included in this PR. ## Test plan How did you test the new or updated feature? --- ## Release notes Check each box...

schema cleanup: drop network_total_transactions from checkpoints

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## Description title, more contexts can be found in https://linear.app/mysten-labs/issue/DP-63/clean-up-network-total-transactions-vs-max-tx-sequence-number-and-min ## Test plan ci to ensure no references to this column any more --- ## Release notes Check each box...

indexer JSON RPC: derive object changes instead

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## Description Derive JSON RPC object changes based on sender_signed_data and effects, so that we do not have to store object_changes in the transactions table. https://linear.app/mysten-labs/issue/DP-65/clean-up-object-changes-in-transactions ## Test plan How...