Kostas Dermentzis

Additionally is there any efficient helper function to get the number of blocks made in the current epoch? We will most probably define `startIndex = resultSize * blocksMade`

Hm I guess folding this mapping for _every_ block may not be that efficient. Maybe we can have conditions to stop this folding when `blocksCounter * resultSize >= stake.size` or...

This currently seems suprisingly slow ``` cexplorer=# select min (block_no) from block where epoch_no = 319; min --------- 6842099 (1 row) Time: 1172,601 ms (00:01,173) ``` We would need to...

I wouldn't rely on the auto-incremental block.id, but yes we can find some other query ``` select count(*) from block where epoch_no = 319; count ------- 8401 (1 row) Time:...

The auto-incremental block.id is managed internally by postgtres, its behaviour changes between postrges versions and there have been reports about it misbehaving https://github.com/input-output-hk/cardano-db-sync/issues/974. Counting blocks of epoch seems more clear...

I've implemented this [here](https://github.com/input-output-hk/cardano-db-sync/pull/1086/files#diff-b5afcb79b851e1393424098f9ea53a878dd64d5215e6d8b29539e1d5db8af015R68), any review would be welcome. I extract a slice from the `_delegations` of the snapshot and query the `_stake` for each stake credentials. I'm not sure...

I'll take a look at these next days.

> What do you mean by "return a passing Result"? The property doesn't fail

Yes, this is what I meant. I personally agree a bit more with the second option: make `runParallelCommands` fail on exceptions, since it doesn't complete histories.

> Another way to think of it is that `runParallelCommands` should be used when there's no fault injection (exceptions), while `runParallelCommands'` should be used when there's fault injection. Yes exactly.