Cardano Updates

    Fixes https://github.com/IntersectMBO/cardano-db-sync/issues/2083#issuecomment-4110278201
    for 13.6.0.5.
    The planner sometimes uses a query similar to

    Index Scan using tx_pkey on tx
      Filter: (block_id >= $1)

    the filter is not Index Cond, so this ends up in a sequential scan.
    The index refers to the primary key and is only used for sorting.
    Instead we want to use

    Sort (top-N heapsort)
      -> Index Scan using idx_tx_block_id
           Index Cond: (block_id >= $1)

    With this change we're forcing a similar plan

    Aggregate
      -> Index Scan using idx_tx_block_id
           Index Cond: (block_id >= $1)

    making sure we're using the Index Cond and then sorting.

Fixes https://github.com/IntersectMBO/cardano-db-sync/issues/2083#issuecomment-4110278201
The planner sometimes uses a query similar to

Index Scan using tx_pkey on tx
  Filter: (block_id >= $1)

the filter is not Index Cond, so this ends up in a sequential scan.
The index refers to the primary key and is only used for sorting.
Instead we want to use

Sort (top-N heapsort)
  -> Index Scan using idx_tx_block_id
       Index Cond: (block_id >= $1)

With this change we're forcing a similar plan

Aggregate
  -> Index Scan using idx_tx_block_id
       Index Cond: (block_id >= $1)

making sure we're using the Index Cond and then sorting.

Fix missing Conway genesis

Fixes https://github.com/IntersectMBO/cardano-db-sync/issues/2034
This forces ConwayGenesisFile to always exist.

2041 - fix isolation commits