account/balance endpoint returns incorrect historical rewards for stake1 addresses

## Context & versions
Version: 1.3.2
Network: mainnet
Environment: Docker with docker-compose
Configuration: default

## Steps to reproduce
1. Execute the account/balance endpoint for a stake1 address with a past block number.

## Actual behavior
cardano-rosetta-java
> curl -s http://localhost:8080/account/balance -H 'Content-Type: application/json' --data-binary '{"network_identifier":{"blockchain": "cardano","network": "mainnet"},"block_identifier":{"index":"12335081"},"account_identifier": {"address":"stake1uxk8c5xl52mfcn8nppuktdvzaw6lsjwdnerfw7rszk6z3nqm5nagh","metadata": {}}}' | jq
{
"block_identifier": {
"index": 12335081,
"hash": "03c02b815911af94c6e96debbc55d5eb4aac636d57fd95e8716e06c5abd5980b"
},
"balances": [
{
"value": "0",
"currency": {
"symbol": "ADA",
"decimals": 6
}
}
]
}

cardano-rosetta
> curl -s http://localhost:8080/account/balance -H 'Content-Type: application/json' --data-binary '{"network_identifier":{"blockchain": "cardano","network": "mainnet"},"block_identifier":{"index":"12335081"},"account_identifier": {"address":"stake1uxk8c5xl52mfcn8nppuktdvzaw6lsjwdnerfw7rszk6z3nqm5nagh","metadata": {}}}' | jq
{
"block_identifier": {
"index": 12335081,
"hash": "03c02b815911af94c6e96debbc55d5eb4aac636d57fd95e8716e06c5abd5980b"
},
"balances": [
{
"value": "927048",
"currency": {
"symbol": "ADA",
"decimals": 6
}
}
]
}

## Expected behavior
The account/balance endpoint should return the historical unwithdrawn rewards as they were at the specified block.

Start with the account/balance endpoint and reproduce the request against mainnet at block 12335081 using the supplied stake1 address. Trace how historical unwithdrawn rewards are selected for stake addresses, then compare the result with the cardano-rosetta response. Done means the endpoint returns 927048 ADA at that block, matching the expected historical balance.

Written by the indexing model from the issue text.