QA Report

[code423n4]

no need for these curly brackets { }

Finding

File:   /src/modules/PRICE.sol

  {
            (, int256 ohmEthPriceInt, , uint256 updatedAt, ) = _ohmEthPriceFeed.latestRoundData();
             …
            reserveEthPrice = uint256(reserveEthPriceInt);
        }

https://github.com/code-423n4/2022-08-olympus/blob/main/src/modules/PRICE.sol#L160-L174

It is better to emit the oldDebt

Finding

File:         /main/src/modules/TRSRY.sol

emit DebtSet(token_, debtor_, amount_);

https://github.com/code-423n4/2022-08-olympus/blob/main/src/modules/TRSRY.sol#L134

Check for address(0)

Finding

File:           /main/src/modules/TRSRY.sol

 function setDebt(
        ERC20 token_,
        address debtor_,
        uint256 amount_
    ) external permissioned {
        uint256 oldDebt = reserveDebt[token_][debtor_];

        reserveDebt[token_][debtor_] = amount_;

        if (oldDebt < amount_) totalDebt[token_] += amount_ - oldDebt;
        else totalDebt[token_] -= oldDebt - amount_;

        emit DebtSet(token_, debtor_, amount_);
    }

https://github.com/code-423n4/2022-08-olympus/blob/main/src/modules/TRSRY.sol#L122-L135
https://github.com/code-423n4/2022-08-olympus/blob/main/src/policies/TreasuryCustodian.sol#L42-L48

Not the better pattern

It is better to make it as the other line above it. Like this one
_range.cushion.low.price = (movingAverage_ * (FACTOR_SCALE - cushionSpread)) / FACTOR_SCALE;

Finding

File:      /main/src/modules/RANGE.sol

        _range.cushion.high.price =
            (movingAverage_ * (FACTOR_SCALE + cushionSpread)) /
            FACTOR_SCALE;

https://github.com/code-423n4/2022-08-olympus/blob/main/src/modules/RANGE.sol#L168-L170

unnecessary invoking

These two invokes don’t do anything they are keep every thing the same
But if you trying to set the capacity to zero this is no how you do it

Finding

File:  /main/src/policies/Operator.sol

        _updateCapacity(true, 0);
        _updateCapacity(false, 0);

https://github.com/code-423n4/2022-08-olympus/blob/main/src/policies/Operator.sol#L202-L203