Netflow values are always positive

[kenkunz]

Issue

The data returned by chart?type=netflow endpoint is always positive. Deposit values should be positive, withdrawal values should be negative.

Steps to reproduce

The following steps could be reproduced with any live Enzyme-based strategy. The example below uses MATIC-USD breakout on Uniswap v3.

1. Open strategy overview page
2. Make a deposit; make note of the time and amount of USDC deposited (e.g., 2.0 USDC)
3. Make a withdrawal (using a different amount than in step 2); make note of the time and amount of USDC withdrawn (e.g., 1.07 USDC)
4. Wait a bit for the trade-executor chart data to reflect the updates
5. Request the netflow chart data for the strategy:

   curl https://enzyme-polygon-matic-usdc.tradingstrategy.ai/chart?type=netflow&source=live_trading | jq

6. Note the deposit and withdrawal values at the end of the data array
   • expected: deposit is positive value; withdrawal is negative
   • actual: deposit and withdrawal are both positive