Bug: Net worth graph is incorrect for some account combinations

[zachgoll]

Describe the bug
A clear and concise description of what the bug is.

The net worth graph on the homepage is not being calculated properly for some combinations of accounts. Since net worth is a summation of all the transactions, balances, trades, etc. of the entire user's financial picture, this is likely due to one or more of the following factors (have not identified root cause yet):

• Currency conversions
• Sync dates missing
• Transfers not being excluded properly when calculating historical balances
• Investment portfolio security prices incorrect, or not available on certain dates