Example: a Plaid investment transaction with
Securities.ticker_symbol: "AAPL", Investment_transactions.quantity: 5, Investment_transactions.amount: 925.25, Investment_transactions.iso_currency_code: "USD", Investment_transactions.date: "2024-01-15", Investment_transactions.type: "buy" maps to Meld symbol: "AAPL", quantity: 5, amount: 925.25, currency: "USD", transactionDate: "2024-01-15", type: "buy".