- load init price from DB if possible, else fetch from API
- store the price history in DB every 1 hr
- get the 24hr-past-rate from DB
- update the last tx timestamp upon successful transaction
- added priceHistory table to SQL schema and backup
- Update current_price when no seller or buyer available.
- Inc price only when sell-orders from rated sellers are available.
- User must buy a minimum FLO before placing a sell order unless they are a 'Miner'.