Improve price history chart

[jondubois]

Currently, the chart only loads data from the last 100 trades and it reloads the records from the API from time to time.

• Allow the user to view the price history further back into the past. Possibly with some kind of interactivity so that the user can scroll through the graph and it loads more data on demand. This data could be loaded directly from the blockchain HTTP APIs or it may be better to create a new API endpoint which aggregates price history data in a more efficient way. Any new backend solution should be packaged as an LDEM https://github.com/jondubois/ldem module to ensure that the historical price data can be served in a decentralized way.
• Consider loading the trades/price data more efficiently (instead of fetching all the latest 100 every time).

[jondubois]

@sacOO7 Feel free to propose a solution before implementing.

[sacOO7]

Yes.. I for this ... we probably need to make changes to the backend... probably an API that can return data based on pagination. Also, should tell us new transactions available based on last ID passed.

[sacOO7]

Let me know your thoughts on this, once you get free @jondubois

[jondubois]

The new DEX /prices/recent endpoint supports cursor pagination so we could use this one, but this approach is not as decentralized as reading the price data directly from the affected blockchains and calculating price history on the client side (which is how it works now). It would be nice if the user could choose between the two options depending on their needs.