Calculate and expose APR for 24h and 7d in indexer

[ebma]

Context

The portal should show the APR for 24h and 7d in the swap pool info table, see pendulum-chain/portal#590. These fields should be exposed by the indexer instead of calculating them in the frontend.

TODO

Check the calculation of the APR on the indexer of the Nabla team here and apply the same similar calculations to the pendulum indexers.

So we would then have:

• Rename apr to apr7d
• apr7d -> (total average fees last 7 days) / (total liability)
• apr24h -> (total average fees last 24 hours) / (total liability)

[prayagd]

Hey team! Please add your planning poker estimate with Zenhub @b-yap @ebma @gianfra-t @TorstenStueber

[prayagd]

Thank you for creating this ticket @ebma

[TorstenStueber]

I want to point out that the formula used by the Nabla team calculates the APR as follows:

• (total average fees per year) / (total supply)

Where total supply is the number of minted LP pool tokens. This is also the formula we are using at the moment.

However, we argued in this message and the one after that a more appropriate formula would be:

• (total average fees per year) / (total liability)

@pendulum-chain/product shall we change this as well in this ticket here?

[ebma]

Makes sense. So we would then have:

• apr -> (total average fees per year) / (total liability)
• apr7d -> (total average fees last 7 days) / (total liability)
• apr24h -> (total average fees last 24 hours) / (total liability)

right?

[TorstenStueber]

We would only have the apr7d and apr24h, correct? (the Nabla team basically defines apr as a synonym of apr7d).

[ebma]

Right. I changed the description of this ticket accordingly.