Transactions pre-confirmation dashboard

[ichorid]

We want to build a dashboard showing all the transactions currently in the Polygon mempool and the probability of those being mined in the next block. The dashboard must work real-time.

Roadmap:

• Normalize the scheme in the current database (to DRY and reduce the stored data)
• Convert the mempool history to use hosted Timescale DB (reduce storage size)
• Create a table with denormalized data for pending and just-mined transactions
• Implement a simple data-series-based algorithm for predicting the probability of a transaction being mined in the next block (gas-based)
• Add an endpoint for querying a transaction's probability of being mined within the next X blocks (for use with Policy Vault and Keyper Wallet)
• Design and implement the frontend for the new element of the dashboard (pending transactions and probabilities)