[Epic] Calculate user liquidity positions

[shrnkld]

Work in progress - not ready to start!

Task 1: Extend the data model

Description:
Add a new table to the database schema to store user liquidity positions.

To do:

• Create a new table named UserLiquidity.
• Define columns: id, user_address, token_address, native_asset_address, liquidity, block_id, and timestamp.

Task 2: Update the EventProcessor class

Description:
Update the EventProcessor class to calculate user liquidity positions and store them in the newly created UserLiquidity table.

To do:

• Modify the _process() method in the EventProcessor class to calculate user liquidity positions.
• Retrieve user transactions related to token pairs being tracked.
• Calculate user liquidity positions for each block based on their transactions.
• Store calculated user liquidity positions in the UserLiquidity table.
• Leverage Redis cache to avoid redundant calculations.

Task 3: Write tests for the new functionality

Description:
Write unit tests to ensure the new functionality works as expected and the data is stored correctly in the UserLiquidity table.

To do:

• Write unit tests for the modified _process() method in the EventProcessor class.
• Test that the user liquidity positions are calculated correctly and stored in the UserLiquidity table.
• Test the integration with Redis cache.

Task 4: Update the API to return user liquidity positions

Description:
Update the API to return user liquidity positions.

To do:

• Add an endpoint to the API to return user liquidity positions.
• Implement necessary queries in the backend to fetch data from the UserLiquidity table.