Update Accuracy API to use ETL + DuckDB

[KatunaNorbert]

On the ETL + DuckDB flow the Accuracy data endpoint that we use to serve accuracy data to pdr-web trough an API it's broken because of some slot fetching updates. Before merging the ETL + DuckDB we should make sure that the Accuracy endpoint is also working.
While on this we should also use the data from the ETL to calculate the Accuracy instead of fetching and storing the data separately.

Dod:

• Fix Accuracy endpoint so it fetches and serves data correctly with the new subgraph fetching changes
• Integrate ETL + DuckDB so the accuracy endpoint uses ETL to fetch and store data