Optimize intents and FT token graph data fetching by loading only requested datasets initially

[Megha-Dev-19]

Description

Currently, when loading graphs for different tokens and time periods (1Y, 1W, 1D, 1H), we fetch all datasets in a single query upfront.

This is inefficient because:

• It increases initial load time.
• The frontend may not need all datasets immediately.

Proposed improvement:

• When the frontend requests data for a specific token and time period, fetch only that dataset from the backend and return it immediately.
• In the background, trigger fetches for the remaining datasets and store them in the database.
• The next time the frontend requests a different time period, the data will already be available in the DB.

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