Optimize queries

[dbaseqp]

No description provided.

[Copilot]

Pull request overview

This PR introduces a PostgreSQL materialized view to precompute cumulative team scores per round, reducing query cost for score graph endpoints.

Changes:

• Add cumulative_scores materialized view + unique index during DB connect.
• Switch cumulative score-by-round query to read from the materialized view instead of running a window function per request.
• Refresh the materialized view after each round (asynchronously) and after score resets.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
engine/engine.go	Triggers an async refresh of the cumulative scores materialized view after processing each round.
engine/db/servicechecks.go	Reads cumulative scores from cumulative_scores instead of computing via a window function on each call.
engine/db/rounds.go	Adds RefreshScoresMaterializedView() helper with concurrent refresh when possible.
engine/db/db.go	Creates the cumulative_scores materialized view and index at startup; refreshes it during ResetScores().
IMPLEMENTATION_SUMMARY.md	Documents the materialized view approach, refresh strategy, and rationale.

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[tire-fire]

Looks good to me