[Backend] -- Add Analytics Aggregation Jobs with Backfill Support

[Devsol-01]

Description:
Analytics endpoints often compute aggregates over many records. Offload heavy aggregation to background jobs and support backfills.

Implement:

• daily/hourly aggregation jobs
• ability to backfill a time range
• ensure job results are idempotent

Acceptance Criteria:

• Aggregation job pipeline exists.
• Backfill endpoint/job supported.
• Analytics queries read from precomputed tables when possible.

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[Kenisank]

@Kenisank has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, I would like to work on this issue.

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[Menjay7]

@Menjay7 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

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[Kezlarry]

@Kezlarry has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please maintainer assign this issue to me I'm confident that I can solve it my eta is 4 hours

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[drips-wave]

Congratulations, @Menjay7! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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