Add per-IP connection limits to SSE endpoint

[ogazboiz]

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Description

Stream stats endpoint (GET /events/stats) reports total connections but there is no per-user stream summary — how much has been streamed in, out, and how much is currently claimable across all active streams.

What Needs to Happen

• Add GET /v1/users/{address}/summary endpoint:
  • totalStreamsCreated, totalStreamedOut (sum of withdrawn amounts on outgoing)
  • totalStreamedIn (sum of withdrawn amounts on incoming)
  • currentClaimable (sum of claimable across all active incoming streams)
  • activeOutgoingCount, activeIncomingCount
• Useful for the dashboard stats cards and profile page
• Cache result for 30 seconds (hot path)

Files

• backend/src/routes/v1/stream.routes.ts
• backend/src/controllers/stream.controller.ts

Acceptance Criteria

• Endpoint returns accurate sums
• Cached for 30s to reduce DB load
• Works for addresses with no streams (all zeros)

[abdulqoyumadegoke]

@abdulqoyumadegoke has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this task

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[xeladev4]

@xeladev4 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi maintainer, I’d like to work on this issue.
I have experience building and securing Stellar/Soroban smart contracts. I focus on clean implementations.
I’ll ensure the solution follows the project’s architecture and security best practices.

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[drips-wave]

This issue has been completed by @xeladev4 as part of the Stellar Wave Program's 4th Wave 🥳

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