[Backend] No HTTP timeout/retry-backoff on Soroban RPC calls - a hung RPC stalls the indexer poll loop and request handlers

[grantfox-oss]

Telegram (ask questions / claim the issue here first): https://t.me/+DOylgFv1jyJlNzM0

Why this matters

sorobanService.ts builds rpc.Server and awaits server.simulateTransaction/getAccount/sendTransaction with no client-side request timeout - TransactionBuilder.setTimeout(30) only sets the tx validity window, not an HTTP deadline. soroban-indexer.service.ts:87 and the controller stale-fallback path await these with no AbortController/timeout, so a non-responsive endpoint blocks the poll cycle and the request thread. No retry/backoff on transient RPC failures.

Acceptance criteria

• Wrap Soroban RPC/fetch calls with an AbortController + configurable timeout
• Add bounded retry with exponential backoff for transient getEvents/simulate failures
• Surface a metric/log when RPC latency exceeds the timeout

Files to touch

• backend/src/services/sorobanService.ts
• backend/src/services/soroban-indexer.service.ts
• backend/src/controllers/stream.controller.ts

Out of scope

• Choosing a specific RPC provider

[Gogo-Eng]

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I will love to work on this issue

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[extolkom]

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

Please assign me

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[samjay8]

@samjay8 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Boss, I will like to work on this.

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