Implement Contract Event Push to Backend via Signed Webhook

[RUKAYAT-CODER]

Overview

The backend polls on-chain state on demand. There is no mechanism for the contract or a Horizon event indexer to push events to the backend, causing latency in status updates.

Specifications

Features:

• Horizon event streaming script that listens to contract topic events
• Signs events with a shared secret and POSTs to backend webhook endpoint
• Backend webhook handler verifies signature and updates DB

Tasks:

• Create scripts/event-indexer.ts using Stellar SDK SSE
• Wire to existing WebhooksController in backend
• Add integration test

Impacted Files:

• contracts/earn-quest/examples/indexer-example.ts (extend)
• BackEnd/src/modules/webhooks/webhooks.controller.ts`n

Acceptance Criteria:

• On-chain events delivered to backend within 10s
• Backend DB status updated on receipt

[Senorespecial]

I would love to work on this issue, please assign the issues to me so i Can work on it ASAP

[grantfox-oss]

🦊 GrantFox — @Senorespecial has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #1717)
2. Your PR will be reviewed by the EarnQuestOne maintainers

Good luck! Track your progress on GrantFox.

[kimanicode]

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

Mind assigning this to me ? I'll take this on. I will build out the SSE event-streaming script in scripts/event-indexer.ts using the Stellar SDK to monitor the contract's topic events in real time.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kimanicode to this issue.