[FEAT] Backend: Implement Soroban Event Indexer

[ogazboiz]

Description

Create a service to keep the Postgres database in sync with on-chain events.

Tasks

• Setup a polling service using Stellar RPC.
• Index StreamCreatedEvent to create database records.
• Update database status on StreamCancelledEvent and TokensWithdrawnEvent.

Context

Ensures the frontend dashboard remains fast and accurate without overloading the RPC node.

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[CMI-James]

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[estyemma]

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[gelluisaac]

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I’m interested in tackling this! I have a strong background in smart contract development and full-stack systems, so I'm well-equipped to handle the requirements here. Could you please assign this to me?

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[MerlinTheWhiz]

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Let me handle this ASAP

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