Implement Soroban event stream indexer (Horizon event subscribe)

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Implement Soroban event stream indexer (Horizon event subscribe)

Labels: observability, infrastructure, priority/high
Difficulty: High · Effort: L
Backlog slot: 58

Problem Statement

No durable event subscription pipeline. Users resort to manually polling.

Why it Matters

• Off-chain UI components need real-time updates.

Expected Outcome

1. Implement crates/tools/src/indexer.rs that runs as orbitchain-cli indexer run --network <net>.
2. Streams Events from Horizon and pushes to a webhook or Postgres.

Acceptance Criteria

• Indexer survives throughput of ≥ 100 events/sec.

Files Likely Affected

• New: crates/tools/src/indexer.rs

Dependencies

Issue #43.

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[neromtoobad]

Hi, I'd like to work on this issue. I'm a Rust/Soroban developer with solid smart-contract and CI tooling experience. I can deliver in 12 hrs. Looking forward to contributing.

[grantfox-oss]

🦊 GrantFox — @neromtoobad has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #145)
2. Your PR will be reviewed by the OrbitChainLabs maintainers

Good luck! Track your progress on GrantFox.