Emit Event for Subscription Updates

[Abd-Standard]

Description
Emit a dedicated event whenever a user updates an existing subscription.

Acceptance Criteria
Subscription update triggers an event.
Event includes relevant subscription details.
Tests verify event emission.

[ebubeb683-ship-it]

Hello boss, Please assign this issue to me. i checked it out and im confident i will solve it
my eta is 4 hours

[Joyful12-tech]

Hello Maintainer,
I'd like to work on this issue. I'll implement the subscription update event, add tests, and submit a quality PR within 2 days.
Thank you!

[AbuTuraab]

@AbuTuraab has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi,

I’d like to request assignment to this issue.

As a full-stack developer working actively in the Stellar ecosystem, I understand how important robust automation is for projects that combine Soroban smart contracts, backend services, and frontend applications. A reliable CI/CD pipeline is the backbone of safe contract development, deterministic builds, and predictable testnet releases.

During the previous waves of contributions, I worked on several Stellar-related repos where I resolved issues such as:
Frontend implementations.
Misconfigured GitHub Actions leading to failing builds
Missing or incomplete Soroban contract test pipelines
Frontend pipelines that didn’t catch build/lint errors
Inefficient caching (Rust, pnpm) that slowed down CI
Incorrect workflow permissions affecting deployment and artifact uploads
These issues helped me develop a strong sense of what healthy CI/CD should look like for blockchain projects.

Relevant Skills
Full-stack expertise with Soroban, Rust, TypeScript, and modern frontend tooling
Strong experience designing and maintaining GitHub Actions workflows
Familiar with contract testing, reproducible builds, and blockchain dev best practices
Experience with pnpm-based frontend CI pipelines (install, lint, type-check, build)
Comfortable implementing secure deployment flows, secret management, and workflow permission hardening
Confident in making pipelines faster and more reliable using smart caching strategies

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

[MAN7A-afk]

@MAN7A-afk has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'll work on this issue

Plan is to add a SubscriptionUpdated event that fires whenever an existing subscription's details change — probably include the subscriber address, subscription ID, and whatever fields actually changed (or just the new state, depending on what's cleanest given the existing struct). I'll write tests to confirm the event fires on update and that it's not emitted on unrelated calls (like a fresh subscription creation, which should stay separate).

One thing I want to confirm — should this event replace any existing generic "SubscriptionModified" type event if one exists, or live alongside it? Will check the contract first, but flagging in case you already have a preference.

Starting a branch for this shortly.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @MAN7A-afk to this issue.

[drips-wave]

Congratulations, @MAN7A-afk! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @MAN7A-afk: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@MAN7A-afk's PR #447 was approved and merged by @Abd-Standard.

🏆 @MAN7A-afk: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,172 total points). Track your full progress on GrantFox.

👏 Great work, @MAN7A-afk! Keep contributing to Core-Foundry.