[Bug] Backend doesn't handle SIGTERM gracefully causing data loss

[Dev-AdeTutu]

Describe the Bug

When Docker/K8s sends SIGTERM to backend, process exits immediately without finishing in-flight requests or closing database connections, causing usage event data loss.

Steps to Reproduce

1. Start backend with active MQTT message processing
2. Send SIGTERM: docker stop container
3. Process exits immediately
4. In-flight usage updates lost
5. Database connections not closed properly

Expected Behavior

Implement graceful shutdown:

• Stop accepting new requests
• Finish processing in-flight requests (max 30s)
• Close MQTT connection
• Close database connections
• Exit with code 0

Actual Behavior

Immediate exit, potential data loss.

Environment

Field	Value
Component	backend
OS	Ubuntu 22.04 (Docker)
Network	testnet

[tecmalik]

@tecmalik has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

please i beg you please please assign me to this issue

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

[fatiu275]

@fatiu275 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I have checked the issue and the requirements look clear to me. I’m confident I can work on it and get the expected result.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @fatiu275 to this issue.

[Realericky]

@Realericky has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Kindly assign this to me. I will do a solid job

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

[drips-wave]

Congratulations, @Realericky! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Realericky: 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.

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