Add structured log for alert registration with creator ID, direction, and target price

[Chucks1093]

Summary

When a price alert is successfully registered, a structured log entry makes the registration observable without querying the alerts table. It also helps debug cases where an alert fires unexpectedly.

Scope

• Emit a structured info log on successful alert creation with fields: alert_id, creator_id, direction, target_price, registered_at
• Emit a structured info log on alert deletion (manual cancel) with fields: alert_id, creator_id, cancelled_at
• Do not log callback_url or wallet_address raw — mask wallet to first 4 and last 4 chars

Acceptance Criteria

• Registration log emitted with all five fields
• Cancellation log emitted on manual delete
• Wallet address masked, callback URL absent from all logs

ETA: 12 hours

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Coordinate on Telegram

[extolkom]

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Pls assign me

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[shadrach68]

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please assign me this

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[wagmiiii]

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i want this issue

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[Sam-Rytech]

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Hi maintainer

Please I'd like to work on this issue

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[Ademiitura]

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[Manuelshub]

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Hello maintainer @Chuks1093, I'd love to work on this issue, can I take a stab at it??

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[drips-wave]

Congratulations, @wagmiiii! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@wagmiiii's PR #527 was approved and merged by @Chucks1093.

🏆 @wagmiiii: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (328 total points). Track your full progress on GrantFox.

👏 Great work, @wagmiiii! Keep contributing to accesslayerorg.

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This issue has been completed by @wagmiiii as part of the Stellar Wave Program's 6th Wave 🥳

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