[Backend] Build a persistent idempotency framework for all inbound and async workflows

[Solomonsolomonsolomon]

Unify webhook idempotency, execution retries, event ingestion, and delayed transactions under durable replay-safe semantics. The design should survive restarts and support operator-assisted replay and recovery.nn- Priority: Highn- Area: Reliability / Integrationsn- Advanced Scope: durable processing, replay safety, async workflow semantics

[Emelie-Dev]

@Emelie-Dev has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I would love to work on this issue.

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

[Dev-Ben-Theo]

@Dev-Ben-Theo has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi maintainer, i'm a full stack developer with years of experience. i would love to work on this issue. kindly assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dev-Ben-Theo to this issue.

[jacintaaugustine]

@jacintaaugustine has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, As a senior developer, i reviewed the issue, very conversant with it and I'd love to work on it immediately!.

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