Deduplicate identical notifications within a short window before persistence

[RUKAYAT-CODER]

Background

BackEnd/src/modules/notifications/notifications.service.ts persists and dispatches every event, so bursts of identical events (e.g. repeated status changes for the same entity) create duplicate rows and redundant sends, adding database and provider load.

Implementation Plan

• Compute a dedupe key (recipient+type+entityId) and guard inserts/dispatches with a short-window in-memory or Redis marker in notifications.service.ts
• Collapse duplicates that arrive within the window into a single notification
• Add benchmarks/metrics capturing before/after impact
• Add regression tests where applicable
• Document the change

Acceptance Criteria

• Measurable performance/efficiency improvement demonstrated with before/after numbers
• No regression in existing functionality
• Tests pass and code follows project standards
• Change is documented

[pixels26]

Hi maintainer, I'd love to fix this issue at the moment, please assign

[Adeyemi-cmd]

Hello maintainer. ii would love to work on this