feat[backend](ingestion_stats): fixed default time window for ingesti…

[AlexSanchez-bit]

No description provided.

[github-actions]

🛑 AI review — High/critical findings

One or more high/critical issues were found. Please review and fix before merging if they're real.

✅ architecture (gemini-3-flash-lite) — clean

Summary: Refactored defaultStatsWindow constant from time.Duration to string within eventprocessing usecase.

No findings.

🛑 bugs (gemini-3-flash-lite) — high/critical — please review

Summary: Changed defaultStatsWindow constant from time.Duration to string, causing type mismatch in resolveWindow.

• high backend/modules/eventprocessing/usecase/ingestion_stats.go:16 — defaultStatsWindow was changed from a time.Duration to a string ("24h"). If it is used elsewhere in the codebase as a time.Duration, this will cause compilation errors or type mismatches. Ensure all usages of defaultStatsWindow are updated or revert the type change.

✅ security (gemini-3-flash-lite) — clean

Summary: Routine refactoring of event processing ingestion stats window constant from time.Duration to string.

No findings.

🟢 go-deps — up to date

No pending Go dependency updates.

[AlexSanchez-bit]

that constant is only used there