feat(ai): add per-user daily token budget guard - #877
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MaryammAli merged 1 commit intoSep 25, 2026
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Adds AiTokenBudgetService (tracks token usage per (userId, endpoint) against a daily budget, following the in-process sliding-window pattern already used by NotificationRateLimiter) and AiTokenBudgetGuard, a NestJS CanActivate guard applied via @UseGuards(AiTokenBudgetGuard) that rejects requests once a user's daily budget is exhausted with 429 TOKEN_BUDGET_EXCEEDED, a Retry-After header, and an ISO resetAt timestamp. getUsageSnapshot() exposes per-user/endpoint usage for metrics export.
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Closing — this PR targeted the wrong backend directory (app/backend instead of BackendAcademy, where this feature area actually lives). Reopening against the correct location. |
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Adds a per-user daily token budget for AI Mentor endpoints (BE-072).
AiTokenBudgetServicetracks token usage per(userId, endpoint)against a daily budget, following the same in-process sliding-window pattern already used byNotificationRateLimiterAiTokenBudgetGuard— a NestJSCanActivateguard applied via@UseGuards(AiTokenBudgetGuard)— rejects requests once a user's daily budget is exhausted with429 TOKEN_BUDGET_EXCEEDED, aRetry-Afterheader, and an ISOresetAttimestampgetUsageSnapshot()exposes per-user/endpoint usage for metrics exportRuns in-process for now; a multi-instance deployment would swap the
Mapfor a shared store (e.g. Redis), matching the note already onNotificationRateLimiter.Closes #825
Closes #820
Closes #822
Closes #823