"rate-limiting"

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Translation System Evolution Chronicle: From DeepSeek Migration to 429 Rate Limiting, Speed Optimization, and Detection Enhancement

This article documents the ongoing operational challenges of the blog translation system after the Provider migration, covering DeepSeek speed optimization, 429 rate limiting handling, category/tag translation detection fixes, and the complete implementation of admin backend translation enhancement features.

Interface Management

OTP & SMS Verification System — Pepper Hashing + DB Rate Limiting + State Machine + Replay Attack Protection

In-depth analysis of the NestJS OTP verification system: SmsVerificationCode model with 17-field state machine design, SHA-256 Pepper hashing for leak prevention, 60s DB rate limiting + 5-attempt lockout, concurrent safe updates, Throttler dual protection, and production/development dual modes.

Management Backend