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POST /api/auth/login receives JSON credentials. Request validation middleware checks for required fields (email, password). Rate limiting applied: 5 attempts per IP per minute.
Credentials forwarded to AuthService.authenticate(). Method retrieves user by email, uses password_verify() with BCrypt cost factor 12. Returns JWT token on success with 15-minute expiry.
Uses sodium_crypto_pwhash_str() for Argon2ID hashing with memory cost of 64MB and time cost of 3 iterations. Pepper stored in AWS Secrets Manager, rotated every 90 days.
PostgreSQL with prepared statements. Users table indexed on email (B-tree). Connection pooling via PgBouncer with max 50 connections. Audit logs written to user_events table.