Frontend Repository: https://github.com/anfebladi/period-tracker-app-client

Backend service for Rhythm, a privacy-first menstrual health tracking application.
This API handles cycle data management, predictions, PDF report generation, authentication, and AI-powered health insights.

• Node.js
• Express.js
• PostgreSQL
• Neon (serverless Postgres)
• Gemini LLM API (AI health assistant)

• Temporary randomized token-based authentication
• No personally identifiable information required
• User data remains unlinked to real-world identities

• Store and manage menstrual cycle logs and symptoms
• Predict future cycle lengths using a mathematical prediction model
• Analyze historical trends

• Generate professional PDF summaries of cycle history
• Designed for sharing with OB/GYNs and healthcare providers

• Integrates Gemini LLM with tailored prompts
• Provides contextual menstrual health insights
• Answers common health-related questions