[Fall 26] Juno Onboarding Ticket

This is a dummy ticket intended to help new developers of Juno get more accustomed to its codebase structure.

You will be creating a new feature-flag module in the db-service, and in the process learning the docker setup, prisma migrations, protobuf integration, and our end-to-end testing.

Please implement this yourself end to end. Prior-semester onboarding PRs for other modules exist on GitHub — don’t copy them.

Homework Reading

• Protobuf, and using them via gRPC
• Nest.js microservices (the docs will save a lot of headache)
• Juno README
• Juno SDK README
• Juno Dashboard README
• Infra Notion page

Requirements & Criteria

• Follow the README to set up Juno and successfully run the api-gateway e2e tests
• Create a prisma model FeatureFlag with id (string), enabled (boolean, default false), and optional description (string)
• Create feature_flag.proto with: createFlag, getFlag, setFlag, deleteFlag (+ matching request/response types)
• Create a feature-flag module in db-service (mirror existing modules)
• Implement the four methods in db-service using prisma + your proto defs
• Create a feature-flag module in api-gateway that calls db-service

Testing

• feature-flag.e2e-spec.ts in db-service — ≥1 test per method
• feature-flag.e2e-spec.ts in api-gateway — ≥1 test per method (gateway path)

Additional Non-Code Requirements

• Run Juno locally
• Run Juno Dashboard locally
• Add your profile to Infra Notion

Deliverable

One PR per developer. Title: [Fall 26] Onboarding Ticket - <Your Name>.