# Enhancement specification (example)

## context
- existing app: TaskFlow Pro v1.3 (Next.js 14, Node.js API, Postgres 14)
- request: add task dependencies and Gantt-style timeline view

## goals
- represent finish-to-start dependencies between tasks
- show project timeline with critical path basics

## constraints
- no breaking changes to existing task API
- incremental rollout behind feature flag `task_dependencies`

## acceptance criteria
- create/read/update/delete dependencies via versioned endpoints (v2)
- timeline view loads in < 400ms P95 for 1k tasks
- migration scripts support roll-forward and rollback

## risks
- query performance on large projects → add indexes, pagination, caching
- UI complexity → progressive disclosure and virtualization