A SaaS with a Real PostgreSQL Backend, Not a Mock

Build a client project tracker backed by a database. Store workspaces, memberships, projects, tasks and comments with explicit ownership and relationships, plus search and exports scoped to the current workspace.

Include these capabilities:
- PostgreSQL schema designed from your description — real tables, not mocks
- REST API endpoints generated alongside the UI
- Authentication with password hashing and sessions
- Plan-aware, gated dashboard with Stripe-ready billing surfaces
- Deployable app with schema.sql and full source in the export

Build the complete working project with its routes, data model and interactions. For saved or private data, implement persistence, authentication and server-side permissions. Keep API credentials on the server. For external services, document the required setup and use test mode until real accounts are connected. Do not present a simulated integration as a completed live connection.

Make the interface responsive, with accessible labels, keyboard navigation and visible focus. Include loading, empty, validation and error states. Use clearly labelled sample data, never invented customer testimonials or results. Choose a visual direction suited to this project and keep typography, spacing and controls consistent. Explain how to run, test, export and deploy the source.

Verify this end-to-end flow:
Create related records, reload and export them. Attempt access from another workspace and verify both the screen and API enforce the same boundary.