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.github/instructions/octofit_tracker_django_backend.instructions.md

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+---
+applyTo: "octofit-tracker/backend/**"
+---
+# Octofit Tracker Logic + Data Tier Guidelines
+
+## Logic tier (Node.js + Express + TypeScript)
+
+- Build API routes under `/api/`.
+- Keep API service on port `8000`.
+- Use environment-aware Codespaces URLs via `CODESPACE_NAME`.
+
+Example base URL logic:
+
+```ts
+const codespaceName = process.env.CODESPACE_NAME;
+const baseUrl = codespaceName
+  ? `https://${codespaceName}-8000.app.github.dev`
+  : 'http://localhost:8000';
+```
+
+## Data tier (MongoDB + Mongoose)
+
+- Use Mongoose models for users, teams, activities, leaderboard, and workouts.
+- Connect to `octofit_db`.
+- Validate endpoints with `curl` after wiring routes.