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.github/steps/3-django-project-setup.md

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+## Step 3: Build the logic and data tiers for the multi-tier application
+
+> [!NOTE]
+> **Behind the scenes:** Custom instructions and prompt files guide Copilot while building the logic and data tiers.
+
+In this step, you will implement the backend of the **multi-tier application**:
+
+- Configure MongoDB connection for `octofit_db`.
+- Create Express routes for users, teams, activities, leaderboard, and workouts.
+- Add a seed script to populate test data.
+
+### :keyboard: Activity: Scaffold the logic tier
+
+Use this prompt file:
+
+> ![Static Badge](https://img.shields.io/badge/-Prompt-text?style=flat-square&logo=github%20copilot&labelColor=512a97&color=ecd8ff)
+>
+> ```prompt
+> /create-express-logic-tier
+> ```
+
+### :keyboard: Activity: Configure and seed the data tier
+
+Use this prompt file:
+
+> ![Static Badge](https://img.shields.io/badge/-Prompt-text?style=flat-square&logo=github%20copilot&labelColor=512a97&color=ecd8ff)
+>
+> ```prompt
+> /init-populate-octofit_db
+> ```
+
+1. Commit and push your backend changes.
+
+1. Wait for Mona to validate and unlock the next step.
+
+<details>
+<summary>Having trouble? 🤷</summary><br/>
+
+Confirm these files include expected content:
+
+- `octofit-tracker/backend/src/config/database.ts` includes `octofit_db` and `mongoose`.
+- `octofit-tracker/backend/src/scripts/seed.ts` includes a seed command description.
+
+</details>