Checkpoint from VS Code for coding agent session

.github/copilot-instructions.md

@@ -0,0 +1,58 @@
+# Copilot Instructions for Bind Mount Applications
+
+## Project Overview
+This is a Docker learning project featuring a simple Todo app with Node.js/Express frontend and MongoDB backend. The codebase demonstrates containerized application development with Docker Compose.
+
+## Architecture Patterns
+
+### Service Architecture
+- **App Service**: Node.js Express server (`app/server.js`) on port 3001
+- **Database Service**: MongoDB (`todo-database`) on custom port 27018
+- **Connection**: App connects to MongoDB via service name `todo-database:27018`
+
+### Key Files & Structure
+```
+app/
+├── server.js              # Main Express server, sets up EJS and routes  
+├── config/keys.js         # Database connection config (uses service name)
+├── models/Todo.js         # Mongoose schema for todos
+├── routes/front.js        # All HTTP routes (GET /, POST /, POST /todo/destroy)
+└── views/todos.ejs        # Single EJS template with Bootstrap
+```
+
+## Development Workflows
+
+### Docker Development
+- **Start**: `docker compose up -d` (app runs on http://localhost:3001)  
+- **Development Mode**: Container uses `npm run dev` with nodemon for live reload
+- **Bind Mounts**: Commented out in `compose.yaml` - uncomment volumes for live code changes
+
+### Key Conventions
+- **Database Config**: Always use Docker service names (`todo-database:27018`), not localhost
+- **Port Mapping**: App runs on 3001 internally and externally  
+- **MongoDB Port**: Uses non-standard 27018 to avoid conflicts
+- **EJS Templates**: Moment.js available globally via `app.locals.moment`
+
+### Model Patterns
+- Single Mongoose model exports as `module.exports = Todo = mongoose.model('todos', TodoSchema)`
+- Schema uses `created_at` with `Date.now()` default
+- Routes use async/await for database operations
+
+### Route Structure
+- All routes in single file (`routes/front.js`)
+- GET `/` - fetches todos and renders EJS template
+- POST `/` - creates new todo and redirects
+- POST `/todo/destroy` - deletes todo by `_key` field
+
+## Docker Specifics
+- **Dockerfile**: Uses Node 19.5.0 Alpine with multi-stage build optimizations
+- **Dependencies**: Installed via bind mounts for caching efficiency
+- **Runtime User**: Runs as non-root `node` user
+- **Links**: Uses legacy Docker `links` for service discovery
+
+## Quick Start for AI Agents
+1. Database operations always go through Mongoose models
+2. All HTML rendering uses EJS with Bootstrap 4.3.1 and Font Awesome
+3. Form submissions are POST requests with `body-parser` URL-encoded parsing
+4. Error handling is minimal - check `server.js` and route files for patterns
+5. No authentication, testing, or API endpoints - pure server-rendered CRUD app

app/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "body-parser": "^1.20.2",
     "ejs": "^3.1.9",
-    "express": "^4.18.2",
+    "express": "^4.19.2",
     "moment": "^2.29.4",
     "mongoose": "^7.1.0",
     "nodemon": "^3.0.1"