backend_design.txt

Python Flask server with the following components:

1. Database:
   - Use SQLite for simplicity
   - Tables:
     - Orders: id, customer_id, status, created_at, updated_at
     - DeliveryEvents: id, order_id, event_type, timestamp, driver_id, region
     - Drivers: id, name, contact_info
     - Regions: id, name

2. API Endpoints:
   - GET /api/orders
     - Query parameters: customer_id, status, date_range
     - Returns list of orders with basic info
   
   - GET /api/orders/<order_id>
     - Returns detailed order info including delivery events
   
   - GET /api/delivery_events
     - Query parameters: order_id, driver_id, region, date_range
     - Returns list of delivery events
   
   - POST /api/delivery_events
     - Create new delivery event
   
   - PUT /api/orders/<order_id>
     - Update order status

3. Search functionality:
   - Implement full-text search on orders and delivery events
   - Use SQLite FTS5 extension for efficient searching

4. Authentication:
   - Simple username/password authentication for customer support team
   - Use Flask-Login for session management

5. Logging:
   - Implement logging for all API requests and database operations

Pseudocode for main app structure:

```python
from flask import Flask, request, jsonify
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager

app = Flask(__name__)
db = SQLAlchemy(app)
login_manager = LoginManager(app)

# Define database models (Orders, DeliveryEvents, Drivers, Regions)

@app.route('/api/orders', methods=['GET'])
def get_orders():
    # Implement order search and filtering
    pass

@app.route('/api/orders/<order_id>', methods=['GET'])
def get_order_details(order_id):
    # Retrieve and return order details with delivery events
    pass

@app.route('/api/delivery_events', methods=['GET', 'POST'])
def handle_delivery_events():
    # Implement delivery event search and creation
    pass

@app.route('/api/orders/<order_id>', methods=['PUT'])
def update_order_status(order_id):
    # Update order status
    pass

if __name__ == '__main__':
    app.run(debug=True)
```