Phase P4 – First Application Prototype

Description
This phase presents a working prototype application that demonstrates
how selected application scenarios from Phase P3 can be implemented
using a real database and backend logic.

Technology
- Programming language: Python
- Framework: Flask
- Database: SQLite
- Execution environment: Local development (Windows)

Implemented Scenarios
The prototype implements a representative subset of the application
scenarios defined in Phase P3:

1. Listing weddings for a user
2. Viewing events for a selected wedding
3. Viewing guests for a wedding
4. Attendance overview for an event
5. RSVP overview for an event
6. Venue availability check with conflict detection

Venue Availability Logic
The application implements business logic to detect overlapping
venue bookings for a selected date and time interval.

If a conflict exists, the system returns:
- available: false
- list of conflicting bookings

If no conflict exists, the system returns:
- available: true

Screenshots
Below are screenshots demonstrating:
- Wedding listing
- Attendance overview
- RSVP overview
- Venue availability with conflict
- Venue availability without conflict

This prototype demonstrates the feasibility of implementing
the database usage scenarios and validates the database design.