Admin can view monthly appointment statistics

[jonadavrivera]

User Story

Title:
As an admin, I want to run a MySQL stored procedure that returns the number of appointments per month, so that I can track platform usage.

Acceptance Criteria:

1. A stored procedure exists in MySQL.
2. The procedure groups appointments by month.
3. The result includes the month and total appointment count.
4. Months without appointments are handled correctly.
5. The procedure can be executed from the MySQL command line.

Priority: Medium

Story Points: 5

Notes:

• The query should use the appointment date.
• Results should be ordered chronologically.