I am in the process of creating a back-end interface for multiple micro-controllers to communicate data to each other. When one sends a request, it creates a group. The others are notified and can join the group as well. What would be the best architecture for the database? It needs to keep track of when each group was created, how many micro-controllers joined and when it ended.
For this use case, a relational database would be a good choice as it can easily store and retrieve structured data. Here is a possible database schema:

Table: Group

    id (primary key)
    created_at
    ended_at

Table: Microcontroller

    id (primary key)
    group_id (foreign key to Group)
    joined_at

In this schema, each group is represented as a row in the Group table with a unique ID, the time it was created, and the time it ended (if applicable). When a microcontroller joins a group, a row is added to the Microcontroller table with its own unique ID and a foreign key reference to the group it joined. The joined_at column records the time when the microcontroller joined the group.

To query the number of microcontrollers that joined a particular group and when they joined, you can use a JOIN statement between the Group and Microcontroller tables. For example:


SELECT Microcontroller.id, Microcontroller.joined_at
FROM Group
JOIN Microcontroller ON Group.id = Microcontroller.group_id
WHERE Group.id = [group ID];

This will return a list of microcontroller IDs and their join times for the specified group ID.
Can you provide an example of how you would implement a notification system to inform micro-controllers when a new group has been created and how they can join it?