The database for the project is decidedly a NoSQL database: Firebase. As such, traditional ERDs don't apply the same as they would for a strictly structured database.
Consider this article which speaks to diagramming NoSQL databases.
Create the conceptual data model for the database as per required project deliverables:
[x] Create a diagram for application accounts (including how administration is handled)
[x] Create a diagram for posts and threads (including how authorization is handled)
The database for the project is decidedly a NoSQL database: Firebase. As such, traditional ERDs don't apply the same as they would for a strictly structured database.
Consider this article which speaks to diagramming NoSQL databases.
Create the conceptual data model for the database as per required project deliverables: