System Diagrammer, part of the SYGNAL broadcast toolkit, draws your facility's systems and cabling and keeps the schedules behind the drawings.

It installs as one app with its own database inside it (PostgreSQL 16). Nothing else needs to be installed first.

It starts now, for you, and is then used in your browser at https://localhost:8050, or from SYGNAL toolbox. It doesn't start at login unless you turn on Start at login in SYGNAL toolbox.

The first time, it asks you to create the first account. That page can only be reached from this Mac.

Your drawings and its database are kept in ~/Library/Application Support/System Diagrammer. Installing again, or updating, keeps them.