How to use the Data model (ERD) template

Start a board from it
Use this template opens a new Freero board with the Data model (ERD) template on it (sign up free first). On a board you already have, open Templates in the toolbar and search for “Data model (ERD)”.
Follow the instruction on the board
“One box per table, primary (PK) and foreign (FK) keys first. Read each line’s ends as “how many on this side”.”
Fill in each part
- customer PK id email name created_at
- order PK id FK customer_id placed_at status
- payment PK id FK order_id amount paid_at
- address PK id FK customer_id street city postcode
- order_line PK id FK order_id FK product_id quantity unit_price
- product PK id FK category_id name price
- category PK id name
- Reading the ends
Bring your team and your agents
Invite people to the board or share a link, and work on it together live. The timer is in the top bar, private mode and voting in the board menu, and Claude or ChatGPT can join through Freero’s MCP server.

Work on it with an AI agent

Connect an assistant once and it works on the board with you, with your permissions: by default it reads and proposes, and people decide.

You ask: “Fill in the Data model (ERD) board from these notes.”
What happens It reads the board, then proposes sticky notes for it. Nothing changes until someone on the board accepts them.
You ask: “Group what we wrote into themes and list the actions.”
What happens It proposes clusters with a title each and task cards for the actions, labelled with its name and yours.

Data dictionary
Describe the fields in an important table in plain words: what each holds, where it comes from, its allowed values and its pitfalls.
Sequence diagram
A sign-in flow as UML lifelines, activation bars, calls, replies and an alt fragment.
System architecture
Users, apps, services, data stores and outside providers, with what talks to what.
CI/CD pipeline
From pull request to production across four lanes, with BPMN events, tasks and gateways.
System context sketch
The big picture of one system: who uses it, which other systems it talks to, and what flows between them.
Domain events workshop
Map a business process as the events that happen in it, with the commands, people and rules around each one.