# `data.store_unknown`

Entity's store is not a database connection.

Area 5, [Data](../topics/data.md); not declinable; the next step is usually the agent's.

```jadpo
entity Note {
    id: Uuid

    store: archive
}
```

```text
error: `archive` isn't a database `Note` can live in
 --> domains/notes/entities/note.jadpo:4:12
  |
4 |     store: archive
  |            ^^^^^^^ not a database
  reason: `app.jadpo` declares no connection called `archive`; an entity's `store:` names a connection with `driver: Driver.postgres`, or `main` when `app.jadpo` declares no database.
  next: Name a database connection, or declare one in `app.jadpo` (agent)
  rule: data.store_unknown
  help: https://jadpo.dev/docs/errors/data.store_unknown

check failed: 1 error, 2 files
```