{
  "version": 1,
  "kind": "entities",
  "title": "Orders, as stored",
  "description": "A physical schema: three tables with their column types and keys. Each foreign key is drawn from its own column to the table it refers to, and deleting an order deletes its lines.",
  "entities": [
    {"id": "customers", "text": "`customers`", "fields": [
      {"id": "c_id", "text": "`id`", "type": "uuid", "key": "primary"},
      {"text": "`email`", "type": "text", "key": "unique"},
      {"text": "..."}
    ]},
    {"id": "orders", "text": "`orders`", "fields": [
      {"id": "o_id", "text": "`id`", "type": "uuid", "key": "primary"},
      {"id": "o_customer", "text": "`customer_id`", "type": "uuid", "key": "foreign"},
      {"text": "`placed_at`", "type": "timestamptz"},
      {"text": "`status`", "type": "text"}
    ]},
    {"id": "lines", "text": "`order_lines`", "fields": [
      {"id": "l_order", "text": "`order_id`", "type": "uuid", "key": "foreign"},
      {"text": "`sku`", "type": "text", "key": "foreign"},
      {"text": "`quantity`", "type": "integer"},
      {"text": "`unit_price`", "type": "numeric(10,2)"}
    ]}
  ],
  "edges": [
    {"from": "orders", "from_field": "o_customer", "to": "customers", "to_field": "c_id", "from_end": "zero-or-many", "to_end": "one"},
    {"from": "lines", "from_field": "l_order", "to": "orders", "to_field": "o_id", "from_end": "one-or-many", "to_end": "one", "label": "on delete cascade", "role": "strong"}
  ]
}