{
  "tables": [
    {
      "id": 0,
      "name": "users",
      "schema": "public",
      "comment": "User accounts",
      "color": "#3b82f6",
      "x": 100,
      "y": 100,
      "fields": [
        {
          "id": 0,
          "name": "id",
          "type": "bigint",
          "primary": true,
          "notNull": true,
          "increment": true
        },
        {
          "id": 1,
          "name": "email",
          "type": "varchar(255)",
          "unique": true,
          "notNull": true
        },
        {
          "id": 2,
          "name": "username",
          "type": "varchar(50)",
          "notNull": true
        },
        {
          "id": 3,
          "name": "created_at",
          "type": "timestamp",
          "notNull": true,
          "default": "CURRENT_TIMESTAMP"
        }
      ],
      "indexes": [
        {
          "id": 0,
          "name": "idx_users_email",
          "unique": true,
          "fields": [1]
        }
      ]
    },
    {
      "id": 1,
      "name": "posts",
      "schema": "public",
      "comment": "Blog posts",
      "color": "#10b981",
      "x": 400,
      "y": 100,
      "fields": [
        {
          "id": 0,
          "name": "id",
          "type": "bigint",
          "primary": true,
          "notNull": true,
          "increment": true
        },
        {
          "id": 1,
          "name": "user_id",
          "type": "bigint",
          "notNull": true
        },
        {
          "id": 2,
          "name": "title",
          "type": "varchar(200)",
          "notNull": true
        },
        {
          "id": 3,
          "name": "content",
          "type": "text"
        },
        {
          "id": 4,
          "name": "published",
          "type": "boolean",
          "default": "false"
        }
      ],
      "indexes": [
        {
          "id": 0,
          "name": "idx_posts_user_id",
          "unique": false,
          "fields": [1]
        }
      ]
    },
    {
      "id": 2,
      "name": "comments",
      "schema": "public",
      "color": "#f59e0b",
      "x": 700,
      "y": 100,
      "fields": [
        {
          "id": 0,
          "name": "id",
          "type": "bigint",
          "primary": true,
          "notNull": true,
          "increment": true
        },
        {
          "id": 1,
          "name": "post_id",
          "type": "bigint",
          "notNull": true
        },
        {
          "id": 2,
          "name": "user_id",
          "type": "bigint",
          "notNull": true
        },
        {
          "id": 3,
          "name": "content",
          "type": "text",
          "notNull": true
        }
      ]
    }
  ],
  "relationships": [
    {
      "id": 0,
      "name": "fk_posts_user",
      "startTableId": 1,
      "endTableId": 0,
      "startFieldId": 1,
      "endFieldId": 0,
      "cardinality": "Many to one",
      "updateConstraint": "CASCADE",
      "deleteConstraint": "CASCADE"
    },
    {
      "id": 1,
      "name": "fk_comments_post",
      "startTableId": 2,
      "endTableId": 1,
      "startFieldId": 1,
      "endFieldId": 0,
      "cardinality": "Many to one",
      "deleteConstraint": "CASCADE"
    },
    {
      "id": 2,
      "name": "fk_comments_user",
      "startTableId": 2,
      "endTableId": 0,
      "startFieldId": 2,
      "endFieldId": 0,
      "cardinality": "Many to one",
      "deleteConstraint": "SET NULL"
    }
  ],
  "notes": [
    {
      "id": 0,
      "content": "Database: test_db",
      "color": "#fbbf24",
      "x": 100,
      "y": 400
    }
  ]
}