from pydantic import BaseModel
from typing import List

class CatalogItem(BaseModel):
    id: str
    name: str
    type: str

class CatalogListResponse(BaseModel):
    catalogs: List[CatalogItem]

class SchemaItem(BaseModel):
    id: str
    name: str
    layer: str

class SchemaListResponse(BaseModel):
    schemas: List[SchemaItem]

class TableItem(BaseModel):
    table_name: str
    layer: str
    format: str

class TableListResponse(BaseModel):
    catalog: str
    schema_name: str
    tables: List[TableItem]