-- Migration: Add sub-model support for intelligent model selection
-- Date: 2025-12-09
-- Purpose: Support hierarchical model structure for Volcano Video service

-- Add sub-model related fields to AiModel table
ALTER TABLE "AiModel" 
ADD COLUMN IF NOT EXISTS "is_sub_model" BOOLEAN NOT NULL DEFAULT false,
ADD COLUMN IF NOT EXISTS "parent_model_id" UUID;

-- Add comments for clarity
COMMENT ON COLUMN "AiModel"."is_sub_model" IS '是否为子模型（不在前端模型列表中显示）';
COMMENT ON COLUMN "AiModel"."parent_model_id" IS '父模型ID（如果is_sub_model=true）';

-- Create index for efficient sub-model queries
CREATE INDEX IF NOT EXISTS "idx_aimodel_sub_model" 
ON "AiModel"("parent_model_id", "is_sub_model")
WHERE "is_sub_model" = true;

-- Create index for efficient parent model queries
CREATE INDEX IF NOT EXISTS "idx_aimodel_parent_model" 
ON "AiModel"("id", "is_sub_model")
WHERE "is_sub_model" = false;