fix: 减少自定义情景中数据库表对 prompt 的约束
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backend/migrations/005_fix_user_scenarios_description.up.sql
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backend/migrations/005_fix_user_scenarios_description.up.sql
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-- 005_fix_user_scenarios_description.up.sql
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-- 修复 user_scenarios 表约束:description 允许为空,prompt 最小长度改为 10
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-- 1. 允许 description 为空
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ALTER TABLE user_scenarios
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ALTER COLUMN description DROP NOT NULL;
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-- 2. 修复 prompt 长度约束(从 50 改为 10,与代码一致)
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ALTER TABLE user_scenarios
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DROP CONSTRAINT IF EXISTS check_prompt_length;
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ALTER TABLE user_scenarios
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ADD CONSTRAINT check_prompt_length CHECK (char_length(prompt) >= 10 AND char_length(prompt) <= 2000);
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COMMENT ON COLUMN user_scenarios.description IS '简短描述,可选,显示在情景卡片上(允许为空)';
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COMMENT ON COLUMN user_scenarios.prompt IS '角色 System Prompt,定义 AI 行为(10-2000 字符)';
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