28 lines
957 B
SQL
28 lines
957 B
SQL
-- +goose Up
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-- +goose StatementBegin
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ALTER TABLE media_assets
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ADD COLUMN IF NOT EXISTS variant varchar(32) NOT NULL DEFAULT 'main';
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-- 回填历史数据：老数据一律视为 main。
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UPDATE media_assets
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SET variant = 'main'
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WHERE variant IS NULL OR variant = '';
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-- 约束：只允许 main/preview
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ALTER TABLE media_assets
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ADD CONSTRAINT IF NOT EXISTS ck_media_assets_variant
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CHECK (variant IN ('main', 'preview'));
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COMMENT ON COLUMN media_assets.variant IS '产物类型：main/preview；用于强制试看资源必须绑定独立产物，避免用正片绕过';
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CREATE INDEX IF NOT EXISTS ix_media_assets_tenant_variant ON media_assets (tenant_id, variant);
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-- +goose StatementEnd
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-- +goose Down
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-- +goose StatementBegin
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DROP INDEX IF EXISTS ix_media_assets_tenant_variant;
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ALTER TABLE media_assets DROP CONSTRAINT IF EXISTS ck_media_assets_variant;
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ALTER TABLE media_assets DROP COLUMN IF EXISTS variant;
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-- +goose StatementEnd
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