20 lines
773 B
SQL
20 lines
773 B
SQL
-- TDesktop has no account-level differenceTooLong fallback. If any confirmed prefix has already
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-- been deleted, removing this floor/observed state would turn a durable history hole into a false
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-- empty difference. A rollback is safe only before retention has advanced anywhere.
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DO $$
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BEGIN
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IF EXISTS (
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SELECT 1
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FROM public.user_update_retention
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WHERE retained_through_pts > 0
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) THEN
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RAISE EXCEPTION
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'cannot roll back user update retention: retained floor has advanced'
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USING ERRCODE = '55000';
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END IF;
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END
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$$;
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DROP INDEX IF EXISTS public.user_update_events_retention_global_idx;
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DROP TABLE IF EXISTS public.user_update_retention;
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ALTER TABLE public.update_states DROP COLUMN IF EXISTS observed_pts;
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