Show HN: DryRun – PostgreSQL MCP and schema advisor that works offlinegithub.com/boringSQL 2 pointsradimm5 months ago1 commentSaveHideCopy link On HNComments−radimmOP5moOne of the benefit is that instead of LLM blindly advising you to doALTER TABLE customers ALTER COLUMN email SET NOT NULL;it can advise you to-- Step 1: backfill NULLs UPDATE customers SET email = 'unknown-' || id || '@example.com' WHERE email IS NULL;-- Step 2: add constraint without full table scan ALTER TABLE customers ADD CONSTRAINT customers_email_not_null CHECK (email IS NOT NULL) NOT VALID;-- Step 3: validate in the background with a weaker lock ALTER TABLE customers VALIDATE CONSTRAINT customers_email_not_null;
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One of the benefit is that instead of LLM blindly advising you to do
it can advise you to
-- Step 1: backfill NULLs UPDATE customers SET email = 'unknown-' || id || '@example.com' WHERE email IS NULL;
-- Step 2: add constraint without full table scan ALTER TABLE customers ADD CONSTRAINT customers_email_not_null CHECK (email IS NOT NULL) NOT VALID;
-- Step 3: validate in the background with a weaker lock ALTER TABLE customers VALIDATE CONSTRAINT customers_email_not_null;