The agent may write SQL, I run it. The additive rule is the one that saves you: a column added this week and dropped next week is two safe deploys instead of one deploy that takes the site down.
CLAUDE.md
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## Database changes
- Every schema change is a numbered file in `supabase/migrations/`, never a change made in the dashboard.
- Additive only. Add the column, backfill, switch the code, drop the old thing in a later migration. Never add and drop in one file.
- New columns are nullable or have a default. No `not null` without a default on a table that has rows.
- A new table enables row level security and gets its policies in the same file.
- Show me the SQL and stop. I run migrations, you do not.
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