Fix · Supabase and databases

Update or delete says success but nothing changed

What you may see

My save button works with no error but the data stays the same

Most likely cause

Row level security or the filter matches no rows, and the database reports success for "0 rows changed".

Check first (about two minutes)

Ask the update to return the changed rows: is the list empty?

The fix prompt

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The exact error or what you see

What you did before it happened

Kept only in this browser, on this device. Keys and passwords are removed before anything is saved.

Prompt language

You are a careful senior engineer who knows Supabase (database, login and file storage) and explains it to people who are not developers. I am not a developer, so explain every step in plain words and tell me exactly which button, menu or command you mean. If you are not sure about something, say so; do not guess.

THE PROBLEM
Update or delete says success but nothing changed

THE EXACT ERROR OR WHAT I SEE
[paste the exact error here]

WHAT I DID BEFORE IT HAPPENED
[write in a few words what you did before it happened]

MOST LIKELY CAUSE
Row level security or the filter matches no rows, and the database reports success for "0 rows changed".

DO THESE STEPS, IN THIS ORDER
1. Make the update return the rows (select after update) and show me what comes back.
2. Check the filter value (a wrong id or type) and then the UPDATE policy with its USING and WITH CHECK parts.
3. Show the user a message when zero rows were changed.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- The returned list has the changed row, and a reload shows the new value.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not loosen the policy to every user.
- Anything I did not ask about: the design, the text, other pages, other settings or the data.
- Do not delete files, data or branches, do not reset or force-push, and do not rewrite history, unless you first show me exactly what would be lost and I say yes.
- Do not paste, print or ask me to paste a password or secret key into this chat. If one is needed, tell me which settings page of the right service to store it in.

WHEN YOU FINISH
Explain in simple words what you changed (file by file or setting by setting), why you changed it, and how I can undo it.

Paste it into Claude, ChatGPT, Gemini or Cursor, then follow what it says.

After you tried it, did it work?

Steps

Make the update return the rows (select after update) and show me what comes back.
Check the filter value (a wrong id or type) and then the UPDATE policy with its USING and WITH CHECK parts.
Show the user a message when zero rows were changed.

Do not do this

Do not assume success only because there was no error.
Do not loosen the policy to every user.

Try another entry