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Supabase RLS Blocking Inserts? Fix the Policy, Not the Security Boundary

QUICK ANSWER

A Row Level Security failure means the database policy and the user's authenticated row context do not agree. Verify authentication, table RLS state, INSERT policy WITH CHECK expression, ownership columns, and credential boundaries rather than disabling RLS.

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Common symptoms

Insert works in SQL editor but not the app
Authenticated user gets a row-level security error
Data saves with service role but not the normal client
Profile creation fails after signup

Possible causes

No INSERT policy exists
WITH CHECK does not match the new row
User or tenant ID is missing
Service-role behavior masked a client policy failure

HOW TO FIX IT

Work from the safest step to the harder repair.

Step 1. Reproduce as the same authenticated role used by the application.
Step 2. Confirm RLS is enabled and inspect policies for the exact table and operation.
Step 3. Verify the app writes the ownership or tenant field expected by the INSERT policy.
Step 4. Check the WITH CHECK expression against the inserted row.
Step 5. Keep service-role credentials on trusted backend code only.
Step 6. Add tests for two users or tenants so the repair cannot cross data boundaries.

Need the actual code? Go to GenesisCodeDoctor.com to search the Code Store or request code for the exact platform, error, and repair you are working on.

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BEFORE YOU PASTE CODE

Protect the working site first.

Test allowed and forbidden access.
Keep tenant identifiers validated.
Review SELECT, UPDATE and DELETE policies after changes.

STOP AND GET HELP WHEN

Do not turn a repair into a larger outage.

Do not disable RLS as a production fix.
Do not expose the service-role key to the browser.
Do not broaden a policy to all rows merely to clear an error.

HOW GENESIS HANDLES IT

Diagnose the exact failure before choosing a repair.

Genesis separates the visible symptom from the underlying technical cause. Run the supported diagnostic first, review the evidence, and then use a matching repair only when the failure is actually verified.

Platform scope: Supabase · PostgreSQL · AI-built SaaS
Category: Database security · Production failures
Last updated: 2026-09-24

REPAIR PROFILE

Know the complexity before you edit.

Difficulty: Intermediate
Change risk: High

These labels describe implementation complexity and blast radius, not a guaranteed repair time.

AUTHORITATIVE SOURCES

Verify time-sensitive platform details at the source.

Supabase Docs — Row Level Security

Next step

Start with a free diagnostic. If Genesis verifies a problem and a compatible treatment exists, continue to the matching Code Store product or repair path. If you cannot find the exact code you need, request it at GenesisCodeDoctor.com rather than forcing a generic snippet into the wrong platform.

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