Supabase clarifies common RLS policy error 42501 and solutions.

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A developer on DEV Community detailed the specific '42501' error in Supabase, which indicates an insufficient privilege violation. The error commonly occurs when a new database row conflicts with existing Row-Level Security (RLS) policies. The article explains that this can happen during insert or upsert operations if the correct policies for the specific operation are not defined. It provides tested solutions, such as creating appropriate INSERT or SELECT policies tailored to the user's authentication status. The guide is based on tests using Supabase's local development stack with specific library versions.

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