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Columns such as user_id and tenant_id are common PostgreSQL index candidates because they often drive ownership filters, RLS policies, joins and tenant-scoped queries. Learn when an index is justified, when a composite index is better, and how to verify the result with EXPLAIN.

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Enabling Row Level Security without defining policies does not leave a PostgreSQL table open. It creates a default-deny state for normal access — and in Supabase that often looks like missing data or failed application operations.

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