• Head over to the Supabase website and log in.
• Start a new project, or pick one you already have.
• Jot down the project’s URL and API key from the settings. You’ll need these later.

• Go to the "SQL Editor" in your Supabase dashboard.
• Run this SQL script to set up an audit logs table:

CREATE TABLE audit_logs (
    id SERIAL PRIMARY KEY,
    table_name TEXT NOT NULL,
    operation TEXT NOT NULL,
    timestamp TIMESTAMP DEFAULT NOW(),
    old_values JSONB,
    new_values JSONB,
    performed_by UUID
);

• Use the SQL Editor to create triggers that log changes in the tables you care about.
• Here’s an example script to log INSERT, UPDATE, and DELETE actions on a users table:

CREATE OR REPLACE FUNCTION log_user_changes()
RETURNS TRIGGER AS $$
BEGIN
    IF (TG_OP = 'INSERT') THEN
        INSERT INTO audit_logs (table_name, operation, new_values, performed_by)
        VALUES ('users', 'INSERT', row_to_json(NEW), NEW.user_id);
        RETURN NEW;
    ELSIF (TG_OP = 'UPDATE') THEN
        INSERT INTO audit_logs (table_name, operation, old_values, new_values, performed_by)
        VALUES ('users', 'UPDATE', row_to_json(OLD), row_to_json(NEW), NEW.user_id);
        RETURN NEW;
    ELSIF (TG_OP = 'DELETE') THEN
        INSERT INTO audit_logs (table_name, operation, old_values, performed_by)
        VALUES ('users', 'DELETE', row_to_json(OLD), OLD.user_id);
        RETURN OLD;
    END IF;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER trigger_user_changes
AFTER INSERT OR UPDATE OR DELETE ON users
FOR EACH ROW EXECUTE PROCEDURE log_user_changes();

• Ensure the audit_logs table is secure and only accessible by authorized users.
• In the "Auth" section of the Supabase dashboard, set up the necessary policies.
• Here’s an example policy to restrict access to the audit_logs table to only users with Admin privileges:

CREATE POLICY admin_access_to_audit_logs
ON audit_logs
FOR SELECT
USING ( auth.role() = 'admin' );

• Try some insert, update, and delete operations on the users table.
• Check the audit_logs table to make sure entries are being logged correctly:

SELECT * FROM audit_logs ORDER BY timestamp DESC;

• Regularly review and back up the contents of the audit_logs table.
• Think about setting up archival or purging strategies to manage the table size over time.
• Use Supabase's monitoring tools to keep an eye on the performance and integrity of the auditing process.