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internal/database/migrations/0003_dashboard_immutability.sql

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+CREATE OR REPLACE FUNCTION prevent_dashboard_version_mutation() RETURNS trigger AS $$
+BEGIN
+    RAISE EXCEPTION 'dashboard versions are immutable';
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE TRIGGER dashboard_versions_immutable_update
+    BEFORE UPDATE ON dashboard_versions
+    FOR EACH ROW EXECUTE FUNCTION prevent_dashboard_version_mutation();
+
+CREATE INDEX IF NOT EXISTS dashboard_versions_created_at_idx ON dashboard_versions (dashboard_id, created_at DESC, version_number DESC);