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Investigated three approaches for CH 24.12: - Inline SETTINGS on ADD PROJECTION: rejected (UNKNOWN_SETTING — not a query-level setting). - ALTER TABLE MODIFY SETTING deduplicate_merge_projection_mode='rebuild': works; persists in table metadata across connection restarts; runs before ADD PROJECTION in the SQL script. - Session-level JDBC URL param: not pursued (MODIFY SETTING is strictly better). alerting_projections.sql now runs MODIFY SETTING before the two executions ADD PROJECTIONs. AlertingProjectionsIT strengthened to assert all four projections (including alerting_app_status and alerting_route_status on executions) exist after schema init. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>