7c0e94a425
Adds alerting_projections.sql with four projections (alerting_app_status, alerting_route_status on executions; alerting_app_level on logs; alerting_instance_metric on agent_metrics). ClickHouseSchemaInitializer now runs both init.sql and alerting_projections.sql, with ADD PROJECTION and MATERIALIZE treated as non-fatal — executions (ReplacingMergeTree) requires deduplicate_merge_projection_mode=rebuild which is unavailable via JDBC pool. MergeTree projections (logs, agent_metrics) always succeed and are asserted in IT. Column names confirmed from init.sql: logs uses 'application' (not application_id), agent_metrics uses 'collected_at' (not timestamp). All column names match the plan. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>