Q134: a signal's category comes from its runtime source, so self-checks cannot pass as real traffic

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/database/migrations/097-drop-drill-only-slo.ts

@@ -0,0 +1,7 @@
+// The browser-session SLO was fed only by the removed chaos drill, so no runtime signal could ever meet or miss it.
+export const dropDrillOnlySloSchema = `
+  delete from slo_targets where signal_key = 'browser_session_boundary';
+
+  insert into schema_migrations(version, name, applied_at)
+  values (97, 'drop_drill_only_slo', datetime('now'));
+`;

src/main/database/schema.ts

@@ -95,6 +95,7 @@ import { taskEnqueueErrorSchema } from "./migrations/093-task-enqueue-error";
 import { dropConfigCountEvalsSchema } from "./migrations/094-drop-config-count-evals";
 import { dropPrBotGatesSchema } from "./migrations/095-drop-pr-bot-gates";
 import { dropChaosDrillsSchema } from "./migrations/096-drop-chaos-drills";
+import { dropDrillOnlySloSchema } from "./migrations/097-drop-drill-only-slo";
 
 interface Migration {
   version: number;
@@ -199,6 +200,7 @@ const MIGRATIONS: Migration[] = [
   { version: 94, name: "drop_config_count_evals", sql: dropConfigCountEvalsSchema },
   { version: 95, name: "drop_pr_bot_gates", sql: dropPrBotGatesSchema },
   { version: 96, name: "drop_chaos_drills", sql: dropChaosDrillsSchema },
+  { version: 97, name: "drop_drill_only_slo", sql: dropDrillOnlySloSchema },
 ];
 
 const SCHEMA_VERSION = MIGRATIONS[MIGRATIONS.length - 1].version;