Q150: work can be sent back, reopened, moved to backlog, or blocked with a reason

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

src/main/database/migrations/101-task-blocked.ts

@@ -0,0 +1,7 @@
+// Why the operator blocked a task; while set, no session starts on it.
+export const taskBlockedSchema = `
+  alter table tasks add column blocked_reason text;
+
+  insert into schema_migrations(version, name, applied_at)
+  values (101, 'task_blocked', datetime('now'));
+`;

src/main/database/schema.ts

@@ -99,6 +99,7 @@ import { dropDrillOnlySloSchema } from "./migrations/097-drop-drill-only-slo";
 import { dropAuditReplaysSchema } from "./migrations/098-drop-audit-replays";
 import { dropRollbackRecordsSchema } from "./migrations/099-drop-rollback-records";
 import { chatReplyRequestsSchema } from "./migrations/100-chat-reply-requests";
+import { taskBlockedSchema } from "./migrations/101-task-blocked";
 
 interface Migration {
   version: number;
@@ -207,6 +208,7 @@ const MIGRATIONS: Migration[] = [
   { version: 98, name: "drop_audit_replays", sql: dropAuditReplaysSchema },
   { version: 99, name: "drop_rollback_records", sql: dropRollbackRecordsSchema },
   { version: 100, name: "chat_reply_requests", sql: chatReplyRequestsSchema },
+  { version: 101, name: "task_blocked", sql: taskBlockedSchema },
 ];
 
 const SCHEMA_VERSION = MIGRATIONS[MIGRATIONS.length - 1].version;