feat(database): TaskQueue concurrencyVersion and role columns

concurrencyVersion records how a queue's concurrency was declared (V1 =
legacy contextual concurrencyLimit, V2 = the explicit perKey/total
shape) so display never has to guess what a stored number meant. role
distinguishes real queues from the rows that back named concurrency
limits, which every queue-facing surface filters out. Defaults cover
all existing rows with no backfill.

Author: matt-aitken

internal-packages/database/prisma/migrations/20260906140000_add_task_queue_concurrency_version_and_role/migration.sql

@@ -0,0 +1,9 @@
+-- CreateEnum
+CREATE TYPE "TaskQueueConcurrencyVersion" AS ENUM ('V1', 'V2');
+
+-- CreateEnum
+CREATE TYPE "TaskQueueRole" AS ENUM ('QUEUE', 'LIMIT');
+
+-- AlterTable
+ALTER TABLE "TaskQueue" ADD COLUMN "concurrencyVersion" "TaskQueueConcurrencyVersion" NOT NULL DEFAULT 'V1',
+ADD COLUMN "role" "TaskQueueRole" NOT NULL DEFAULT 'QUEUE';

internal-packages/database/prisma/schema.prisma

@@ -1963,6 +1963,13 @@ model TaskQueue {
   version       TaskQueueVersion @default(V1)
   orderableName String?
 
+  /// How the queue's concurrency was declared: V1 = legacy concurrencyLimit semantics
+  /// (per key when keyed, whole queue otherwise), V2 = the explicit perKey/total shape.
+  concurrencyVersion TaskQueueConcurrencyVersion @default(V1)
+  /// QUEUE rows are real queues; LIMIT rows back named concurrency limits and are
+  /// excluded from every queue-facing surface.
+  role               TaskQueueRole               @default(QUEUE)
+
   project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade, onUpdate: Cascade)
   projectId String
 
@@ -2016,6 +2023,16 @@ enum TaskQueueVersion {
   V2
 }
 
+enum TaskQueueConcurrencyVersion {
+  V1
+  V2
+}
+
+enum TaskQueueRole {
+  QUEUE
+  LIMIT
+}
+
 model BatchTaskRun {
   id                      String             @id @default(cuid())
   friendlyId              String             @unique