feat(core): config, job queue, range media serving, feature composition

Adds aclRepo to @stc/db for canView.

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

packages/db/src/index.ts

@@ -5,3 +5,4 @@ export { notesRepo, type Note, type NoteInput } from "./repos/notes";
 export { attemptsRepo, type Attempt } from "./repos/attempts";
 export { libraryRepo, type Collection } from "./repos/library";
 export { jobsRepo, type JobPatch } from "./repos/jobs";
+export { aclRepo, type AclEntry } from "./repos/acl";

packages/db/src/repos/acl.ts

@@ -0,0 +1,16 @@
+import type { Db } from "../connect";
+
+export interface AclEntry { principal_type: "user" | "group"; principal_id: string }
+
+export function aclRepo(db: Db) {
+  return {
+    async listForCourse(courseId: string): Promise<AclEntry[]> {
+      const rows = await db.sql`SELECT principal_type, principal_id FROM course_acl WHERE course_id = ${courseId} ORDER BY principal_type, principal_id`;
+      return rows.map((r: AclEntry) => ({ principal_type: r.principal_type, principal_id: r.principal_id }));
+    },
+    async isAuthor(courseId: string, userId: string): Promise<boolean> {
+      const rows = await db.sql`SELECT 1 AS x FROM course_authors WHERE course_id = ${courseId} AND user_id = ${userId}`;
+      return rows.length > 0;
+    },
+  };
+}