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+Admin Guide
+===========
+
+Admin endpoints are gated by `RequireAdmin` middleware (checks `users.is_admin`). The admin panel is opened via the "Admin" button in the SPA header (shown only when the current user is an admin).
+
+### Bootstrap
+
+On first visit (no users exist), you are redirected to `/bootstrap.html` to create the initial admin account.
+
+### Creating Users
+
+1. Open the admin panel.
+2. Enter username, password, and check "Is admin" if desired.
+3. Submit — the frontend calls `POST /api/admin/users`.
+4. Admins cannot delete themselves via `DELETE /api/admin/users/:id`.
+
+### Managing Set Permissions
+
+- `GET /api/admin/permissions` — list permissions matrix
+- `POST /api/admin/permissions` — grant access to a set (`body: { set_id, user_id, role: "owner" | "viewer" }`)
+- `DELETE /api/admin/permissions` — revoke access (`body: { set_id, user_id }`)
+
+Roles:
+- `owner` — can upload to the set, soft-delete / restore media, regenerate thumbnails
+- `viewer` — can browse and play media in the set
+
+Admins implicitly see all sets without explicit permission rows.
+
+### Rescanning the Library
+
+Click **Rescan** in the admin panel, or call:
+
+```bash
+curl -X POST -b session=<cookie> http://<host>/api/admin/rescan
+```
+
+This triggers `FSScanner.Scan()`, which:
+1. Scans immediate subdirectories of `MEDIA_ROOT` as **sets**
+2. Recursively walks each set for supported media files
+3. Probes new files with `ffprobe`
+4. Generates thumbnails for video files
+5. Inserts new records into the `media` table
+
+### Managing Trash
+
+- `GET /api/admin/trash` — list soft-deleted media
+- `DELETE /api/media/{id}` — soft-delete a media item
+- `POST /api/media/{id}/restore` — restore a soft-deleted item
+
+Soft-deleted media remains on disk until garbage collection removes it (see `GC_INTERVAL_MINUTES`).
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