diff --git a/website/src/website/switch/sync.ts b/website/src/website/switch/sync.ts
new file mode 100644
index 00000000..4e2b648c
--- /dev/null
+++ b/website/src/website/switch/sync.ts
@@ -0,0 +1,37 @@
+import { getAll, getAllByIndex, type RepoRecord, type BranchRecord, type CommitRecord, type IssueRecord } from './db';
+import { supabase } from './supabase';
+
+export interface ExportBundle {
+  repo: RepoRecord;
+  branches: BranchRecord[];
+  commits: CommitRecord[];
+  issues: IssueRecord[];
+  exportedAt: number;
+}
+
+export async function exportRepoBundle(repoId: string): Promise<ExportBundle> {
+  const repos = await getAll<RepoRecord>('repos');
+  const repo = repos.find(r=>r.id===repoId)!;
+  const branches = await getAllByIndex<BranchRecord>('branches','by_repo', repoId);
+  const commits = await getAllByIndex<CommitRecord>('commits','by_repo', repoId);
+  const issues = await getAllByIndex<IssueRecord>('issues','by_repo', repoId);
+  return { repo, branches, commits, issues, exportedAt: Date.now() };
+}
+
+export async function pushRepoToSupabase(repoId: string): Promise<void> {
+  if (!supabase) throw new Error('Supabase not configured');
+  const bundle = await exportRepoBundle(repoId);
+  const path = `repos/${repoId}.json`;
+  const data = new Blob([JSON.stringify(bundle)], { type: 'application/json' });
+  const { error } = await supabase.storage.from('switch').upload(path, data, { upsert: true });
+  if (error) throw error;
+}
+
+export async function pullRepoFromSupabase(repoId: string): Promise<ExportBundle | undefined> {
+  if (!supabase) throw new Error('Supabase not configured');
+  const path = `repos/${repoId}.json`;
+  const { data, error } = await supabase.storage.from('switch').download(path);
+  if (error) throw error;
+  const text = await data.text();
+  return JSON.parse(text) as ExportBundle;
+}