Function syncTodos

examples/electron/offline-first/src/db/todos.ts:153–229

({
  transaction,
  idempotencyKey,
}: {
  transaction: { mutations: Array<PendingMutation> }
  idempotencyKey: string
})

// Sync function to push mutations to the backend
async function syncTodos({
  transaction,
  idempotencyKey,
}: {
  transaction: { mutations: Array<PendingMutation> }
  idempotencyKey: string
}) {
  const mutations = transaction.mutations

  console.log(`[Sync] Processing ${mutations.length} mutations`, idempotencyKey)

  for (const mutation of mutations) {
    try {
      switch (mutation.type) {
        case 'insert': {
          const todoData = mutation.modified as Todo
          const response = await fetchWithRetry(`${BASE_URL}/api/todos`, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/json',
              'Idempotency-Key': idempotencyKey,
            },
            body: JSON.stringify({
              id: todoData.id,
              text: todoData.text,
              completed: todoData.completed,
            }),
          })
          if (!response.ok) {
            throw new Error(`Failed to sync insert: ${response.statusText}`)
          }
          break
        }

        case 'update': {
          const todoData = mutation.modified as Partial<Todo>
          const id = (mutation.modified as Todo).id
          const response = await fetchWithRetry(`${BASE_URL}/api/todos/${id}`, {
            method: 'PUT',
            headers: {
              'Content-Type': 'application/json',
              'Idempotency-Key': idempotencyKey,
            },
            body: JSON.stringify({
              text: todoData.text,
              completed: todoData.completed,
            }),
          })
          if (!response.ok) {
            throw new Error(`Failed to sync update: ${response.statusText}`)
          }
          break
        }

        case 'delete': {
          const id = (mutation.original as Todo).id
          const response = await fetchWithRetry(`${BASE_URL}/api/todos/${id}`, {
            method: 'DELETE',