Mutation without a write still triggers query (python client)

export const claimNextPending = mutation({
  args: { apiToken: v.string(), workerId: v.string() },
  handler: async (ctx, { apiToken, workerId }) => {
    if (apiToken !== process.env.NARRATOR_API_TOKEN)
      throw new Error('Unauthorized')
    const next = await ctx.db
      .query('articles')
      .withIndex('status', q => q.eq('status', 'pending'))
      .first()
    if (!next) {
      console.debug('No pending articles to claim')
      return null
    }

    // Mark as processing with a lease
    await ctx.db.patch(next._id, {
      status: 'processing',
      claimedBy: workerId,
      claimedAt: Date.now(),
      lastError: undefined,
    })

    return { _id: next._id, url: next.url }
  },
})