Consider rebalancing of nodes for RelativePositioning
When nodes are clumped together, there's a higher chance that we'd need to update multiple rows to make space when ordering some nodes.
Some options on rebalancing:
- Add a button on the admin page where instance admins can trigger a rebalance
- Automatically rebalance once we detect gapless sequences during ordering
We might need to disable ordering while the rebalancing is in progress to prevent race conditions.
cc @smcgivern