Module upgrade

In-place format upgrades and format validity checks for the Zebra state database.

Modules

• add_subtrees 🔒
  Fully populate the Sapling and Orchard note commitment subtrees for existing blocks in the database.
• cache_genesis_roots 🔒
  Updating the genesis note commitment trees to cache their roots.
• fix_tree_key_type 🔒
  Updating the sprout and history tree key type from Height to the empty key ().

Structs

• CancelFormatChange
  Marker type that is sent to cancel a format upgrade, and returned as an error on cancellation.
• DbFormatChangeThreadHandle
  A handle to a spawned format change thread.

Enums

• DbFormatChange
  The kind of database format change or validity check we’re performing.