v3.20.0

Highlights

• @byline/core, @byline/db-postgres — added virtual fields, a new virtual: true flag on any field. A virtual field is edited in the admin and travels with the save like any other value — so every lifecycle hook (beforeCreate / beforeUpdate and the after* counterparts) sees it in the in-flight data — but it is never persisted and never read back. The storage flatten step skips it wholesale (no store_* row is written), which is the single enforcement point adapters must honour. The canonical use case is a transient control such as a "generate thumbnail" checkbox that triggers a side effect during the save without leaving a stored value that could re-fire on the next save. Virtual applies at any nesting depth — a virtual field inside an array item group is skipped per item, and marking a structure field (group / array / blocks) virtual omits the entire subtree. validateCollections() enforces the constraints at boot: a virtual field must be optional or carry a defaultValue; counter, upload-capable file / image, and any field referenced by useAsTitle / useAsPath / search cannot be virtual.

Bug Fixes

• @byline/admin, @byline/core — fixed array item removal silently no-opping. Removing an item from an array field and saving could leave the removed item in place — it would reappear on the next load — because the removal patch was dropped during patch application. The array.* patch handling in apply-patches and the array field widget now apply removals correctly, with regression coverage added to the patch test suite.

All other @byline/* packages bumped to 3.20.0 in lockstep with no behavioural changes this cycle.