Option
cache of project
What the engine tells a cache that stands outside it: the header in which every public answer names the tables it read, so that such a cache drops by key what a write made stale.
Value
{ keysHeader }, the name of a header, as 'surrogate-key'. Every answer of a screen that states cache: { public: true } then carries in it each table its queries read, as t:<table>, between spaces, and the event page.stale holds the keys of each write too (word.event). Before a switch turns visitors over, the engine draws the addresses asked most in the last day into the cache of the new version, up to limits.warmPages (200) within limits.warmTime (30 seconds). Left out, no answer carries such a header.
Example
TypeScript
export const shop = project('shop', {
cache: { keysHeader: 'surrogate-key' },
})