Add commands/async.h (LISTEN/NOTIFY) bindings#2344
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feat(pgrx): safe notify/listen/unlisten wrappers over async.h feat(examples): add coalesced transaction-end NOTIFY pattern
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What
commands/async.hin pgrx-pg-sys for pg13–pg19, exposingAsync_Notify/Async_Listen/Async_Unlisten/Async_UnlistenAll.notifyexample: safe&strwrappers over those externs plus a real-world cache-invalidation trigger thatNOTIFYs a changed row's id oncache_invalidation.Why
LISTEN/NOTIFY is the only in-core mechanism for inter-process signalling substitute — delivery goes through Postgres's async queue. Server-side
LISTENin particular has no SQL-function equivalent.