Both functions wrap their read-modify-write in a Drizzle better-sqlite3
db.transaction((tx) => ...) with in-txn re-fetch so concurrent admin
mutations are serialized by SQLite's writer lock.
- patchInvite: 404 on missing, 409 on revoked, 400 on maxUses < usedCount,
allows expiresAt to be moved into the past (effective soft-shut).
- revokeInvite: 404 on missing, 409 on already-revoked (explicit reject,
not silent no-op).
Also extracts foldUsername() to collapse the duplicated
(username, isDeleted) -> display string fold across resolveCreatorUsername,
listInvites, and listRedemptions (deferred refactor from Task 5 review).
Note: the plan's example used db.transaction(cb)() with an IIFE,
which is the raw better-sqlite3 signature. Drizzle's wrapper
returns the callback's return value directly, so we use the
(tx) => ... form consistent with the rest of the codebase
(userDeletion, federation, channels, etc.).
Tests: 36 invite-service tests pass (27 prior + 9 new).
Full server suite: 40 files / 311 tests pass.
Jannis Braun
23338419df