fix architecture and write new tests

packages/database/prisma/migrations/20260609194500_reservation_public_access/migration.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS "reservation_public_access" (
+  "id" TEXT PRIMARY KEY,
+  "reservationId" TEXT NOT NULL,
+  "tokenHash" TEXT NOT NULL UNIQUE,
+  "expiresAt" TIMESTAMP(3) NOT NULL,
+  "usedAt" TIMESTAMP(3),
+  "revokedAt" TIMESTAMP(3),
+  "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  CONSTRAINT "reservation_public_access_reservationId_fkey"
+    FOREIGN KEY ("reservationId") REFERENCES "reservations"("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS "reservation_public_access_reservationId_idx" ON "reservation_public_access"("reservationId");