feature: sending invitation link for newly created staff implemented.

backend/prisma/migrations/20260430091832_staff_invites_activation/migration.sql

@@ -0,0 +1,29 @@
+-- AlterTable
+ALTER TABLE "memberships" ADD COLUMN     "isActive" BOOLEAN NOT NULL DEFAULT true;
+
+-- CreateTable
+CREATE TABLE "staff_invitations" (
+    "id" TEXT NOT NULL,
+    "membershipId" TEXT NOT NULL,
+    "invitedById" TEXT NOT NULL,
+    "tokenHash" TEXT NOT NULL,
+    "expiresAt" TIMESTAMP(3) NOT NULL,
+    "acceptedAt" TIMESTAMP(3),
+    "revokedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "staff_invitations_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "staff_invitations_tokenHash_key" ON "staff_invitations"("tokenHash");
+
+-- CreateIndex
+CREATE INDEX "staff_invitations_membershipId_createdAt_idx" ON "staff_invitations"("membershipId", "createdAt");
+
+-- AddForeignKey
+ALTER TABLE "staff_invitations" ADD CONSTRAINT "staff_invitations_membershipId_fkey" FOREIGN KEY ("membershipId") REFERENCES "memberships"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "staff_invitations" ADD CONSTRAINT "staff_invitations_invitedById_fkey" FOREIGN KEY ("invitedById") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;