实现制度签收轻量回执（05-28-oa-policy-acknowledgement-v1）

server/prisma/migrations/20260528113000_policy_acknowledgements/migration.sql

@@ -0,0 +1,43 @@
+ALTER TABLE "portal_announcements"
+  ADD COLUMN "category" TEXT NOT NULL DEFAULT 'general',
+  ADD COLUMN "requires_acknowledgement" BOOLEAN NOT NULL DEFAULT false,
+  ADD COLUMN "acknowledgement_statement" TEXT,
+  ADD COLUMN "acknowledgement_due_at" TIMESTAMP(3);
+
+CREATE TABLE "portal_announcement_acknowledgements" (
+    "id" UUID NOT NULL,
+    "announcement_id" UUID NOT NULL,
+    "employee_id" UUID NOT NULL,
+    "acknowledged_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "statement_snapshot" TEXT NOT NULL,
+    "title_snapshot" TEXT NOT NULL,
+    "summary_snapshot" TEXT NOT NULL,
+    "actor_id" UUID NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "portal_announcement_acknowledgements_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "portal_announcement_acknowledgements_announcement_id_employee_id_key"
+    ON "portal_announcement_acknowledgements"("announcement_id", "employee_id");
+
+CREATE INDEX "portal_announcement_acknowledgements_employee_id_acknowledged_at_idx"
+    ON "portal_announcement_acknowledgements"("employee_id", "acknowledged_at");
+
+CREATE INDEX "portal_announcement_acknowledgements_announcement_id_acknowledged_at_idx"
+    ON "portal_announcement_acknowledgements"("announcement_id", "acknowledged_at");
+
+ALTER TABLE "portal_announcement_acknowledgements"
+    ADD CONSTRAINT "portal_announcement_acknowledgements_announcement_id_fkey"
+    FOREIGN KEY ("announcement_id") REFERENCES "portal_announcements"("id")
+    ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE "portal_announcement_acknowledgements"
+    ADD CONSTRAINT "portal_announcement_acknowledgements_employee_id_fkey"
+    FOREIGN KEY ("employee_id") REFERENCES "employees"("id")
+    ON DELETE RESTRICT ON UPDATE CASCADE;
+
+ALTER TABLE "portal_announcement_acknowledgements"
+    ADD CONSTRAINT "portal_announcement_acknowledgements_actor_id_fkey"
+    FOREIGN KEY ("actor_id") REFERENCES "employees"("id")
+    ON DELETE RESTRICT ON UPDATE CASCADE;