-- CreateTable
CREATE TABLE "tasks" (
    "id" TEXT NOT NULL,
    "tenant_id" TEXT NOT NULL,
    "type" TEXT NOT NULL,
    "title" TEXT NOT NULL,
    "status" TEXT NOT NULL DEFAULT 'OPEN',
    "entity_type" TEXT,
    "entity_id" TEXT,
    "entity_ref" TEXT,
    "assignee_id" TEXT,
    "created_by_id" TEXT,
    "due_date" TIMESTAMP(3),
    "resolved_by_id" TEXT,
    "resolved_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updated_at" TIMESTAMP(3) NOT NULL,

    CONSTRAINT "tasks_pkey" PRIMARY KEY ("id")
);

-- CreateTable
CREATE TABLE "task_comments" (
    "id" TEXT NOT NULL,
    "tenant_id" TEXT NOT NULL,
    "task_id" TEXT NOT NULL,
    "author_id" TEXT,
    "kind" TEXT NOT NULL DEFAULT 'comment',
    "body" TEXT NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "task_comments_pkey" PRIMARY KEY ("id")
);

-- CreateIndex
CREATE INDEX "tasks_tenant_id_status_idx" ON "tasks"("tenant_id", "status");

-- CreateIndex
CREATE INDEX "tasks_tenant_id_assignee_id_status_idx" ON "tasks"("tenant_id", "assignee_id", "status");

-- CreateIndex
CREATE INDEX "task_comments_tenant_id_task_id_idx" ON "task_comments"("tenant_id", "task_id");

-- AddForeignKey
ALTER TABLE "task_comments" ADD CONSTRAINT "task_comments_task_id_fkey" FOREIGN KEY ("task_id") REFERENCES "tasks"("id") ON DELETE CASCADE ON UPDATE CASCADE;


-- RLS für die neuen mandantenbezogenen Tabellen (zweite Verteidigungslinie).
DO $$
DECLARE t text;
BEGIN
  FOREACH t IN ARRAY ARRAY['tasks','task_comments'] LOOP
    EXECUTE format('ALTER TABLE %I ENABLE ROW LEVEL SECURITY', t);
    EXECUTE format('CREATE POLICY tenant_isolation ON %I USING (tenant_id = current_setting(''app.tenant_id'', true))', t);
  END LOOP;
END $$;