-- CreateTable
CREATE TABLE "chat_sessions" (
    "id" BIGSERIAL NOT NULL,
    "user_id" BIGINT NOT NULL,
    "title" VARCHAR(200),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updated_at" TIMESTAMP(3) NOT NULL,

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

-- CreateTable
CREATE TABLE "chat_messages" (
    "id" BIGSERIAL NOT NULL,
    "session_id" BIGINT NOT NULL,
    "role" VARCHAR(20) NOT NULL,
    "content" TEXT NOT NULL,
    "token_count" INTEGER NOT NULL DEFAULT 0,
    "provider" VARCHAR(64),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateIndex
CREATE INDEX "chat_sessions_user_id_idx" ON "chat_sessions"("user_id");

-- CreateIndex
CREATE INDEX "chat_messages_session_id_idx" ON "chat_messages"("session_id");

-- AddForeignKey
ALTER TABLE "chat_sessions" ADD CONSTRAINT "chat_sessions_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "chat_messages" ADD CONSTRAINT "chat_messages_session_id_fkey" FOREIGN KEY ("session_id") REFERENCES "chat_sessions"("id") ON DELETE CASCADE ON UPDATE CASCADE;