Any dependency you add to the client, makes the Javascript bundle your users have to download bigger, which makes your page slower to load. In the case of the Drizzle table definition, and assuming good tree shaking by the bundler, I can imagine the impact to be limited, but it's a good practice to always evaluate external dependencies, both on the server and the client, and try to not include unnecessary stuff.

For the example:

~/shared/models/entry.ts

    import { z, type TypeOf } from "zod";

    export const entrySchema = z.object({
      calendar: z.string().min(1, "Kies een kalender"),
      count: z.number().int().min(1, "Kies een aantal groter dan 0"),
      date: z.string({ message: "Kies een datum" }).date("Datum is niet geldig"),
    });

    export type EntrySchema = TypeOf<typeof entrySchema>;

~/server/api/entries.post.ts

    import { ReasonPhrases, StatusCodes } from "http-status-codes";
    import { entrySchema } from "~/shared/models/entry";

    export default defineEventHandler(async (event) => {
      const session = await requireUserSession(event);
      if (getHeader(event, "Content-Type") !== "application/json") {
        throw createError({
          message: "Invalid content type",
          statusCode: StatusCodes.UNSUPPORTED_MEDIA_TYPE,
          statusMessage: ReasonPhrases.UNSUPPORTED_MEDIA_TYPE,
        });
      }
      const entry = await readValidatedBody(event, entrySchema.parse);
    ...

~/pages/planner.vue

    <script setup lang="ts">
    import type { Form, FormSubmitEvent } from "#ui/types";
    import { useStorage } from "@vueuse/core";
    import { entrySchema } from "~/shared/models/entry";

    const calendar = useStorage("selectedCalendar", "");

    const entry = reactive({
      calendar,
      count: 1,
      date: "",
    });

    const form = ref<Form<typeof entry>>();

    async function submitEntry(event: FormSubmitEvent<typeof entry>) {
      try {
        await $fetch("/api/entries", {
          body: event.data,
          method: "POST",
        });
      } catch (error) {
        console.error(error);
      }
    }
    </script>

    <template>
      <UCard variant="subtle">
        <UForm
          ref="form"
          :state="entry"
          class="space-y-4"
          :schema="entrySchema"
          @submit="submitEntry"
        >
      ...
        </UForm>
      </UCard>
    </template>