const trpc = useTRPC();
const { data, isLoading, refetch } = useQuery({
  ...trpc.router.procedure.queryOptions(),
  enabled: !!condition,
});

const trpc = useTRPC();
const queryClient = useQueryClient();

const mutation = useMutation(
  trpc.router.procedure.mutationOptions({
    onSuccess: () => {
      // Invalidate related queries
      queryClient.invalidateQueries({
        queryKey: trpc.router.relatedQuery.queryKey(),
      });
    },
  })
);

// Usage
await mutation.mutateAsync({ input: data });

import { createTRPCRouter, protectedProcedure } from '@/trpc/init';
import { z } from 'zod';

export const featureRouter = createTRPCRouter({
  queryName: protectedProcedure.query(async ({ ctx }) => {
    return await dbFunction({ userId: ctx.user.id });
  }),

  mutationName: protectedProcedure
    .input(z.object({ /* validation schema */ }))
    .mutation(async ({ ctx, input }) => {
      // Verify permissions/ownership
      // Call database function
      return await dbFunction(input);
    }),
});