Better Auth configuration overwriting the organization's id type to number?

error: foreign key constraint "invitation_school_id_fkey" cannot be implemented
  ...
  detail: 'Key columns "school_id" and "id" are of incompatible types: text and bigint.',
  ...
}

export const auth = betterAuth({
  // ... othre configs

  // user config
  user: {
    fields: {
      name: "first_name",
      emailVerified: "email_verified",
      createdAt: "created_at",
      updatedAt: "updated_at",
    },
    additionalFields: {
// ...
      schoolId: {
        fieldName: "school_id",
        type: "number",
        required: false,
        defaultValue: null,
        input: true,
      },
    },
  },

  // plugins
  plugins: [
    nextCookies(), // required for nextjs
    organization({
      schema: {
        organization: {
          modelName: "schools",
          fields: {
            name: "name",
            slug: "slug",
            logo: "logo_url",
            createdAt: "created_at",
            updatedAt: "updated_at",
          },
        },
        member: {
          modelName: "user",
          fields: {
            organizationId: "school_id",
            userId: "id",
            role: "role",
            createdAt: "created_at",
            updatedAt: "updated_at",
          },
        },
        invitation: {
          fields: {
            organizationId: "school_id",
            expiresAt: "expires_at",
            inviterId: "inviter_id",
            createdAt: "created_at",
            updatedAt: "updated_at",
          },
        },
        session: {
          fields: {
            activeOrganizationId: "active_organization_id",
          },
        },
      },
    }),
  ],
});