db_schema.xml

<?xml version="1.0"?>

<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
    <table name="commerce365_cached_price" resource="default" engine="innodb" comment="Commerce365 Prices Table">
        <column xsi:type="bigint" name="id" padding="20" unsigned="true" nullable="false" identity="true" comment="Id"/>
        <column xsi:type="int" name="product_id" unsigned="true" nullable="false" identity="false" comment="Product Id"/>
        <column xsi:type="int" name="customer_id" unsigned="true" nullable="true" identity="false" comment="Customer Id"/>
        <column xsi:type="text" name="price_data"  nullable="false" comment="Price Data"/>
        <column xsi:type="timestamp" name="last_updated" on_update="true" nullable="false" default="CURRENT_TIMESTAMP"  comment="Last Updated"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="id"/>
        </constraint>
        <constraint xsi:type="unique" referenceId="UNIQUE_PAIR">
            <column name="product_id"/>
            <column name="customer_id"/>
        </constraint>
        <constraint xsi:type="foreign" referenceId="COMMERCE365_CACHED_PRICE_CUSTOMER_ID_CUSTOMER_ENTITY_ENTITY_ID"
                  table="commerce365_cached_price" column="customer_id" referenceTable="customer_entity"
                  referenceColumn="entity_id" onDelete="CASCADE"/>
        <constraint xsi:type="foreign" referenceId="LSWF_CACHED_PRICE_PRD_ID_CAT_PRD_ENTT_ENTT_ID"
                  table="commerce365_cached_price" column="product_id" referenceTable="catalog_product_entity"
                  referenceColumn="entity_id" onDelete="CASCADE"/>
    </table>
    <table name="commerce365_customer_price_token" resource="default" engine="innodb" comment="Commerce365 Customer Token Table">
        <column xsi:type="int" name="id" unsigned="true" nullable="false" identity="true" comment="Id"/>
        <column xsi:type="int" name="customer_id" unsigned="true" nullable="true" identity="false" comment="Customer Id"/>
        <column xsi:type="varchar" name="token" nullable="true" length="128" comment="Customer token"/>
        <constraint xsi:type="foreign" referenceId="COMMERCE365_CUSTOMER_PRICE_TOKEN_CUSTOMER_ID_CUSTOMER_ENTITY_ENTITY_ID"
                    table="commerce365_customer_price_token" column="customer_id" referenceTable="customer_entity"
                    referenceColumn="entity_id" onDelete="CASCADE"/>
        <constraint xsi:type="unique" referenceId="UNIQUE_CUSTOMER_ID">
            <column name="customer_id"/>
        </constraint>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="id"/>
        </constraint>
    </table>
</schema>