#1190 add index on delivery_id to prevent slow queries #1191
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Background is a shopware 6.4 installation. We have 3.4 million entries in the mysql table enqueue.
A query like: DELETE FROM enqueue WHERE delivery_id = '1ea18942-283b-4cfd-a24a-1bf9917a9d0f'
takes 20-60 seconds. CPU load is by 100%. So this provides a race condition as the enqueue-table is growing fast and deleting entries is very slow.
Creating directly in mysql an index on delivery_id solves the problem. Queries are again done in milliseconds.