Magento is a complex beast and tracking down the source of a database query can be a huge pain. Recently I had to track down the source of a set of queries. I could see the queries in the SQL query logs but wasn’t able to figure out which particular piece of code would execute them because the functionality that triggered these was used all over the place.

I ended up adding the PHP stack trace that executed a SQL query to each query as a comment before the query. That way the full stack trace would show up in the MySQL query logs.
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