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Allowing third-party modules to alter the query executed by a module

I am developing a module that exposes a public API, which includes functions to save data in his own database table, which is supposed to be used from any module that uses my module.

The module checks the content of the database to verify if a user is not allowed to access the site, or if users should be notified with an error message when they change something in their user profiles.
Considering that in most of the cases, the database table is the only table to check, should I change the code to allow third-party modules to alter the query being executed from my module through hook_query_TAG_alter() (or the more generic hook_query_alter()), or use a custom hook that other modules need to implement?

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Allowing third-party modules to alter the query executed by a module

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