Remove invalid PHP config file and change alert message for db_queries.js

[rdwebdesign]

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• I have made only one major change in my proposed changes.
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• I have tested my proposed changes.
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What does this PR aim to accomplish?:

Remove unused .user.php.ini file.
Change the message shown in db_queries page, when an unexpected error occurs.

How does this PR accomplish the above?:

Deleting the file and adding a new message.

What documentation changes (if any) are needed to support this PR?:

None.

[yubiuser]

We need to change the docs here: https://docs.pi-hole.net/main/faq/#while-loading-data-from-the-long-term-database-you-encountered-an-error

I wonder if we should decrease the default memory limit. We still support RPi 1, which has only 256 MB. The whole system might freeze if everything is taken by PHP.

[yubiuser]

And maybe here:
https://github.com/pi-hole/AdminLTE/blob/bddcaf4e0588aec8320d907430a9fe1f68c5a467/scripts/pi-hole/js/db_queries.js#L87

[rdwebdesign]

I wonder if we should decrease the default memory limit. We still support RPi 1, which has only 256 MB. The whole system might freeze if everything is taken by PHP.

As far as I know, Raspberry Pis version 1 with 256 MB were discontinued a long time ago (from wikipedia).

Raspberry Pi1B (released in 2012) 256 MB  => Discontinued 
Raspberry Pi1B (released in 2012) 512 MB  => Discontinued 
Raspberry Pi1A (released in 2013) 256 MB  => No ethernet and no Wifi (probably not used for pi-hole)

Raspberry Pi1A+ (released in 2014) 512 MB  => No ethernet and no Wifi (probably not used for pi-hole) 
Raspberry Pi1B+ (released in 2014) 512 MB  => Available

[rdwebdesign]

Do you think the warning message should say something like that?

Check the server's log files (/var/log/lighttpd/error.log) for details.
You may need to increase PHP memory limit in .user.ini file.

Or should we point to the docs page?

Check the server's log files (/var/log/lighttpd/error.log) for details.
You can find more info in pi-hole's FAQ.

[yubiuser]

What happens if user change the limit and perform a Pi-hole update? Will the change be overwritten?

[yubiuser]

The goal of this PR changed during the development. Due to merging #2114 the amount of memory Pi-hole uses when retrieving a huge amount of data from the long-term database is dramatically reduced. Therefore there is no reason to increase the memory by default. user.ini wasn't used in the last 5 years since it has been created - there is no reason to keep it.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-14-web-v5-11-and-core-v5-9-released/53529/1