MSPSDS-472: Improve technical setup

[jasiekmiko]

The code changes comprise:

• De-verbalising logs via Lograge
• Adding timeouts Slowpoke
• Adding db admin dashboard pgHero
• NOT adding the secure_headers gem as this is already covered by rails (see Confirm feature parity with secure_headers <=> rails vanilla github/secure_headers#394)
• Preventing host header injection (following this piece of advice

[broder]

Do we want this in production? Also, do we need to be running https://github.com/ankane/pghero/blob/master/guides/Rails.md#historical-query-stats?

[jasiekmiko]

I think we very much do - otherwise we can't properly evaluate the performance.
And that was one of my comments, do
https://github.com/ankane/pghero/blob/master/guides/Rails.md#historical-query-stats and
https://github.com/ankane/pghero/blob/master/guides/Rails.md#historical-space-stats
seem useful here?
I'm tempted to say yes, but also not sure what we'd want to use for the stats capture scheduling. I've had quick look at https://github.com/ondrejbartas/sidekiq-cron, am i barking up the right tree here?

[jasiekmiko]

Finally, there's a recommendation to use a separate user for phHero, but the required approach seems super messy:
https://github.com/ankane/pghero/blob/master/guides/Permissions.md

[broder]

sidekiq-cron sounds like it might work!

[coveralls]

Pull Request Test Coverage Report for Build 1155

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 94.308%

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Totals
Change from base Build 1150:	0.02%
Covered Lines:	2336
Relevant Lines:	2477

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💛 - Coveralls

[jasiekmiko]

Damn it, I've written a whole host of comments before putting into review that I've accidentally deleted now :P

[jasiekmiko]

@broder as discussed, I'll want to push this through and leave enabling pghero historical stats to a separate PR

[broder]

Looks good, thanks!