I save lives,
I ruin lives.
If you push me, or otherwise, you'd better make sure I'm free.
Else, your strength will matter to no degree.
Even when I'm tiny.
Hint
It is a real life object. It has no direct connection to computers.
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Syringe
I save lives, I ruin lives.
A syringe can be used both to administer life-giving medicines and deadly illegal drugs.
If you push me, or otherwise, you'd better make sure I'm free.
If you put a syringe in your arm, you should make sure you got one from a doctor or free syringe exchange. Otherwise, you might infect yourself with something deadly
Else, your strength will matter to no degree.
If you get HIV or another disease from a dirty syringe, you will die no matter how strong you are...
Even when I'm tiny.
..or how small the needle was.
Title
Syringe sounds a little like cringe. And TTT has already solved the SQL clue.
You are:
Drugs
I save lives,
Medicinal drugs can save lives.
I ruin lives.
Certain drugs can ruin lives.
If you push me, or otherwise, you'd better make sure I'm free.
Still a little wonky here. "Pushing drugs" means "selling drugs", and any successful drug dealer knows you can't just give away your product away for free (at least not perpetually), so it seems the opposite would be true. But if you're "pushing people to take legal drugs", for example vaccines, then you better make sure they're free or else you won't be able to achieve high vaccination rates (if that's the goal), and you'll also alienate those that can't afford the drugs.
Else, your strength will matter to no degree.
If you're addicted to drugs, physical strength doesn't really matter (though mental strength does!)
Even when I'm tiny.
If you're addicted to drugs, and on a sober path, even a tiny amount of the drug can set you back.
Title: Not cringe.
It's not cringe to take drugs (legal, or otherwise), or even to be an addict, or a former addict.
Title: Not used in SQL.
Obviously we must avoid SQL injection!
Is the answer maybe
Memory
I save lives, I ruin lives
Remembering something can save lives, like breathing. Yet memory can also ruin the lives of programmers, or even to people close to some affected by memory-debilitating diseases
If you push me, you make sure I'm free
"Pushing" your memory would mean trying very hard to remember something, and that's hard to do with some other things in mind
Else, your strength will matter to no degree
No use in torturing yourself, even physically
Even when I'm tiny.
Even with a tiny memory, strength is of no use, some things are just left forgotten
Title
Memory is not cringe, and is not used in SQL
Largely guided by the title are you
A codebase ("based" = "not cringe" in modern youth parlance as I understand, likewise SQL is a language for databases not codebases)
I save lives,
Not sure here, but some critical software is used by emergency services for example, or gaming software comes with multiple lives and options to save.
I ruin lives.
Many coders would agree with this description.
If you push me, or otherwise, you make sure I'm free.
Else, your strength will matter to no degree.
Even when I'm tiny.
If pushing a software update to a codebase managed by git for example, it is necessary to check that the current version is not being used by someone else. This applies even to minor changes.
SQL
part is a bitknowledge
y, but it's only a minor, optional hint. I actually wouldn't have put it there were it not for the 12 character minimum title. $\endgroup$