Ah, then no, the last thing I knew about it you can’t migrate accounts from one server to another, which is what you’re trying to do here.
As I mentioned if you were able to move the keys which identify your account it would be easy for someone to impersonate you.
Also, your public keys are shared among all the instances you’ve interacted, so this might break your interactions there.

Do you still have the old database? You should be able to move your instance around as long as you have a dump of your DB, that’s where all the keys of each community and user in your instance are. Those are the ones telling other instances you’re actually you, if you loose those I don’t know what can be done so other instances flush your old content and treat you as a new account. But I would count on thi s being a feature since it could lead to people impersonating someone else if they get a hold of the domain without the DB.

EDIT: amm, maybe I didn’t understand correctly, are you trying to move to a new domain? Or to a new server with the same domain?
What’s re-home?

It’s been great and not that expensive using a VPS.
$6 for the vps and $1 for 40GB HDD.
Although the HDD probably is making my instance slow, to improve it it’d be $4 for 40GB of SSD, but since the instance is only for me I don’t have any issue in waiting a few minutes.

Kind of, but just because I deployed it xP

You’re thinking of reimplementing something like git which some wiki open source project might as well already have solved.
So, the answer will be the same: it’ll be better to have a dedicated project/service.

I’m wondering if that would be too niche or something which should be its own project, and those in need of a suitable solution would be better deploying a dedicated service.

I mean, for example lemmy has PMs, but if there’s a notice to move to a dedicated messaging service for more privacy and functionality.

So, for a “wiki” the sidebar usually is enough to have the rules and links to sites with more information and a better structure.

Post, edits and deletes are federated in lemmy.
The Devs have said the issue comes from the internet itself where instances could be some times not reachable when the activity is sent.
There’s also the case where a post hasn’t showed up in all instances or has more comments in one instance than others.

Again, it’s the same in reddit, if you create a new sub no one can see it because reddit doesn’t share what new communities there are, they’re hidden from the search unless you know the exact name or until they have enough activity, but it’s a cycle where you can’t have enough activity because it doesn’t appear in searches.
The answer in both, reddit and lemmy, is crossposting, you need to promote your new community with good content.
Or sharing it in communities like !wowthislemmyexists@lemmy.ca or !lemmy411@lemmy.ca
There’s also this site, tho I don’t know how it gets populated https://browse.feddit.de/

It’s the same as in reddit, you can find r/unpopularopinion and r/TrueUnpopularOpinion, or off my chest, or shower thoughts (with the UL one).
It’d be like asking those communities should only have one feed.
Similarly here you can have !piracy@lemmy.ml and !piracy@lemmy.world and you’d have to decide which one is more aligned with your idea of what the community should be.
And if you don’t like it, then you can create a new community in another instance without having to fight for the same name (I could create one in my instance like !piracy@lemmy.pe1uca.dev)

I think is the latter.
IIRC in the code when receiving the downvote the instance just rejects it.
So only in the instance where it was generated gets recorded.

Edit: here’s the rejection message. I can’t see the whole flow since I’m not at my PC, but it’s inside a verify function, so I assume it gets called right when the activity is received before being processed.
https://github.com/LemmyNet/lemmy/blob/main/crates/apub/src/activities/voting/vote.rs#L66

The command to connect to the DB is psql -U <user> <DB_name>.
Usually you also have to use the -p flag but I’ve been connecting directly to the container without it. Not sure if it’s because the container already has the password in a environment variable

Won’t happen, one of the pros of how it works comes from the Devs themselves:
You could have two news communities but you’ll know you have news@lemmy.ca and news@lemmy.uk or something similar.

For general communities might be confusing, but you still have this in reddit and other similar platforms, you have r/memes, r/dankmemes, r/dank_meme, and many others.

I have a single user instance, 1vCPU 1GB ram, and lemmy itself is using around 300MB of disk.
I’ve only had it for less than a week so maybe disk space will go up quite quickly.
CPU never goes above 10% while I’m using it and ram stays around 600MB.
The issue with disk are the logs, I solved it configuring docker to rotate files and just keep 4. Not sure how it could be done with the other installation instructions.

AFAIK the bottleneck currently is CPU, with the upgrade of lemmy.ml to the 8vCPU they are at full usage but ram sits around 6GB.
They’re working on optimizing some queries.

I was very sad when the manga ended!
I might read it again xP