Add new article and specific for notes stylization

src/pages/articles/belarusian.mdx

@@ -2,10 +2,11 @@
 layout: '../../layouts/index.astro'
 title: 'Беларусский или белорусский'
 description: 'Беларусский или белорусский - как писать?'
-keys: 'nothing crypto free software libre self host'
+keys: 'Беларусь или Белоруссия белорусский беларусский'
 le: '19 Aug. 2025'
 ---
 
+<div class="article">
 ## Введение
 
 Вопрос "Беларусь или Белоруссия" здесь затронут не будет. Как беларус, могу сказать, что нам просто приятно, когда нас называют Беларусью, и мы считаем использование первого варианта минимальным уважением к нашему народу.
@@ -23,3 +24,4 @@ le: '19 Aug. 2025'
 Вот только слово Беларусь пишется с `а`. Что же пошло не так? Это заимствование из беларусского, и сейчас представляет из себя один цельный корень. Это значит, что при добавлении других морфем, в том числе суффикса -ск-, а в корне должно сохраняться. То есть самый логичный вариант - писать `беларусский`.<br/>Ну либо переходить на `Белорусь`, но...
 
 P.s. естественно, всё это не касается официальных докемнтов, потому что там, как это ни странно, необходимо использовать литератный стандарт.
+</div>

src/pages/articles/synapse-revitalization-script.mdx

@@ -0,0 +1,48 @@
+---
+layout: '../../layouts/index.astro'
+title: 'Restoration of Synapse after disappearing 1 year of database history'
+description: '?'
+keys: 'matrix synapse conduit'
+le: '19 Aug. 2025'
+---
+
+<div class="article">
+## Introduction
+In July 2025, my PostgreSQL had broken, so I needed to restore it from my 1-y.o. backup. I was thinking about what to do, and my friend sent me [this](https://blog.erethon.com/blog/2023/06/21/what-happens-when-a-matrix-server-disappears/) article, so we understood what to do!
+
+For example, there is a room called #example:example.org (roomid !example:example.org), whose member was @user:example.net.
+The problem is that every server knows @user:example.net is in the room #example:example.org. But our server doesn't! So that is what we should aim at solving the problem.
+
+## Architecture
+We get 2 types of error messages:
+- `synapse.handlers.receipts: [PUT-...] Ignoring receipt for room '!example:example.org' from server example.org as we're not in the room` (there is the same error message, but when you get a typing event from an unknown room)
+- `synapse.federation.federation_server: [PUT-...] Ignoring PDU for unknown room_id: !example:example.org`
+
+We can read the journal and parse the error message (I use a bash script to do that). 
+Okay, we have a room id! In the given article, the author is the only user of their server, so they can just send [POST /_matrix/client/v3/join/!example:example.org](https://spec.matrix.org/v1.15/client-server-api/#post_matrixclientv3joinroomidoralias) request, and everything will be good.
+But my server has multiple users, so I can't use the easiest way. We need to get information about membership (so we need to get state).
+
+As we are admins of our servers, we have their signing keys.
+We will need them because we are going to get state via Federation API requests.
+How? There are different ways to do that.
+However, all of them require at least 1 event id, so firstly we need to do [GET /_matrix/federation/v1/timestamp_to_event](https://spec.matrix.org/v1.15/server-server-api/#get_matrixfederationv1timestamp_to_eventroomid).
+Determining request parameters (?dir as direction (b[ackward] or f[orward]) and &ts as timestamp in Unix time format in milliseconds), we have just got either the last or the first event id! In my case, I chose the way of getting the last event, so then I'll have to make [GET /_matrix/federation/v1/state/!example:example.org?event_id=$event_id](https://spec.matrix.org/v1.15/server-server-api/#get_matrixfederationv1stateroomid), and I will get the actual state.
+Of course, both of the requests, as I said, should be signed using your server's key ([how to sign events](https://spec.matrix.org/v1.15/server-server-api/#signing-events)).
+<br />
+(There is no support of timestamp_to_event in Conduit, so it would be a good idea to make support of requesting different servers)
+
+After we receive the state, we need to parse it, but I think this can't make a difficulty.
+As a result, we have a list of our users that were in the given room, like ["@user:example.net", "@anotheruser:example.net", "@exampleuser:example.net"].
+Then, the simplest way is to get temporary user's auth token via [POST /_synapse/admin/v1/users/user_id/login](https://github.com/matrix-org/synapse/blob/develop/docs/admin_api/user_admin_api.md#login-as-a-user) and make [POST /_matrix/client/v3/join/!example:example.org](https://spec.matrix.org/v1.15/client-server-api/#post_matrixclientv3joinroomidoralias) from the name of the user using their token.
+The problem is solved!
+
+## External links
+- [Article that gave me the idea](https://blog.erethon.com/blog/2023/06/21/what-happens-when-a-matrix-server-disappears/)
+- [Matrix Federation API docs](https://spec.matrix.org/v1.15/server-server-api/)
+  - [How to sign Federation API requests](https://spec.matrix.org/v1.15/server-server-api/#signing-events)
+  - [GET /_matrix/federation/v1/state/!example:example.org?event_id=$event_id](https://spec.matrix.org/v1.15/server-server-api/#get_matrixfederationv1stateroomid)
+  - [GET /_matrix/federation/v1/timestamp_to_event](https://spec.matrix.org/v1.15/server-server-api/#get_matrixfederationv1timestamp_to_eventroomid)
+- [Matrix Client API docs](https://spec.matrix.org/v1.15/server-server-api/)
+  - [POST /_matrix/client/v3/join/!example:example.org](https://spec.matrix.org/v1.15/client-server-api/#post_matrixclientv3joinroomidoralias)
+- [Admin API POST /_synapse/admin/v1/users/user_id/login](https://github.com/matrix-org/synapse/blob/develop/docs/admin_api/user_admin_api.md#login-as-a-user)
+</div>

src/pages/notes.mdx

@@ -7,3 +7,6 @@ keys: 'nothing crypto free software libre self host'
 
 ## Linguistics
 - [Беларусский или белорусский](/articles/belarusian)
+
+## Computers
+- [Restoration of Synapse after disappearing 1 year of database history](/articles/synapse-revitalization-script)