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Thary
2025-08-23 04:17:24 +03:00
parent 92a0078b8b
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<meta name="viewport" content="width=device-width">
<!--<link rel="icon" type="image/svg+xml" href="/favicon.svg" />-->
<meta name="generator" content="Astro v2.10.7">
<meta name="description" content="{frontmatter.description}">
<meta name="keywords" content="nothing crypto free software libre self host {frontmatter.keys}">
<meta name="description" content="Беларусский или белорусский - как писать?">
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<meta name="keywords" content="Беларусь или Белоруссия белорусский беларусский">
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<link rel="icon" href="/nothingrun-favicon-whiteonblack.png" type="image/png">

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<meta name="viewport" content="width=device-width">
<!--<link rel="icon" type="image/svg+xml" href="/favicon.svg" />-->
<meta name="generator" content="Astro v2.10.7">
<meta name="description" content="{frontmatter.description}">
<meta name="keywords" content="nothing crypto free software libre self host {frontmatter.keys}">
<meta name="description" content="Restoration of Synapse after losing 1 year of database history">
<meta name="keywords" content="nothing.run nothing privacy free libre software floss self host">
<meta name="keywords" content="matrix synapse conduit postgres">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Restoration of Synapse after disappearing 1 year of database history</title>
<title>Restoration of Synapse after losing 1 year of database history</title>
<link rel="stylesheet" href="/_astro/contact.8ef370d5.css" /></head>
<body>
<div class="header astro-HPNW4VWY">
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<a href="/donate" class="astro-HPNW4VWY">Donate :3</a>
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<h1>Restoration of Synapse after disappearing 1 year of database history</h1>
<h1>Restoration of Synapse after losing 1 year of database history</h1>
<div class="article"><h2 id="introduction">Introduction</h2><p>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 <a href="https://blog.erethon.com/blog/2023/06/21/what-happens-when-a-matrix-server-disappears/">this</a> article, so we understood what to do!</p><p>For example, there is a room called #example:example.org (roomid !example:example.org), whose member was @user:example.net.
<div class="article"><h2 id="introduction">Introduction</h2><p>In July 2025, my Synapse 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 <a href="https://blog.erethon.com/blog/2023/06/21/what-happens-when-a-matrix-server-disappears/">this</a> article, so we understood what to do!</p><p>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.</p><h2 id="architecture">Architecture</h2><p>We get 2 types of error messages:</p><ul>
<li><code>synapse.handlers.receipts: [PUT-...] Ignoring receipt for room &#39;!example:example.org&#39; from server example.org as we&#39;re not in the room</code> (there is the same error message, but when you get a typing event from an unknown room)</li>
<li><code>synapse.federation.federation_server: [PUT-...] Ignoring PDU for unknown room_id: !example:example.org</code></li>