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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Give temporary downloads a life limit."><title>MIGRATION_023 in jellytau_lib::storage::schema - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc constant"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">MIGRATION_023</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.10.1</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In jellytau_<wbr>lib::<wbr>storage::<wbr>schema</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">storage</a>::<wbr><a href="index.html">schema</a></div><h1>Constant <span class="constant">MIGRATION_<wbr>023</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/storage/schema.rs.html#814-821">Source</a> </span></div><pre class="rust item-decl"><code>const MIGRATION_023: &<a class="primitive" href="https://doc.rust-lang.org/1.97.1/std/primitive.str.html">str</a> = r#"
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ALTER TABLE downloads ADD COLUMN expires_at TEXT;
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-- Reclaim scans filter on expiry among 'auto' rows; index both so the sweep
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-- stays cheap as the cache tier grows.
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CREATE INDEX IF NOT EXISTS idx_downloads_expiry
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ON downloads(download_source, expires_at);
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"#;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Give temporary downloads a life limit.</p>
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<p>A cache entry is not a different kind of object from a download — it is a
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download with a shorter life. Modelling it as one <code>downloads</code> row with an
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expiry (rather than a parallel cache store) means there is a single storage
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accounting, a single eviction path, and no way for a cache and a download
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library to disagree about what is on disk.</p>
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<p><code>expires_at</code> is NULL for permanent rows, which is every row that exists
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today: <code>download_source</code> defaults to <code>'user'</code>, and a user’s own download
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never expires. Only <code>'auto'</code> rows get a timestamp, and they are reclaimed by
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whichever comes first — the expiry passing, or LRU eviction under space
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pressure (DR-126).</p>
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<p>TRACES: UR-071 | DR-127</p>
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</div></details></section></div></main></body></html> |