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<title>Postgres Migration Lock
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:root{color-scheme:light}body{margin:0;font:15px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;background:#faf9f5;color:#1a1512}
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.wrap{max-width:960px;margin:0 auto;padding:28px 18px 60px}h1{font-size:26px;margin:0 0 6px}.lede{color:#4a403a;margin:0 0 16px}
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<!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/pg-migration-lock-lint"></head>
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<body>
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<div class="wrap">
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<h1>Postgres Migration Lock
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<p class="lede">Find the statements in your Rails, Django or raw SQL migrations that take a table-blocking Postgres lock - and the safe rewrite - before you deploy. Runs entirely in your browser — nothing is uploaded.</p>
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<textarea id="src" spellcheck="false">-- orders: add tenancy + tighten money columns (generated, reviewed by nobody)
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BEGIN;
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<section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get one email when this rule changes</b><div style="opacity:.78;margin:.35rem 0 .8rem">We watch the regulation and vendor sources behind Postgres Migration Lock Lint every day. When a rule changes, you get a single email with what changed and the updated check. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Notify me</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">You're on the list. One email when it changes.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"pg-migration-lock-lint",lang:"en",source:"rule_alert"})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script></section>
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<section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://marketplace.visualstudio.com/items?itemName=ReadyStack.pg-migration-lock-lint" rel="noopener" data-yj-install-door="mp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'mp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">VS Code Marketplace</a><a href="https://open-vsx.org/extension/readystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><a href="https://www.npmjs.com/package/@readystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="npm" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'npm',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">npm</a><a href="https://hub.docker.com/r/getreadystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="docker" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'docker',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Docker Hub</a><pre style="margin:.5rem 0 0;padding:.6rem .8rem;background:#f3f5f8;border-radius:8px;font-size:.9rem;overflow:auto">ext install ReadyStack.pg-migration-lock-lint
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npx @readystack/pg-migration-lock-lint <file>
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<section data-yj-
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<section data-yj="yj-facts-v1" style="max-width:920px;margin:48px auto 0;padding:0 20px;font-family:system-ui,sans-serif"><style>.yj-article p{font:400 15.5px/1.7 system-ui,sans-serif;color:#26313b;margin:0 0 12px;max-width:72ch}.yj-article h2,.yj-article h3,.yj-article h4{font:600 17px/1.35 system-ui,sans-serif;color:#1b1f24;margin:22px 0 8px}.yj-article table{border-collapse:collapse;margin:10px 0 16px;font:14px/1.45 system-ui,sans-serif}.yj-article th,.yj-article td{border:1px solid #e2e6ea;padding:6px 10px;text-align:left}.yj-article th{background:#f4f6f8}.yj-article pre{background:#0f1720;color:#e6edf3;padding:12px 14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,Menlo,monospace}.yj-article code{font:13px ui-monospace,Menlo,monospace;background:#f1f3f5;padding:1px 4px;border-radius:3px}.yj-article pre code{background:none;padding:0}.yj-article ul,.yj-article ol{font:15px/1.6 system-ui,sans-serif;color:#26313b}</style><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does Postgres Migration Lock Lint actually do?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads a migration file and names every statement that takes a lock Postgres will not share, such as ACCESS EXCLUSIVE on a table rewrite or SHARE on a plain CREATE INDEX. 36 rules, PostgreSQL 12-17. On the bundled 20-statement sample migration it returns 22 findings, 16 of them at error severity; the hand-split version of the same schema change returns 0 findings.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is this for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Rails and Django engineers who deploy to a Postgres database that has real traffic, and anyone reviewing raw .sql migrations written by an assistant. It is aimed at the person who runs the deploy and gets paged when a table stops answering, not at a greenfield project where every table is empty.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why do free tools not cover this?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">strong_migrations reads only the Rails DSL, squawk reads only raw SQL, and both run in CI after the migration is already in a pull request. Neither reads a Django operations list. This runs on the file in your editor, across all three formats, before the branch exists, and it knows which forms became safe in PostgreSQL 11 and 12.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what needs the licence key?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Free: the migration file you have open, checked against all 36 rules, with the full message and the safe rewrite. No key, no limit on how often. The full version adds scope and ownership: every migration in the workspace in one pass, the review exported as Markdown or JSON for the change ticket, and an exit code for CI.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does the alternative cost?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Independent Postgres consultancies bill migration and lock review at $150 an hour and up, and an incident review costs more than that once on-call time is counted. This is $29 once, with a 7-day full refund. The free tier covers the file you are editing right now at no cost at all.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does Postgres Migration Lock Lint actually do?", "acceptedAnswer": {"@type": "Answer", "text": "It reads a migration file and names every statement that takes a lock Postgres will not share, such as ACCESS EXCLUSIVE on a table rewrite or SHARE on a plain CREATE INDEX. 36 rules, PostgreSQL 12-17. On the bundled 20-statement sample migration it returns 22 findings, 16 of them at error severity; the hand-split version of the same schema change returns 0 findings."}}, {"@type": "Question", "name": "Who is this for?", "acceptedAnswer": {"@type": "Answer", "text": "Rails and Django engineers who deploy to a Postgres database that has real traffic, and anyone reviewing raw .sql migrations written by an assistant. 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The full version is a one-time licence, 7-day refund.</p><div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px"><a class="yj-rel-c" href="https://getreadystack.com/tools/robots-txt-ai-crawler-audit"><span class="yj-rel-t">AI Crawler Rules - robots.txt Audit for AI Search</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/bulk-sender-lint"><span class="yj-rel-t">Bulk Sender Lint - the Gmail, Yahoo and Outlook.com rules, checked in your mai</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/devicetree-config-language-pack"><span class="yj-rel-t">DeviceTree Config Audit: 23 dtc-Style Rules, 50 Snippets</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/en301549-lint"><span class="yj-rel-t">EN 301 549 Lint — European Accessibility Act rules, with the clause number, in</span><span 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<title>Postgres Migration Lock check — check migration locks free</title>
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<h1>Postgres Migration Lock check — check migration locks free</h1>
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<p class="lede">Find the statements in your Rails, Django or raw SQL migrations that take a table-blocking Postgres lock - and the safe rewrite - before you deploy. Runs entirely in your browser — nothing is uploaded.</p>
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<textarea id="src" spellcheck="false">-- orders: add tenancy + tighten money columns (generated, reviewed by nobody)
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<section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://marketplace.visualstudio.com/items?itemName=ReadyStack.pg-migration-lock-lint" rel="noopener" data-yj-install-door="mp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'mp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">VS Code Marketplace</a><a href="https://open-vsx.org/extension/readystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><a href="https://www.npmjs.com/package/@readystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="npm" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'npm',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">npm</a><a href="https://www.npmjs.com/package/@readystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="mcp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'mcp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">MCP server (npx)</a><a href="https://hub.docker.com/r/getreadystack/pg-migration-lock-lint" rel="noopener" data-yj-install-door="docker" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pg-migration-lock-lint',src:'docker',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Docker Hub</a><pre style="margin:.5rem 0 0;padding:.6rem .8rem;background:#f3f5f8;border-radius:8px;font-size:.9rem;overflow:auto">ext install ReadyStack.pg-migration-lock-lint
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npx @readystack/pg-migration-lock-lint <file>
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npx @readystack/pg-migration-lock-lint --mcp</pre><p style="margin:.6rem 0 0;font-size:.92rem;color:#41505f"><a href="https://getreadystack.com/api/buy/cl/polar_cl_l6iN1uWt0FwWu7tBsczD0jWpP2vxFM54Wdwqb3KPi1G" rel="nofollow" style="color:#0f7b3f;text-decoration:underline">Team? One key for every ReadyStack linter, 5 seats, $149 once</a></p></section>
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<section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get the full rule table as a PDF</b><div style="opacity:.78;margin:.35rem 0 .8rem">All 36 rules Postgres Migration Lock Lint checks, each with its source and date, on printable pages you can hand to your team or auditor. We email it now, and once more only if a rule changes. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Email me the PDF</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">Sent. It arrives within the hour - check spam too.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"pg-migration-lock-lint",lang:"en",source:"rule_table"+((b.closest&&b.closest("section")&&b.closest("section").getAttribute("data-yj-moved"))?"_at_result":"")})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script><script>(function(){var e=document.getElementById("yjae"),s=e&&e.closest?e.closest("section"):null,o=document.getElementById("out");if(!s||!o)return;var d=false;function mv(ev){if(d)return;if(ev&&ev.target&&s.contains(ev.target))return;d=true;var b=o;while(b.parentNode&&b.parentNode!==document.body&&b.parentNode.tagName!=="MAIN"&&b.parentNode.tagName!=="ARTICLE")b=b.parentNode;if(!b.parentNode||b===s||b.contains(s))return;try{b.parentNode.insertBefore(s,b.nextSibling);s.setAttribute("data-yj-moved","1");}catch(_){}}document.addEventListener("input",mv,true);document.addEventListener("change",mv,true);})();</script></section>
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<section data-yj-cta="paid" style="margin:3rem auto;max-width:46rem;padding:1.5rem 1.25rem;border:1px solid #d8dee9;border-radius:12px;background:#fbfcfe;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .5rem;font-size:1.25rem">Get the complete version <span class="yj-price">$29</span></h2><p style="margin:.25rem 0 1rem;color:#41505f">This page is the working piece. The full pack has everything below.</p><p style="margin:0 0 1rem;color:#41505f">Names every statement in a Rails, Django or raw SQL migration that takes a table-blocking Postgres lock, and prints the non-blocking rewrite. 36 rules, PostgreSQL 12-17.</p><p style="margin:0 0 1rem;color:#5b6b7c;font-size:.94rem">Independent Postgres consultancies bill migration and lock review at $150/hour and up; this is one review, priced once.</p><a href="https://getreadystack.com/api/buy/cl/polar_cl_zaJ9pwhlczNQZUXiIKP3wGCzfzxe2LYQ6mMD02xD1j5" rel="nofollow" style="display:inline-block;padding:.7rem 1.3rem;border-radius:8px;background:#1b64f2;color:#fff;text-decoration:none;font-weight:600">Buy the full version — $29</a></section>
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<!--yj-share-s101--><div style="margin:28px 0 8px;text-align:center"><button id="yjcp" type="button" style="font:inherit;padding:10px 18px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Copy link</button><button id="yjimg" type="button" style="font:inherit;padding:10px 18px;margin-left:8px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Save result as image</button></div><script>(function(){var b=document.getElementById("yjimg");if(!b)return;b.addEventListener("click",function(){var o=document.getElementById("out");var txt=(o&&(o.innerText||o.textContent)||"").trim();if(!txt){b.textContent="(no result yet)";setTimeout(function(){b.textContent="Save result as image";},1500);return;}var lines=txt.split(String.fromCharCode(10)).filter(function(x){return x.trim();}).slice(0,10);var W=1200,P=56,c=document.createElement("canvas");c.width=W;var lh=38,H=P*2+70+lines.length*lh+60;c.height=H;var x=c.getContext("2d");x.fillStyle="#1a1512";x.fillRect(0,0,W,H);x.fillStyle="#f3e9d2";x.font="600 34px system-ui,Segoe UI,Arial";var t=(document.title||"").split("|")[0].trim();x.fillText(t.slice(0,54),P,P+34);x.font="22px ui-monospace,Menlo,Consolas,monospace";x.fillStyle="#e8dcc4";for(var i=0;i<lines.length;i++){x.fillText(lines[i].slice(0,88),P,P+70+i*lh+22);}x.font="600 22px system-ui,Segoe UI,Arial";x.fillStyle="#c9a227";var d=location.hostname.replace("www.","");x.fillText(d,W-P-x.measureText(d).width,H-P+6);c.toBlob(function(bl){var u=URL.createObjectURL(bl),a=document.createElement("a");a.href=u;a.download=(t||"result").replace(/[^a-z0-9]+/gi,"-").toLowerCase()+"-"+d+".png";document.body.appendChild(a);a.click();setTimeout(function(){URL.revokeObjectURL(u);a.remove();},2000);},"image/png");});})();</script><script>(function(){var b=document.getElementById("yjcp");if(!b)return;var t=b.textContent;b.addEventListener("click",function(){var u=location.href.split("#")[0];function d(){b.textContent="Link copied";setTimeout(function(){b.textContent=t;},1800);}if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(u).then(d,function(){prompt("",u);});}else{prompt("",u);}});})();</script><div class="yj-home-find"><div class="yj-lgbar"><a href="/" class="yj-lg on">EN</a><a href="/de/" class="yj-lg">DE</a><a href="/ja/" class="yj-lg">JA</a><a href="/es/" class="yj-lg">ES</a><a href="/pt/" class="yj-lg">PT</a></div><section class="yj-find"><h2>Find a tool</h2><input id="yjq" type="search" autocomplete="off" placeholder="Type a product name, format or task"><div id="yjr"></div></section><style>.yj-lgbar{position:absolute;top:14px;right:18px;display:flex;gap:6px;z-index:60}.yj-lg{font:600 12px/1 system-ui,sans-serif;padding:6px 9px;border-radius:4px;text-decoration:none;color:#8b96a3;border:1px solid rgba(140,150,165,.28)}.yj-lg:hover{color:#e8eaed;border-color:rgba(160,175,195,.6)}.yj-lg.on{color:#0e1116;background:#cfd6de;border-color:#cfd6de}.yj-find{max-width:760px;margin:34px auto 8px;padding:0 20px}.yj-find h2{font:600 20px/1.3 system-ui,sans-serif;margin:0 0 10px}#yjq{width:100%;box-sizing:border-box;padding:13px 15px;font:400 15.5px system-ui,sans-serif;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:rgba(255,255,255,.04);color:inherit}#yjq:focus{outline:none;border-color:#7FD1C4}#yjr{margin-top:10px;display:flex;flex-direction:column;gap:6px}#yjr a{display:flex;justify-content:space-between;gap:12px;padding:11px 14px;border:1px solid rgba(140,150,165,.22);border-radius:6px;text-decoration:none;font:400 14.5px/1.4 system-ui,sans-serif;color:inherit}#yjr a:hover{border-color:#7FD1C4}#yjr .pr{font:600 13px system-ui,sans-serif;color:#5fbf9a;white-space:nowrap}</style><script>(function(){var q=document.getElementById("yjq"),r=document.getElementById("yjr"),D=null;function load(){if(D)return Promise.resolve(D);return fetch("/search-index.json").then(function(x){return x.json();}).then(function(j){D=j;return j;}).catch(function(){D=[];return D;});}function esc(t){return String(t).replace(/[&<>"]/g,function(c){return {"&":"&","<":"<",">":">",'"':"""}[c];});}function run(){var v=q.value.trim().toLowerCase();if(v.length<2){r.innerHTML="";return;}load().then(function(j){var w=v.split(/\s+/),o=[];for(var i=0;i<j.length&&o.length<12;i++){var t=j[i].t.toLowerCase();var ok=true;for(var k=0;k<w.length;k++){if(t.indexOf(w[k])<0){ok=false;break;}}if(ok)o.push(j[i]);}r.innerHTML=o.length?o.map(function(x){return "<a href=\""+esc(x.u)+"\">"+"<span>"+esc(x.t)+"</span>"+(x.p?"<span class=\"pr\">$"+x.p+"</span>":"")+"</a>";}).join(""):"";});}q.addEventListener("input",run);q.addEventListener("focus",load);})();</script></div>
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<script data-yj="yj-view-beacon">(function(){try{var p=location.pathname;var k='yjv:'+p;if(sessionStorage.getItem(k))return;sessionStorage.setItem(k,'1');fetch('/api/ev',{method:'POST',keepalive:true,headers:{'Content-Type':'application/json'},body:JSON.stringify({path:p,lang:"en",ref:(document.referrer||''),src:(function(){try{return (new URLSearchParams(location.search).get('ref')||'').replace(/[^a-z_]/g,'').slice(0,12)}catch(e){return ''}})()})}).catch(function(){});}catch(e){}})();</script>
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<script data-yj="yj-use-beacon">(function(){try{var o=document.getElementById('out');if(!o)return;var p=location.pathname,k='yju:'+p,sent=false;function fire(){if(sent||sessionStorage.getItem(k))return;if(!(o.textContent||'').replace(/\s+/g,'').length)return;sent=true;sessionStorage.setItem(k,'1');fetch('/api/ev',{method:'POST',keepalive:true,headers:{'Content-Type':'application/json'},body:JSON.stringify({path:p,lang:"en",t:'use',src:(function(){try{return (new URLSearchParams(location.search).get('ref')||'').replace(/[^a-z_]/g,'').slice(0,12)}catch(e){return ''}})()})}).catch(function(){});}var mo=new MutationObserver(function(){fire();if(sent)mo.disconnect();});mo.observe(o,{childList:true,characterData:true,subtree:true});}catch(e){}})();</script>
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<section data-yj="yj-facts-v1" style="max-width:920px;margin:48px auto 0;padding:0 20px;font-family:system-ui,sans-serif"><style>.yj-article p{font:400 15.5px/1.7 system-ui,sans-serif;color:#26313b;margin:0 0 12px;max-width:72ch}.yj-article h2,.yj-article h3,.yj-article h4{font:600 17px/1.35 system-ui,sans-serif;color:#1b1f24;margin:22px 0 8px}.yj-article table{border-collapse:collapse;margin:10px 0 16px;font:14px/1.45 system-ui,sans-serif}.yj-article th,.yj-article td{border:1px solid #e2e6ea;padding:6px 10px;text-align:left}.yj-article th{background:#f4f6f8}.yj-article pre{background:#0f1720;color:#e6edf3;padding:12px 14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,Menlo,monospace}.yj-article code{font:13px ui-monospace,Menlo,monospace;background:#f1f3f5;padding:1px 4px;border-radius:3px}.yj-article pre code{background:none;padding:0}.yj-article ul,.yj-article ol{font:15px/1.6 system-ui,sans-serif;color:#26313b}</style><p style="font:400 13px/1.5 system-ui,sans-serif;color:#6b7680;margin:0 0 14px"><time datetime="2026-09-14">Updated 2026-09-14</time> · ReadyStack</p><script type="application/ld+json">{"@context":"https://schema.org","@type":"WebPage","dateModified":"2026-09-14","author":{"@type":"Organization","name":"ReadyStack"}}</script><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Worked example</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 16px;color:#5b6570">Real numbers from this tool, line by line.</p><div class="yj-article"><p><img src="https://getreadystack.com/img/promo/sku68909_result_card.jpg" alt="Postgres Migration Lock Lint" loading="lazy" style="max-width:100%;border-radius:6px"></p>
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<p>22 findings in a 20-statement migration. That is what a Rails engineer on a live orders table gets back from the file an assistant wrote in four seconds.</p>
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<p>The migration is unremarkable. Add a tenant_id column, tighten amount_cents to numeric(12,2), add a foreign key to tenants, add a unique constraint on external_ref, build an index on tenant_id, rename legacy_total, drop legacy_notes, backfill the new column, clear an events table. Twenty statements between BEGIN and COMMIT. Nothing in it is wrong SQL. Every statement runs. That is the problem: the lock behaviour is not in the text.</p>
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<p>Sixteen of the 22 findings are at error severity, meaning writes stop or the statement aborts outright. ALTER COLUMN amount_cents TYPE numeric(12,2) rewrites the whole table and every index on it while holding ACCESS EXCLUSIVE. CREATE INDEX without CONCURRENTLY holds SHARE, so reads continue and every INSERT, UPDATE and DELETE waits for the build. ADD CONSTRAINT ... FOREIGN KEY without NOT VALID takes ACCESS EXCLUSIVE on the child table and SHARE ROW EXCLUSIVE on the parent while it scans existing rows. ADD COLUMN tenant_id bigint NOT NULL with no default does not block at all - it fails, SQLSTATE 23502, because the table already has rows. And CREATE INDEX CONCURRENTLY, the correct form, aborts with 25001 when it is sitting inside the BEGIN/COMMIT the generator wrapped everything in.</p>
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<p>The finding that matters most is the one that is not a statement. There is no lock_timeout anywhere in the file. A DDL statement that cannot get its lock does not fail; it waits. And while it waits at the head of the lock queue, every query that arrives after it waits too, including the plain SELECTs that were perfectly compatible with whatever is already running. One analytics query holding a read lock plus one ALTER TABLE behind it is enough to make a healthy table unreadable. SET lock_timeout = '3s' turns that outage into a retry.</p>
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<p>Version matters and the text does not tell you the version. ADD COLUMN x int DEFAULT 0 rewrote the table on PostgreSQL 10 and has been instant since 11, so flagging it now is noise - the rule set leaves it alone. SET NOT NULL skips its table scan on 12 and later, but only when a validated CHECK (x IS NOT NULL) already exists, which generated migrations almost never add first. REINDEX CONCURRENTLY exists from 12. Advice written before those releases is still what most of this code is imitating. PostgreSQL 14 receives its final minor release in November 2026, so a lot of teams are writing their 14-to-17 upgrade migrations right now.</p>
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<p>The free tools each see one half of the problem. strong_migrations reads the Rails DSL and nothing else. squawk parses raw SQL and nothing else. Neither reads a Django operations list, where AddIndex, AlterField and a RunPython backfill inside an atomic migration carry exactly the same locks. Both run in CI, after the migration is already written, already committed, already in a pull request with three approvals.</p>
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<p>Postgres Migration Lock Lint reads the file in the editor. 36 rules, one message each, naming the lock mode, the SQLSTATE where there is one, and the rewrite. Raw .sql, Rails ActiveRecord::Migration, Django migrations.Migration. The same schema change, split so nothing blocks - constant default, CHECK NOT VALID then VALIDATE, unique index built CONCURRENTLY then attached USING INDEX, a batched backfill with a WHERE - returns zero findings.</p>
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<p>Free tier: the file you have open, all 36 rules. The same rules run in the browser on pasted text, with nothing uploaded, at getreadystack.com/tools/pg-migration-lock-lint.</p></div><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:30px 0 10px;color:#1b1f24">15 seconds — what it actually does</h2><video controls muted playsinline preload="none" poster="/img/promo/sku68909_result_card.jpg" style="width:100%;max-width:360px;border-radius:10px;display:block;margin:0 auto"><source src="/media/sku68909_short.mp4" type="video/mp4"></video><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does Postgres Migration Lock Lint actually do?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads a migration file and names every statement that takes a lock Postgres will not share, such as ACCESS EXCLUSIVE on a table rewrite or SHARE on a plain CREATE INDEX. 36 rules, PostgreSQL 12-17. On the bundled 20-statement sample migration it returns 22 findings, 16 of them at error severity; the hand-split version of the same schema change returns 0 findings.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is this for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Rails and Django engineers who deploy to a Postgres database that has real traffic, and anyone reviewing raw .sql migrations written by an assistant. It is aimed at the person who runs the deploy and gets paged when a table stops answering, not at a greenfield project where every table is empty.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why do free tools not cover this?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">strong_migrations reads only the Rails DSL, squawk reads only raw SQL, and both run in CI after the migration is already in a pull request. Neither reads a Django operations list. This runs on the file in your editor, across all three formats, before the branch exists, and it knows which forms became safe in PostgreSQL 11 and 12.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what needs the licence key?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Free: the migration file you have open, checked against all 36 rules, with the full message and the safe rewrite. No key, no limit on how often. The full version adds scope and ownership: every migration in the workspace in one pass, the review exported as Markdown or JSON for the change ticket, and an exit code for CI.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does the alternative cost?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Independent Postgres consultancies bill migration and lock review at $150 an hour and up, and an incident review costs more than that once on-call time is counted. This is $29 once,. The free tier covers the file you are editing right now at no cost at all.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why not just ask ChatGPT or another AI chat?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">A general AI chat answers from training data with a cutoff date, cannot read your repository and names no rule version. Postgres Migration Lint - locks and downtime (ALTER TABLE, C checks the file you open against 36 rules from a rule set dated 2026-09-20, and points at the exact line. For a filing, an audit or a client you need that dated result on your own files.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does Postgres Migration Lock Lint actually do?", "acceptedAnswer": {"@type": "Answer", "text": "It reads a migration file and names every statement that takes a lock Postgres will not share, such as ACCESS EXCLUSIVE on a table rewrite or SHARE on a plain CREATE INDEX. 36 rules, PostgreSQL 12-17. On the bundled 20-statement sample migration it returns 22 findings, 16 of them at error severity; the hand-split version of the same schema change returns 0 findings."}}, {"@type": "Question", "name": "Who is this for?", "acceptedAnswer": {"@type": "Answer", "text": "Rails and Django engineers who deploy to a Postgres database that has real traffic, and anyone reviewing raw .sql migrations written by an assistant. It is aimed at the person who runs the deploy and gets paged when a table stops answering, not at a greenfield project where every table is empty."}}, {"@type": "Question", "name": "Why do free tools not cover this?", "acceptedAnswer": {"@type": "Answer", "text": "strong_migrations reads only the Rails DSL, squawk reads only raw SQL, and both run in CI after the migration is already in a pull request. Neither reads a Django operations list. This runs on the file in your editor, across all three formats, before the branch exists, and it knows which forms became safe in PostgreSQL 11 and 12."}}, {"@type": "Question", "name": "What is free and what needs the licence key?", "acceptedAnswer": {"@type": "Answer", "text": "Free: the migration file you have open, checked against all 36 rules, with the full message and the safe rewrite. No key, no limit on how often. The full version adds scope and ownership: every migration in the workspace in one pass, the review exported as Markdown or JSON for the change ticket, and an exit code for CI."}}, {"@type": "Question", "name": "What does the alternative cost?", "acceptedAnswer": {"@type": "Answer", "text": "Independent Postgres consultancies bill migration and lock review at $150 an hour and up, and an incident review costs more than that once on-call time is counted. This is $29 once,. The free tier covers the file you are editing right now at no cost at all."}}, {"@type": "Question", "name": "Why not just ask ChatGPT or another AI chat?", "acceptedAnswer": {"@type": "Answer", "text": "A general AI chat answers from training data with a cutoff date, cannot read your repository and names no rule version. Postgres Migration Lint - locks and downtime (ALTER TABLE, C checks the file you open against 36 rules from a rule set dated 2026-09-20, and points at the exact line. For a filing, an audit or a client you need that dated result on your own files."}}]}</script><div id="yj-ask" style="margin:36px 0 0;padding:18px 18px 16px;border:1px solid #e2e6ea;border-radius:10px;background:#fbfbfc"><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:0 0 4px;color:#1b1f24">Ask about this tool</h2><p style="font:400 13.5px/1.5 system-ui,sans-serif;margin:0 0 12px;color:#5b6570">One question, answered by the person who built it. 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Answers land on this page and, if you left an email, in your inbox.";f.question.value="";}).catch(function(){m.style.color="#a8551f";m.textContent="Could not send. Please try again in a minute.";});return false;}</script></div></section><section class="yj-related" style="max-width:920px;margin:56px auto 40px;padding:0 20px"><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Same job, next tool</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 20px;color:#5b6570">Free in the browser. 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