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9.2 KiB
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250 lines
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9.2 KiB
HTML
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>History - Home Assistant</title>
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<meta name="author" content="Paulus Schoutsen">
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<meta name="description" content="Instructions how to enable history support for Home Assistant.">
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<meta name="viewport" content="width=device-width">
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<link rel="canonical" href="https://home-assistant.io/components/history/">
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<meta property="og:title" content="History">
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<meta property="og:site_name" content="Home Assistant">
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<meta property="og:url" content="https://home-assistant.io/components/history/">
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<meta property="og:description" content="Instructions how to enable history support for Home Assistant.">
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<meta name="twitter:title" content="History">
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<meta name="twitter:description" content="Instructions how to enable history support for Home Assistant.">
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<meta name="twitter:image" content="https://home-assistant.io/images/home-assistant-logo-2164x2164.png">
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<link href="/stylesheets/screen.css" media="screen, projection" rel="stylesheet">
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<span>Home Assistant</span>
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<li>
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<a>Getting started <i class="icon icon-caret-down"></i></a>
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<ul>
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<li><a href='/getting-started/'>Installing Home Assistant</a></li>
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<li><a href='/getting-started/configuration/'>Configuration Basics</a></li>
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<li><a href='/getting-started/devices/'>Adding devices</a></li>
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Creating Components
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<li><a href="/developers/add_new_platform/">
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Adding Platform Support
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<li><a href="/developers/api/">API</a></li>
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<article class="page">
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<header>
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<h1 class="title indent">
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History
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</h1>
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</header>
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<hr class="divider">
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<p>This component will track everything that is going on within Home Assistant and allows the user to browse through it.</p>
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<p>To enable the history option in your installation, add the following to your <code>configuration.yaml</code> file:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># Example configuration.yaml entry</span>
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<span class="key">history</span>:
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</pre></div>
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</div>
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</div>
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<p class="img">
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<a href="/images/screenshots/component_history_24h.png">
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<img src="/images/screenshots/component_history_24h.png" />
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</a>
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</p>
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<p class="note">
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Events are saved in a local database. Google Graphs is used to draw the graph. Drawing is happening 100% in your browser. No data is transferred to anyone at any time.
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</p>
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<h4><a class="title-link" name="implementation-details" href="#implementation-details"></a> Implementation details</h4>
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<p>The history is stored in a SQLite database <code>home-assistant.db</code> within your config directory.</p>
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<ul>
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<li>events table is all events except <code>time_changed</code> that happened while recorder component was running.</li>
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<li>states table contains all the <code>new_state</code> values of <code>state_changed</code> events.</li>
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<li>Inside the states table you have:
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<ul>
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<li><code>entity_id</code>: the entity_id of the entity</li>
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<li><code>state</code>: the state of the entity</li>
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<li><code>attributes</code>: JSON of the state attributes</li>
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<li><code>last_changed</code>: timestamp last time the state has changed. A state_changed event can happen when just attributes change.</li>
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<li><code>last_updated</code>: timestamp anything has changed (state, attributes)</li>
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<li><code>created</code>: timestamp this entry was inserted into the database</li>
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</ul>
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</li>
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</ul>
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<p>When the history component queries the states table it only selects states where the state has changed: <code>WHERE last_changed=last_updated</code></p>
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<h4><a class="title-link" name="on-dates" href="#on-dates"></a> On dates</h4>
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<p>SQLite databases do not support native dates. That’s why all the dates are saved in seconds since the UNIX epoch. Convert them manually using this site or in Python:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="keyword">from</span> <span class="include">datetime</span> <span class="keyword">import</span> <span class="include">datetime</span>
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datetime.fromtimestamp(<span class="integer">1422830502</span>)
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</pre></div>
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</div>
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</div>
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<h4><a class="title-link" name="api" href="#api"></a> API</h4>
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<p>The history information are also available through the <a href="/developers/rest_api/#get-apihistory">RESTful API</a>.</p>
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</article>
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</div>
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<aside id="sidebar" class="grid__item one-third lap-one-whole palm-one-whole">
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<div class="grid">
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<section class="aside-module grid__item one-whole lap-one-half">
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<div class='edit-github'><a href='https://github.com/balloob/home-assistant.io/tree/master/source/_components/history.markdown'>Edit this page on GitHub</a></div>
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<div class='brand-logo-container section'>
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<img src='/images/supported_brands/home-assistant.png' />
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</div>
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<div class='section'>
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<h1 class="title delta">Category History</h1>
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<ul class='divided'>
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<li>
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<a href='/components/graphite/'>Graphite</a>
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</li>
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<li>
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History
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</li>
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<li>
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<a href='/components/influxdb/'>InfluxDB</a>
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</li>
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<li>
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<a href='/components/logbook/'>Logbook</a>
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</li>
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<li>
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<a href='/components/splunk/'>Splunk</a>
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</li>
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<li>
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<a href='/components/statsd/'>StatsD</a>
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</li>
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</ul>
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</div>
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</section>
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<a rel="me" href='https://github.com/balloob/home-assistant'><i class="icon-github"></i></a>
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