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href="/hass.tibber_prices/developer/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">🏗️ Architecture</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Caching Strategy</span></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next 🚧</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Caching Strategy</h1></header>
<p>This document explains all caching mechanisms in the Tibber Prices integration, their purpose, invalidation logic, and lifetime.</p>
<p>For timer coordination and scheduling details, see <a class="" href="/hass.tibber_prices/developer/timer-architecture">Timer Architecture</a>.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="overview">Overview<a href="#overview" class="hash-link" aria-label="Direct link to Overview" title="Direct link to Overview" translate="no">​</a></h2>
<p>The integration uses <strong>4 distinct caching layers</strong> with different purposes and lifetimes:</p>
<ol>
<li class=""><strong>Persistent API Data Cache</strong> (HA Storage) - Hours to days</li>
<li class=""><strong>Translation Cache</strong> (Memory) - Forever (until HA restart)</li>
<li class=""><strong>Config Dictionary Cache</strong> (Memory) - Until config changes</li>
<li class=""><strong>Period Calculation Cache</strong> (Memory) - Until price data or config changes</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="1-persistent-api-data-cache">1. Persistent API Data Cache<a href="#1-persistent-api-data-cache" class="hash-link" aria-label="Direct link to 1. Persistent API Data Cache" title="Direct link to 1. Persistent API Data Cache" translate="no">​</a></h2>
<p><strong>Location:</strong> <code>coordinator/cache.py</code> → HA Storage (<code>.storage/tibber_prices.&lt;entry_id&gt;</code>)</p>
<p><strong>Purpose:</strong> Reduce API calls to Tibber by caching user data and price data between HA restarts.</p>
<p><strong>What is cached:</strong></p>
<ul>
<li class=""><strong>Price data</strong> (<code>price_data</code>): Day before yesterday/yesterday/today/tomorrow price intervals with enriched fields (384 intervals total)</li>
<li class=""><strong>User data</strong> (<code>user_data</code>): Homes, subscriptions, features from Tibber GraphQL <code>viewer</code> query</li>
<li class=""><strong>Timestamps</strong>: Last update times for validation</li>
</ul>
<p><strong>Lifetime:</strong></p>
<ul>
<li class=""><strong>Price data</strong>: Until midnight turnover (cleared daily at 00:00 local time)</li>
<li class=""><strong>User data</strong>: 24 hours (refreshed daily)</li>
<li class=""><strong>Survives</strong>: HA restarts via persistent Storage</li>
</ul>
<p><strong>Invalidation triggers:</strong></p>
<ol>
<li class="">
<p><strong>Midnight turnover</strong> (Timer #2 in coordinator):</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># coordinator/day_transitions.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">_handle_midnight_turnover</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_cached_price_data </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Force fresh fetch for new day</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_last_price_update </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">store_cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre></div></div>
</li>
<li class="">
<p><strong>Cache validation on load</strong>:</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># coordinator/cache.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">is_cache_valid</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">cache_data</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> CacheData</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token builtin">bool</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Checks if price data is from a previous day</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">if</span><span class="token plain"> today_date </span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain"> local_now</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">date</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Yesterday&#x27;s data</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">return</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">False</span><br></span></code></pre></div></div>
</li>
<li class="">
<p><strong>Tomorrow data check</strong> (after 13:00):</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># coordinator/data_fetching.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">if</span><span class="token plain"> tomorrow_missing </span><span class="token keyword" style="color:#00009f">or</span><span class="token plain"> tomorrow_invalid</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">return</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;tomorrow_check&quot;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Update needed</span><br></span></code></pre></div></div>
</li>
</ol>
<p><strong>Why this cache matters:</strong> Reduces API load on Tibber (~192 intervals per fetch), speeds up HA restarts, enables offline operation until cache expires.</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="2-translation-cache">2. Translation Cache<a href="#2-translation-cache" class="hash-link" aria-label="Direct link to 2. Translation Cache" title="Direct link to 2. Translation Cache" translate="no">​</a></h2>
<p><strong>Location:</strong> <code>const.py</code> → <code>_TRANSLATIONS_CACHE</code> and <code>_STANDARD_TRANSLATIONS_CACHE</code> (in-memory dicts)</p>
<p><strong>Purpose:</strong> Avoid repeated file I/O when accessing entity descriptions, UI strings, etc.</p>
<p><strong>What is cached:</strong></p>
<ul>
<li class=""><strong>Standard translations</strong> (<code>/translations/*.json</code>): Config flow, selector options, entity names</li>
<li class=""><strong>Custom translations</strong> (<code>/custom_translations/*.json</code>): Entity descriptions, usage tips, long descriptions</li>
</ul>
<p><strong>Lifetime:</strong></p>
<ul>
<li class=""><strong>Forever</strong> (until HA restart)</li>
<li class="">No invalidation during runtime</li>
</ul>
<p><strong>When populated:</strong></p>
<ul>
<li class="">At integration setup: <code>async_load_translations(hass, &quot;en&quot;)</code> in <code>__init__.py</code></li>
<li class="">Lazy loading: If translation missing, attempts file load once</li>
</ul>
<p><strong>Access pattern:</strong></p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># Non-blocking synchronous access from cached data</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">description </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> get_translation</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&quot;binary_sensor.best_price_period.description&quot;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;en&quot;</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre></div></div>
<p><strong>Why this cache matters:</strong> Entity attributes are accessed on every state update (~15 times per hour per entity). File I/O would block the event loop. Cache enables synchronous, non-blocking attribute generation.</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="3-config-dictionary-cache">3. Config Dictionary Cache<a href="#3-config-dictionary-cache" class="hash-link" aria-label="Direct link to 3. Config Dictionary Cache" title="Direct link to 3. Config Dictionary Cache" translate="no">​</a></h2>
<p><strong>Location:</strong> <code>coordinator/data_transformation.py</code> and <code>coordinator/periods.py</code> (per-instance fields)</p>
<p><strong>Purpose:</strong> Avoid ~30-40 <code>options.get()</code> calls on every coordinator update (every 15 minutes).</p>
<p><strong>What is cached:</strong></p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="datatransformer-config-cache">DataTransformer Config Cache<a href="#datatransformer-config-cache" class="hash-link" aria-label="Direct link to DataTransformer Config Cache" title="Direct link to DataTransformer Config Cache" translate="no">​</a></h3>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;thresholds&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">&quot;low&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">15</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;high&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">35</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;volatility_thresholds&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">&quot;moderate&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">15.0</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;high&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">25.0</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;very_high&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">40.0</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># ... 20+ more config fields</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre></div></div>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="periodcalculator-config-cache">PeriodCalculator Config Cache<a href="#periodcalculator-config-cache" class="hash-link" aria-label="Direct link to PeriodCalculator Config Cache" title="Direct link to PeriodCalculator Config Cache" translate="no">​</a></h3>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;best&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">&quot;flex&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.15</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;min_distance_from_avg&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5.0</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;min_period_length&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">60</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;peak&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">&quot;flex&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">0.15</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;min_distance_from_avg&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5.0</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;min_period_length&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">60</span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre></div></div>
<p><strong>Lifetime:</strong></p>
<ul>
<li class="">Until <code>invalidate_config_cache()</code> is called</li>
<li class="">Built once on first use per coordinator update cycle</li>
</ul>
<p><strong>Invalidation trigger:</strong></p>
<ul>
<li class=""><strong>Options change</strong> (user reconfigures integration):<!-- -->
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># coordinator/core.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">async</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">_handle_options_update</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_data_transformer</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">invalidate_config_cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_period_calculator</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">invalidate_config_cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">async_request_refresh</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre></div></div>
</li>
</ul>
<p><strong>Performance impact:</strong></p>
<ul>
<li class=""><strong>Before:</strong> ~30 dict lookups + type conversions per update = ~50μs</li>
<li class=""><strong>After:</strong> 1 cache check = ~1μs</li>
<li class=""><strong>Savings:</strong> ~98% (50μs → 1μs per update)</li>
</ul>
<p><strong>Why this cache matters:</strong> Config is read multiple times per update (transformation + period calculation + validation). Caching eliminates redundant lookups without changing behavior.</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="4-period-calculation-cache">4. Period Calculation Cache<a href="#4-period-calculation-cache" class="hash-link" aria-label="Direct link to 4. Period Calculation Cache" title="Direct link to 4. Period Calculation Cache" translate="no">​</a></h2>
<p><strong>Location:</strong> <code>coordinator/periods.py</code> → <code>PeriodCalculator._cached_periods</code></p>
<p><strong>Purpose:</strong> Avoid expensive period calculations (~100-500ms) when price data and config haven&#x27;t changed.</p>
<p><strong>What is cached:</strong></p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;best_price&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;periods&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">[</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Calculated period objects</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;intervals&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">[</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># All intervals in periods</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;metadata&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Config snapshot</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;best_price_relaxation&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token string" style="color:#e3116c">&quot;relaxation_active&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">bool</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;peak_price&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;peak_price_relaxation&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre></div></div>
<p><strong>Cache key:</strong> Hash of relevant inputs</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">hash_data </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> today_signature</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># (startsAt, rating_level) for each interval</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token builtin">tuple</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">best_config</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">items</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Best price config</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token builtin">tuple</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">peak_config</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">items</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Peak price config</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> best_level_filter</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Level filter overrides</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> peak_level_filter</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre></div></div>
<p><strong>Lifetime:</strong></p>
<ul>
<li class="">Until price data changes (today&#x27;s intervals modified)</li>
<li class="">Until config changes (flex, thresholds, filters)</li>
<li class="">Recalculated at midnight (new today data)</li>
</ul>
<p><strong>Invalidation triggers:</strong></p>
<ol>
<li class="">
<p><strong>Config change</strong> (explicit):</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">invalidate_config_cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_cached_periods </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_last_periods_hash </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">None</span><br></span></code></pre></div></div>
</li>
<li class="">
<p><strong>Price data change</strong> (automatic via hash mismatch):</p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">current_hash </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_compute_periods_hash</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">price_info</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">if</span><span class="token plain"> self</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">_last_periods_hash </span><span class="token operator" style="color:#393A34">!=</span><span class="token plain"> current_hash</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Cache miss - recalculate</span><br></span></code></pre></div></div>
</li>
</ol>
<p><strong>Cache hit rate:</strong></p>
<ul>
<li class=""><strong>High:</strong> During normal operation (coordinator updates every 15min, price data unchanged)</li>
<li class=""><strong>Low:</strong> After midnight (new today data) or when tomorrow data arrives (~13:00-14:00)</li>
</ul>
<p><strong>Performance impact:</strong></p>
<ul>
<li class=""><strong>Period calculation:</strong> ~100-500ms (depends on interval count, relaxation attempts)</li>
<li class=""><strong>Cache hit:</strong> <code>&lt;</code>1ms (hash comparison + dict lookup)</li>
<li class=""><strong>Savings:</strong> ~70% of calculation time (most updates hit cache)</li>
</ul>
<p><strong>Why this cache matters:</strong> Period calculation is CPU-intensive (filtering, gap tolerance, relaxation). Caching avoids recalculating unchanged periods 3-4 times per hour.</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="5-transformation-cache-price-enrichment-only">5. Transformation Cache (Price Enrichment Only)<a href="#5-transformation-cache-price-enrichment-only" class="hash-link" aria-label="Direct link to 5. Transformation Cache (Price Enrichment Only)" title="Direct link to 5. Transformation Cache (Price Enrichment Only)" translate="no">​</a></h2>
<p><strong>Location:</strong> <code>coordinator/data_transformation.py</code> → <code>_cached_transformed_data</code></p>
<p><strong>Status:</strong> ✅ <strong>Clean separation</strong> - enrichment only, no redundancy</p>
<p><strong>What is cached:</strong></p>
<div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;timestamp&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;homes&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">&quot;priceInfo&quot;</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># Enriched price data (trailing_avg_24h, difference, rating_level)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># NO periods - periods are exclusively managed by PeriodCalculator</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre></div></div>
<p><strong>Purpose:</strong> Avoid re-enriching price data when config unchanged between midnight checks.</p>
<p><strong>Current behavior:</strong></p>
<ul>
<li class="">Caches <strong>only enriched price data</strong> (price + statistics)</li>
<li class=""><strong>Does NOT cache periods</strong> (handled by Period Calculation Cache)</li>
<li class="">Invalidated when:<!-- -->
<ul>
<li class="">Config changes (thresholds affect enrichment)</li>
<li class="">Midnight turnover detected</li>
<li class="">New update cycle begins</li>
</ul>
</li>
</ul>
<p><strong>Architecture:</strong></p>
<ul>
<li class="">DataTransformer: Handles price enrichment only</li>
<li class="">PeriodCalculator: Handles period calculation only (with hash-based cache)</li>
<li class="">Coordinator: Assembles final data on-demand from both caches</li>
</ul>
<p><strong>Memory savings:</strong> Eliminating redundant period storage saves ~10KB per coordinator (14% reduction).</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="cache-invalidation-flow">Cache Invalidation Flow<a href="#cache-invalidation-flow" class="hash-link" aria-label="Direct link to Cache Invalidation Flow" title="Direct link to Cache Invalidation Flow" translate="no">​</a></h2>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="user-changes-options-config-flow">User Changes Options (Config Flow)<a href="#user-changes-options-config-flow" class="hash-link" aria-label="Direct link to User Changes Options (Config Flow)" title="Direct link to User Changes Options (Config Flow)" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">User saves options</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">config_entry.add_update_listener() triggers</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">coordinator._handle_options_update()</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; DataTransformer.invalidate_config_cache()</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ └─&gt; _config_cache = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ _config_cache_valid = False</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ _cached_transformed_data = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">└─&gt; PeriodCalculator.invalidate_config_cache()</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> └─&gt; _config_cache = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> _config_cache_valid = False</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> _cached_periods = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> _last_periods_hash = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">coordinator.async_request_refresh()</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Fresh data fetch with new config</span><br></span></code></pre></div></div>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="midnight-turnover-day-transition">Midnight Turnover (Day Transition)<a href="#midnight-turnover-day-transition" class="hash-link" aria-label="Direct link to Midnight Turnover (Day Transition)" title="Direct link to Midnight Turnover (Day Transition)" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Timer #2 fires at 00:00</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">coordinator._handle_midnight_turnover()</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Clear persistent cache</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ └─&gt; _cached_price_data = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ _last_price_update = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">└─&gt; Clear transformation cache</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> └─&gt; _cached_transformed_data = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> _last_transformation_config = None</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Period cache auto-invalidates (hash mismatch on new &quot;today&quot;)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Fresh API fetch for new day</span><br></span></code></pre></div></div>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="tomorrow-data-arrives-1300">Tomorrow Data Arrives (~13:00)<a href="#tomorrow-data-arrives-1300" class="hash-link" aria-label="Direct link to Tomorrow Data Arrives (~13:00)" title="Direct link to Tomorrow Data Arrives (~13:00)" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Coordinator update cycle</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">should_update_price_data() checks tomorrow</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Tomorrow data missing/invalid</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">API fetch with new tomorrow data</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Price data hash changes (new intervals)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Period cache auto-invalidates (hash mismatch)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Periods recalculated with tomorrow included</span><br></span></code></pre></div></div>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="cache-coordination">Cache Coordination<a href="#cache-coordination" class="hash-link" aria-label="Direct link to Cache Coordination" title="Direct link to Cache Coordination" translate="no">​</a></h2>
<p><strong>All caches work together:</strong></p>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Persistent Storage (HA restart)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">API Data Cache (price_data, user_data)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ├─&gt; Enrichment (add rating_level, difference, etc.)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> │ ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> │ Transformation Cache (_cached_transformed_data)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> └─&gt; Period Calculation</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Period Cache (_cached_periods)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Config Cache (avoid re-reading options)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ↓</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Translation Cache (entity descriptions)</span><br></span></code></pre></div></div>
<p><strong>No cache invalidation cascades:</strong></p>
<ul>
<li class="">Config cache invalidation is <strong>explicit</strong> (on options update)</li>
<li class="">Period cache invalidation is <strong>automatic</strong> (via hash mismatch)</li>
<li class="">Transformation cache invalidation is <strong>automatic</strong> (on midnight/config change)</li>
<li class="">Translation cache is <strong>never invalidated</strong> (read-only after load)</li>
</ul>
<p><strong>Thread safety:</strong></p>
<ul>
<li class="">All caches are accessed from <code>MainThread</code> only (Home Assistant event loop)</li>
<li class="">No locking needed (single-threaded execution model)</li>
</ul>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="performance-characteristics">Performance Characteristics<a href="#performance-characteristics" class="hash-link" aria-label="Direct link to Performance Characteristics" title="Direct link to Performance Characteristics" translate="no">​</a></h2>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="typical-operation-no-changes">Typical Operation (No Changes)<a href="#typical-operation-no-changes" class="hash-link" aria-label="Direct link to Typical Operation (No Changes)" title="Direct link to Typical Operation (No Changes)" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Coordinator Update (every 15 min)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; API fetch: SKIP (cache valid)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Config dict build: ~1μs (cached)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Period calculation: ~1ms (cached, hash match)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Transformation: ~10ms (enrichment only, periods cached)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">└─&gt; Entity updates: ~5ms (translation cache hit)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Total: ~16ms (down from ~600ms without caching)</span><br></span></code></pre></div></div>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="after-midnight-turnover">After Midnight Turnover<a href="#after-midnight-turnover" class="hash-link" aria-label="Direct link to After Midnight Turnover" title="Direct link to After Midnight Turnover" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Coordinator Update (00:00)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; API fetch: ~500ms (cache cleared, fetch new day)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Config dict build: ~50μs (rebuild, no cache)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Period calculation: ~200ms (cache miss, recalculate)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Transformation: ~50ms (re-enrich, rebuild)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">└─&gt; Entity updates: ~5ms (translation cache still valid)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Total: ~755ms (expected once per day)</span><br></span></code></pre></div></div>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="after-config-change">After Config Change<a href="#after-config-change" class="hash-link" aria-label="Direct link to After Config Change" title="Direct link to After Config Change" translate="no">​</a></h3>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">Options Update</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Cache invalidation: `&lt;`1ms</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">├─&gt; Coordinator refresh: ~600ms</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ ├─&gt; API fetch: SKIP (data unchanged)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ ├─&gt; Config rebuild: ~50μs</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ ├─&gt; Period recalculation: ~200ms (new thresholds)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ ├─&gt; Re-enrichment: ~50ms</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">│ └─&gt; Entity updates: ~5ms</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">└─&gt; Total: ~600ms (expected on manual reconfiguration)</span><br></span></code></pre></div></div>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="summary-table">Summary Table<a href="#summary-table" class="hash-link" aria-label="Direct link to Summary Table" title="Direct link to Summary Table" translate="no">​</a></h2>
<table><thead><tr><th>Cache Type</th><th>Lifetime</th><th>Size</th><th>Invalidation</th><th>Purpose</th></tr></thead><tbody><tr><td><strong>API Data</strong></td><td>Hours to 1 day</td><td>~50KB</td><td>Midnight, validation</td><td>Reduce API calls</td></tr><tr><td><strong>Translations</strong></td><td>Forever (until HA restart)</td><td>~5KB</td><td>Never</td><td>Avoid file I/O</td></tr><tr><td><strong>Config Dicts</strong></td><td>Until options change</td><td><code>&lt;</code>1KB</td><td>Explicit (options update)</td><td>Avoid dict lookups</td></tr><tr><td><strong>Period Calculation</strong></td><td>Until data/config change</td><td>~10KB</td><td>Auto (hash mismatch)</td><td>Avoid CPU-intensive calculation</td></tr><tr><td><strong>Transformation</strong></td><td>Until midnight/config change</td><td>~50KB</td><td>Auto (midnight/config)</td><td>Avoid re-enrichment</td></tr></tbody></table>
<p><strong>Total memory overhead:</strong> ~116KB per coordinator instance (main + subentries)</p>
<p><strong>Benefits:</strong></p>
<ul>
<li class="">97% reduction in API calls (from every 15min to once per day)</li>
<li class="">70% reduction in period calculation time (cache hits during normal operation)</li>
<li class="">98% reduction in config access time (30+ lookups → 1 cache check)</li>
<li class="">Zero file I/O during runtime (translations cached at startup)</li>
</ul>
<p><strong>Trade-offs:</strong></p>
<ul>
<li class="">Memory usage: ~116KB per home (negligible for modern systems)</li>
<li class="">Code complexity: 5 cache invalidation points (well-tested, documented)</li>
<li class="">Debugging: Must understand cache lifetime when investigating stale data issues</li>
</ul>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="debugging-cache-issues">Debugging Cache Issues<a href="#debugging-cache-issues" class="hash-link" aria-label="Direct link to Debugging Cache Issues" title="Direct link to Debugging Cache Issues" translate="no">​</a></h2>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="symptom-stale-data-after-config-change">Symptom: Stale data after config change<a href="#symptom-stale-data-after-config-change" class="hash-link" aria-label="Direct link to Symptom: Stale data after config change" title="Direct link to Symptom: Stale data after config change" translate="no">​</a></h3>
<p><strong>Check:</strong></p>
<ol>
<li class="">Is <code>_handle_options_update()</code> called? (should see &quot;Options updated&quot; log)</li>
<li class="">Are <code>invalidate_config_cache()</code> methods executed?</li>
<li class="">Does <code>async_request_refresh()</code> trigger?</li>
</ol>
<p><strong>Fix:</strong> Ensure <code>config_entry.add_update_listener()</code> is registered in coordinator init.</p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="symptom-period-calculation-not-updating">Symptom: Period calculation not updating<a href="#symptom-period-calculation-not-updating" class="hash-link" aria-label="Direct link to Symptom: Period calculation not updating" title="Direct link to Symptom: Period calculation not updating" translate="no">​</a></h3>
<p><strong>Check:</strong></p>
<ol>
<li class="">Verify hash changes when data changes: <code>_compute_periods_hash()</code></li>
<li class="">Check <code>_last_periods_hash</code> vs <code>current_hash</code></li>
<li class="">Look for &quot;Using cached period calculation&quot; vs &quot;Calculating periods&quot; logs</li>
</ol>
<p><strong>Fix:</strong> Hash function may not include all relevant data. Review <code>_compute_periods_hash()</code> inputs.</p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="symptom-yesterdays-prices-shown-as-today">Symptom: Yesterday&#x27;s prices shown as today<a href="#symptom-yesterdays-prices-shown-as-today" class="hash-link" aria-label="Direct link to Symptom: Yesterday&#x27;s prices shown as today" title="Direct link to Symptom: Yesterday&#x27;s prices shown as today" translate="no">​</a></h3>
<p><strong>Check:</strong></p>
<ol>
<li class=""><code>is_cache_valid()</code> logic in <code>coordinator/cache.py</code></li>
<li class="">Midnight turnover execution (Timer #2)</li>
<li class="">Cache clear confirmation in logs</li>
</ol>
<p><strong>Fix:</strong> Timer may not be firing. Check <code>_schedule_midnight_turnover()</code> registration.</p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="symptom-missing-translations">Symptom: Missing translations<a href="#symptom-missing-translations" class="hash-link" aria-label="Direct link to Symptom: Missing translations" title="Direct link to Symptom: Missing translations" translate="no">​</a></h3>
<p><strong>Check:</strong></p>
<ol>
<li class=""><code>async_load_translations()</code> called at startup?</li>
<li class="">Translation files exist in <code>/translations/</code> and <code>/custom_translations/</code>?</li>
<li class="">Cache population: <code>_TRANSLATIONS_CACHE</code> keys</li>
</ol>
<p><strong>Fix:</strong> Re-install integration or restart HA to reload translation files.</p>
<hr>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="related-documentation">Related Documentation<a href="#related-documentation" class="hash-link" aria-label="Direct link to Related Documentation" title="Direct link to Related Documentation" translate="no">​</a></h2>
<ul>
<li class=""><strong><a class="" href="/hass.tibber_prices/developer/timer-architecture">Timer Architecture</a></strong> - Timer system, scheduling, midnight coordination</li>
<li class=""><strong><a class="" href="/hass.tibber_prices/developer/architecture">Architecture</a></strong> - Overall system design, data flow</li>
<li class=""><strong><a href="https://github.com/jpawlowski/hass.tibber_prices/blob/v0.20.0/AGENTS.md" target="_blank" rel="noopener noreferrer" class="">AGENTS.md</a></strong> - Complete reference for AI development</li>
</ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col noPrint_WFHX"><a href="https://github.com/jpawlowski/hass.tibber_prices/tree/main/docs/developer/docs/caching-strategy.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2025-12-06T01:37:06.000Z" itemprop="dateModified">Dec 6, 2025</time></b></span></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/hass.tibber_prices/developer/timer-architecture"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Timer Architecture</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/hass.tibber_prices/developer/api-reference"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">API Reference</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#overview" class="table-of-contents__link toc-highlight">Overview</a></li><li><a href="#1-persistent-api-data-cache" class="table-of-contents__link toc-highlight">1. Persistent API Data Cache</a></li><li><a href="#2-translation-cache" class="table-of-contents__link toc-highlight">2. Translation Cache</a></li><li><a href="#3-config-dictionary-cache" class="table-of-contents__link toc-highlight">3. Config Dictionary Cache</a><ul><li><a href="#datatransformer-config-cache" class="table-of-contents__link toc-highlight">DataTransformer Config Cache</a></li><li><a href="#periodcalculator-config-cache" class="table-of-contents__link toc-highlight">PeriodCalculator Config Cache</a></li></ul></li><li><a href="#4-period-calculation-cache" class="table-of-contents__link toc-highlight">4. Period Calculation Cache</a></li><li><a href="#5-transformation-cache-price-enrichment-only" class="table-of-contents__link toc-highlight">5. Transformation Cache (Price Enrichment Only)</a></li><li><a href="#cache-invalidation-flow" class="table-of-contents__link toc-highlight">Cache Invalidation Flow</a><ul><li><a href="#user-changes-options-config-flow" class="table-of-contents__link toc-highlight">User Changes Options (Config Flow)</a></li><li><a href="#midnight-turnover-day-transition" class="table-of-contents__link toc-highlight">Midnight Turnover (Day Transition)</a></li><li><a href="#tomorrow-data-arrives-1300" class="table-of-contents__link toc-highlight">Tomorrow Data Arrives (~13:00)</a></li></ul></li><li><a href="#cache-coordination" class="table-of-contents__link toc-highlight">Cache Coordination</a></li><li><a href="#performance-characteristics" class="table-of-contents__link toc-highlight">Performance Characteristics</a><ul><li><a href="#typical-operation-no-changes" class="table-of-contents__link toc-highlight">Typical Operation (No Changes)</a></li><li><a href="#after-midnight-turnover" class="table-of-contents__link toc-highlight">After Midnight Turnover</a></li><li><a href="#after-config-change" class="table-of-contents__link toc-highlight">After Config Change</a></li></ul></li><li><a href="#summary-table" class="table-of-contents__link toc-highlight">Summary Table</a></li><li><a href="#debugging-cache-issues" class="table-of-contents__link toc-highlight">Debugging Cache Issues</a><ul><li><a href="#symptom-stale-data-after-config-change" class="table-of-contents__link toc-highlight">Symptom: Stale data after config change</a></li><li><a href="#symptom-period-calculation-not-updating" class="table-of-contents__link toc-highlight">Symptom: Period calculation not updating</a></li><li><a href="#symptom-yesterdays-prices-shown-as-today" class="table-of-contents__link toc-highlight">Symptom: Yesterday&#39;s prices shown as today</a></li><li><a href="#symptom-missing-translations" class="table-of-contents__link toc-highlight">Symptom: Missing translations</a></li></ul></li><li><a href="#related-documentation" class="table-of-contents__link toc-highlight">Related Documentation</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title">Documentation</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://jpawlowski.github.io/hass.tibber_prices/user/" target="_blank" rel="noopener noreferrer" class="footer__link-item">User Guide<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a class="footer__link-item" href="/hass.tibber_prices/developer/intro">Developer Guide</a></li></ul></div><div class="theme-layout-footer-column col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/jpawlowski/hass.tibber_prices/issues" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub Issues<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://community.home-assistant.io/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Home Assistant Community<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li></ul></div><div class="theme-layout-footer-column col footer__col"><div class="footer__title">More</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/jpawlowski/hass.tibber_prices" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://github.com/jpawlowski/hass.tibber_prices/releases" target="_blank" rel="noopener noreferrer" class="footer__link-item">Release Notes<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Not affiliated with Tibber AS. 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