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<h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/purge.ex#L1" title="View Source" class="icon-action" rel="help">
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<span class="sr-only">View Source</span>
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<span translate="no">Plausible.Purge</span>
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<small class="app-vsn" translate="no">(Plausible v0.0.1)</small>
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</h1>
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<section id="moduledoc">
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<p>Deletes data from a site.</p><p>Stats are stored on Clickhouse, and unlike other databases data deletion is
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done asynchronously.</p><p>All import tables have MergeTree's deduplication mechanism <em>disabled</em> by setting
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<code class="inline">replicated_deduplication_window</code> from default 100 to 0. When enabled, every insert
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into a given table is compared against hashes of 100 previous inserts (as complete
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parts, not concrete rows) and ignored when match is found. The prupose of that
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mechanism is making inserts of exact same batches idempotent when retrying them
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shortly after - for instance due to timeout, when the client can't easily tell if
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previous insert succeeded or not. Deduplication, however, only considers inserts,
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not mutations. Deletions do not affect stored hashes, so further inserts of parts
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that were deleted will still be treated as duplicates. That's why this feature
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is disabled for import tables.</p><p>Although deletions are asynchronous, the parts to delete are "remembered", so there's
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no risk of overlapping deletion causing problems with import following right after it.</p><p>IMPORTANT: Deletion requires revision if/when import tables get moved to sharded CH
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cluster setup. Mutation queries, which have to be run with <code class="inline">ON CLUSTER</code> in such setup,
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dispatch independent queries across shards and those queries can start at different
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times. This in turn means risk of deletions corrupting data of follow-up inserts
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in some edge cases. Ideally, imported entries should be unique for a given import</p><ul><li><p>an extra <code class="inline">import_id</code> column can be introduced, holding identifier. Last processed
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import identifier should be stored with other site data and should be used for scoping
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imported stats queries. No longer used imports can then be safely removed fully
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asynchronously.</p></li><li><p><a href="https://clickhouse.com/docs/en/sql-reference/statements/alter/delete">Clickhouse <code class="inline">ALTER TABLE ... DELETE</code> Statement</a></p></li><li><p><a href="https://clickhouse.com/docs/en/sql-reference/statements/alter/#synchronicity-of-alter-queries">Synchronicity of <code class="inline">ALTER</code> Queries</a></p></li></ul>
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</section>
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<section id="summary" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#summary">
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<i class="ri-link-m" aria-hidden="true"></i>
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</a>
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<span class="text">Summary</span>
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</h1>
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<div class="summary-functions summary">
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<h2>
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<a href="#functions">Functions</a>
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</h2>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#delete_imported_stats!/1" translate="no">delete_imported_stats!(site)</a>
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</div>
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<div class="summary-synopsis"><p>Deletes imported stats from Google Analytics, and clears the
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<code class="inline">stats_start_date</code> field.</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#delete_native_stats!/1" translate="no">delete_native_stats!(site)</a>
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</div>
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<div class="summary-synopsis"><p>Move stats pointers so that no historical stats are available.</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#reset!/1" translate="no">reset!(site)</a>
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</div>
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</div>
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</div>
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</section>
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<section id="functions" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#functions">
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<i class="ri-link-m" aria-hidden="true"></i>
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</a>
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<span class="text">Functions</span>
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</h1>
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<div class="functions-list">
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<section class="detail" id="delete_imported_stats!/1">
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<div class="detail-header">
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<a href="#delete_imported_stats!/1" class="detail-link" title="Link to this function">
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<span class="sr-only">Link to this function</span>
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</a>
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<h1 class="signature" translate="no">delete_imported_stats!(site)</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/purge.ex#L41" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@spec</span> delete_imported_stats!(<a href="Plausible.Site.html#t:t/0">Plausible.Site.t</a>()) :: :ok</pre>
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</div>
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<p>Deletes imported stats from Google Analytics, and clears the
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<code class="inline">stats_start_date</code> field.</p>
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</section>
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</section>
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<section class="detail" id="delete_native_stats!/1">
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<span class="sr-only">Link to this function</span>
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</a>
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<h1 class="signature" translate="no">delete_native_stats!(site)</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/purge.ex#L56" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@spec</span> delete_native_stats!(<a href="Plausible.Site.html#t:t/0">Plausible.Site.t</a>()) :: :ok</pre>
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</div>
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<p>Move stats pointers so that no historical stats are available.</p>
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</section>
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</section>
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<section class="detail" id="reset!/1">
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<a href="#reset!/1" class="detail-link" title="Link to this function">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this function</span>
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</a>
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<h1 class="signature" translate="no">reset!(site)</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/purge.ex#L62" class="icon-action" rel="help" title="View Source">
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