<p></p>
<p dir="auto">For the <code class="notranslate">timestamp(6)</code> on <code class="notranslate">ar_internal_metadata</code>, the structure.sql should continue to use <code class="notranslate">timestamp(6)</code>.</p>
<p dir="auto">This is because for rails 6.0+, timestamp(6) is the default for timestamp columns. (<a href="https://github.com/rails/rails/blob/87c42b2c4f0cd287323eae4c3e0e2f47a7635585/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb#L1824">default</a> vs <a href="https://github.com/rails/rails/blob/87c42b2c4f0cd287323eae4c3e0e2f47a7635585/activerecord/lib/active_record/migration/compatibility.rb#L255-L258">override for old versions</a>) All of our migrations are correctly labelled with which AR version to use, so tables before that are defined with <code class="notranslate">timestamp</code>, tables after that with <code class="notranslate">timestamp(6)</code>.</p>
<p dir="auto">The edge case is that <code class="notranslate">ar_internal_metadata</code> table is not controlled, so gets the defaults at the moment it was created, which varies from system to system. On my laptop that was before rails 6, so I have <code class="notranslate">timestamp</code>. Any developer who first ran the code after <a href="https://github.com/openstreetmap/openstreetmap-website/commit/22cd2314e52373d8fbe84a082c3ed058dfea8d40">November 2019</a> will have <code class="notranslate">timestamp(6)</code>.</p>
<p dir="auto">I've updated my development machine, by running:</p>
<pre class="notranslate"><code class="notranslate">alter table ar_internal_metadata alter column created_at set data type timestamp(6) without time zone;
alter table ar_internal_metadata alter column updated_at set data type timestamp(6) without time zone;
</code></pre>
<p dir="auto">I would encourage any other veteran developers to run the same update, to avoid noise when working on database migrations.</p>

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