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Data retention
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<h1 id="data-retention">Data retention</h1>
<p>The bot stores data in a SQLite database for the web viewer, stats, repeater management, and path routing. To limit database size, <strong>data retention</strong> controls how long rows are kept. Cleanup runs <strong>daily</strong> from the bot’s APScheduler-based maintenance loop, so retention is enforced even when the standalone web viewer is not running.</p>
<h2 id="configuration">Configuration</h2>
<p>All retention options live in the <strong><code>[Data_Retention]</code></strong> section of <code>config.ini</code>. Example (see <code>config.ini.example</code> for full comments):</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="k">[Data_Retention]</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="na">packet_stream_retention_days</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">3</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="na">daily_stats_retention_days</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">90</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="na">observed_paths_retention_days</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">90</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="na">purging_log_retention_days</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">90</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="na">mesh_connections_retention_days</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">7</span>
</code></pre></div>
<p>Stats tables (message_stats, command_stats, path_stats) use <strong><code>[Stats_Command]</code></strong> <code>data_retention_days</code> (default 7); the scheduler runs that cleanup daily as well. Stats are <strong>collected</strong> by default with <strong><code>collect_stats = true</code></strong> under <code>[Stats_Command]</code>, even if the user-facing <code>stats</code> chat command is disabled with <code>enabled = false</code>. Set <strong><code>collect_stats = false</code></strong> only if you want to stop writing those dashboard stats tables.</p>
<h2 id="tables-and-defaults">Tables and defaults</h2>
<table>
<thead>
<tr>
<th>Table / data</th>
<th>Purpose</th>
<th>Default retention</th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>packet_stream</strong></td>
<td>Real-time packets, commands, routing in the web viewer; transmission_tracker repeat counts</td>
<td>3 days</td>
</tr>
<tr>
<td><strong>daily_stats</strong></td>
<td>Daily repeater/advert stats</td>
<td>90 days</td>
</tr>
<tr>
<td><strong>unique_advert_packets</strong></td>
<td>Unique packet hashes for advert stats</td>
<td>90 days (same as daily_stats)</td>
</tr>
<tr>
<td><strong>observed_paths</strong></td>
<td>Path strings from adverts and messages</td>
<td>90 days</td>
</tr>
<tr>
<td><strong>purging_log</strong></td>
<td>Audit trail for repeater purges</td>
<td>90 days</td>
</tr>
<tr>
<td><strong>mesh_connections</strong></td>
<td>Path graph edges (in-memory + DB); should be ≥ Path_Command <code>graph_edge_expiration_days</code></td>
<td>7 days</td>
</tr>
<tr>
<td><strong>message_stats, command_stats, path_stats</strong></td>
<td>Stats command data</td>
<td>7 days (<code>[Stats_Command]</code> <code>data_retention_days</code>)</td>
</tr>
<tr>
<td><strong>daily_rollup</strong></td>
<td>Per-day dashboard rollups, so trends outlive the tables above</td>
<td>400 days (<code>[Web_Viewer]</code> <code>dashboard_snapshot_history_days</code>)</td>
</tr>
<tr>
<td><strong>dashboard_snapshot</strong></td>
<td>Single-row current-state payload for the dashboard</td>
<td>Overwritten in place</td>
</tr>
<tr>
<td><strong>geocoding_cache, generic_cache</strong></td>
<td>Expired entries removed by scheduler</td>
<td>By expiry time</td>
</tr>
</tbody>
</table>
<p><code>daily_rollup</code> exists precisely because the retention above is short: the
dashboard charts 30 days of message and packet activity from tables pruned at 7
and 3 days respectively. One row per day is roughly 200 bytes, so a year of
history costs well under a megabyte. Pruning it is handled by the web viewer's
snapshot refresher rather than the bot scheduler, because the viewer may point
at a different database file.</p>
<p>Note that cleanup also removes rows dated implausibly far in the <strong>future</strong>.
A node with a bad clock can write a timestamp years ahead; because such a row is
never older than the cutoff, a lower-bound-only delete would keep it forever and
stretch every chart axis to match.</p>
<p>Shorter retention (e.g. 2–3 days for <code>packet_stream</code>) is enough for the web viewer and transmission_tracker; longer retention is only needed if you want more history.</p>
<h2 id="how-cleanup-runs">How cleanup runs</h2>
<ol>
<li>The <strong>scheduler</strong> (in the main bot process) runs a single data-retention task on a <strong>24-hour interval</strong> after startup (the first run is not immediate on boot; it aligns with the nightly maintenance email cadence).</li>
<li>That task:</li>
<li>Cleans <strong>packet_stream</strong> (via web viewer integration when enabled).</li>
<li>Cleans <strong>purging_log</strong>, <strong>daily_stats</strong>, <strong>unique_advert_packets</strong>, and <strong>observed_paths</strong> (repeater manager).</li>
<li>Cleans <strong>message_stats</strong>, <strong>command_stats</strong>, <strong>path_stats</strong> (stats command’s <code>cleanup_old_stats</code>).</li>
<li>Removes expired rows from <strong>geocoding_cache</strong> and <strong>generic_cache</strong> (DB manager).</li>
<li>Deletes old rows from <strong>mesh_connections</strong> (mesh graph).</li>
</ol>
<p>So as long as the bot is running, the database is pruned on a schedule regardless of whether you run the standalone web viewer or the stats command.</p>
<p><strong>Log files</strong> (<code>[Logging] log_file</code>, e.g. <code>meshcore_bot.log</code>) use rotating file logging: the bot rotates at 5 MB and keeps up to 3 backup files (same policy as the web viewer), so log disk use stays bounded.</p>
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