# System

## System

<div data-full-width="true"><figure><img src="https://content.gitbook.com/content/Nyvwhz1kEMXcHf4HLuZ8/blobs/aQSHB9zh52CUKST0zqp2/System.png" alt=""><figcaption></figcaption></figure></div>

<table data-header-hidden data-full-width="true"><thead><tr><th width="60"></th><th width="178"></th><th></th></tr></thead><tbody><tr><td><strong>[A]</strong></td><td>Host</td><td>Enter the hostname.</td></tr><tr><td><strong>[B]</strong></td><td>System Owner</td><td>System administrator with full permissions. Required for system notifications.</td></tr><tr><td><strong>[C]</strong></td><td>Default language</td><td>Sets the display language of Eliona (German, English, Italian, French).</td></tr><tr><td><strong>[D]</strong></td><td>Primary color</td><td>Defines the main color of the system controls.</td></tr><tr><td><strong>[E]</strong></td><td>System logo</td><td>Allows uploading a custom logo for the system.</td></tr><tr><td><strong>[F]</strong></td><td>Version</td><td>Displays the currently installed and the latest available version of Eliona.</td></tr><tr><td><strong>[G]</strong></td><td>Audit Log Limit</td><td>If disabled, audit logs are stored indefinitely. If enabled, storage is based on "Storage Time Log".</td></tr><tr><td><strong>[H]</strong></td><td>Storage Time Log</td><td>Defines how long logs are retained before they are automatically deleted.</td></tr><tr><td><strong>[I]</strong></td><td>Storage Time Trend</td><td>Defines how long trend data is stored.</td></tr><tr><td><strong>[J]</strong></td><td>Smart Batch Mode</td><td><p>Data processing control:</p><ul><li><strong>Plain:</strong> Data is inserted individually and immediately.</li><li><strong>Batch:</strong> Data is collected for a configured period of time and then saved as a single query.</li><li><strong>Smart Batch:</strong> Similar to Batch, but only the last value for frequently changing data is stored.</li></ul><p></p></td></tr><tr><td><strong>[K]</strong></td><td>Cold Storage</td><td>Specifies when trend data is converted to a more space-saving format to reduce storage space.</td></tr><tr><td><strong>[L]</strong></td><td>Storage Time From</td><td>If <strong>Cold Storage</strong> enabled, you can define the period after which the data is moved to cold storage.</td></tr><tr><td><strong>[M]</strong></td><td>Web server certificate</td><td>Displays the current status of the stored certificate. Using the button <strong>Update</strong> new certificate files (.crt / .key) can be uploaded. After the replacement, the Eliona instance is automatically restarted and is again accessible via a secure HTTPS connection.</td></tr></tbody></table>

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To receive system notifications, a *System Owner* (system administrator) must be entered. System notifications provide information about communication issues, API parameters, and other system-critical information.
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To set the data retention period to **unlimited** please contact our team.
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