Option 1:
Minimum value validation coming from database - Refer below screenshot.
https://pasteboard.co/MRycx66JJPzM.png
You can also change value from database
SELECT TOP (1000) [KeyID]
,[KeyName]
,[KeyDisplayName]
,[KeyDescription]
,[KeyValue]
,[KeyType]
,[KeyCategoryID]
,[SiteID]
,[KeyGUID]
,[KeyLastModified]
,[KeyOrder]
,[KeyDefaultValue]
,[KeyValidation]
,[KeyEditingControlPath]
,[KeyIsGlobal]
,[KeyIsCustom]
,[KeyIsHidden]
,[KeyFormControlSettings]
,[KeyExplanationText]
FROM [K11eCommerce].[dbo].[CMS_SettingsKey] WHERE KeyName like '%contact%' and KeyID=70072
You can modify the validation rule using update query and update the [KeyValidation] with your own validation rule.
it helps you.