How do I properly migrate an osTicket database from one server to another?

Use native mysqldump or mariadb-dump from the command line -- this handles binary data (attachments stored as blobs) correctly. MySQL Workbench exports may corrupt binary data unless the binary export option is explicitly checked. After importing, update the Helpdesk URL in Admin Panel > Settings > System to the new server URL. If using OAuth2, also update the Redirect URIs in your Azure/Google app registration to the new URL and re-authorize each email account in osTicket.