Employees in the city of San Diego's treasurer's office – ground zero in federal investigations of city finances – destroyed numerous records last month, prompting a warning from City Manager Lamont Ewell yesterday. The destruction of records was revealed yesterday by City Attorney Michael Aguirre, who said he learned from an unnamed city employee Thursday night that about 20 people in the treasurer's Financing Services division dumped whole files into recycle bins and erased e-mails. The news spurred a terse e-mail from Ewell to "all city employees," warning against the destruction of documents that might be sought by federal investigators...