WASHINGTON — When a Russian intelligence service told the CIA that Tamerlan Tsarnaev had become an Islamic radical looking to join underground groups, the agency put his name in the government´s catch-all database for terrorism suspects. The Terrorist Identities Datamart Environment list, known as TIDE, was the government´s attempt after the Sept. 11 attacks to consolidate a hodgepodge of watch lists, and ensure that every law enforcement agency would be alerted when it came into contact with a possible terrorist. But TIDE has ballooned to 875,000 records, and critics say it is so all-encompassing