This is not how government databases work. Government is optimized to produce as much papertrail as possible in a lot of different places, including actual paper in a huge journal, listing the entries in the order of their acceptance.
Database is just the cache of current state of things for convenience, but all the events that contributed into reaching this final state are also recorded somewhere multiple times and those pieces of trail capture a lot of duplicate information regarding the previous state of system.
Government itself (as big G) doesn't tamper with data really. There is no point to tamper with data if you can control the rules to reach the final state and can legitimately feed events into it. Individual employees do tamper with data all the time and eventually get caught if somebody else cares enough to point it out and dig enough papertrail to make a point.
Database is just the cache of current state of things for convenience, but all the events that contributed into reaching this final state are also recorded somewhere multiple times and those pieces of trail capture a lot of duplicate information regarding the previous state of system.
Government itself (as big G) doesn't tamper with data really. There is no point to tamper with data if you can control the rules to reach the final state and can legitimately feed events into it. Individual employees do tamper with data all the time and eventually get caught if somebody else cares enough to point it out and dig enough papertrail to make a point.