text: DROP TABLE Events;
  DROP TABLE Prefixes;
  
  CREATE TABLE Events (
      id SERIAL UNIQUE NOT NULL,
      time TIMESTAMP NOT NULL,
      server TEXT NOT NULL,
      event TEXT NOT NULL,
      serialNo INTEGER -- if NULL, serial number unknown (typically at the beginning of a session)
  );
  
  CREATE TABLE Prefixes (
      id SERIAL UNIQUE NOT NULL,
      time TIMESTAMP NOT NULL,
      announce BOOLEAN, -- FALSE if withdraw
      prefix CIDR,
      maxLength INTEGER, -- if NULL, use the length of the prefix
      serialNo INTEGER -- if NULL, serial number unknown (typically at the beginning of a session)
  );
  