In maintenance/postgres/tables.sql, the profiling table should be defined like

In maintenance/postgres/tables.sql, the profiling table should be defined like
this:

CREATE TABLE profiling (
  pf_count   INTEGER         NOT NULL DEFAULT 0,
  pf_time    FLOAT           NOT NULL DEFAULT 0,
  pf_memory  FLOAT           NOT NULL DEFAULT 0,
  pf_name    TEXT            NOT NULL,
  pf_server  TEXT            NULL
);

The current use of NUMERIC(18,10) very rapidly overflows the pf_memory column,
generating errors.  Also, the NUMERIC is very much slower than float, and in
this case it has no advantages.

Bug: 55722
Change-Id: I48b00d55aaed821a4ceb9365033817a3b477d71a