Follow the user objects stats in postgresql

follow_stat.sql

-- first create a schema to store your new table
CREATE SCHEMA dba;

-- create the table
CREATE TABLE dba.log_stat (LIKE pg_stat_user_tables);

--- add a column to timestamp the figures
ALTER TABLE dba.log_stat ADD COLUMN eventtime timestamp with time zone default now();

--- last action insert the stats in the table
INSERT INTO dba.log_stat SELECT * FROM pg_stat_user_tables;