This will give you the difference in record counts, not the number of records added. For example:
t + 1: add 5 rows
t + 10: add 5 rows
t + 20: del 20 rows
t + 30: add 5 rows
t + 50: add 10 rows
Your code would give an answer of 5 if $ct1 was obtained at time t. moritz's trigger answer would give a more accurate answer if you actually need the could count [1] of items added, and not just the difference in the row counts.
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