large number (bigint) for post ID issue in database

The ID field in the wp_post table should be an UNSIGNED BIGINT in MySQL.

That means it can store values from 0 to 18,446,744,073,709,551,615 ((2^64)-1).

See the MySQL documentation article for that.

Your value of 796,978,707,878,960,002 is a not bigger than the allowed maximum value.
So in theory it should be able to handle that ID value, but the database clearly cannot handle values that big.

Check on the database: which version are you using, is it really an UNSIGNED BIGINT on your end?

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