"WTF? These records should have been inserted into the table!"
...Hours of checking code, trying to figure out how this is possible, can't find a way to have this scenario happen...
...Add additional debug and troubleshooting code, add more verbose logging, redeploy to all the containers, reset all the tables, many apologies to the boss for the delay....
...Co-worker comes in: "oh, hey, sorry, accidently deleted some stuff from the database last night before i left."