Buster defaults to the nftables backend with an iptables compatibility shim, so iptables -L and nft list ruleset can show different things and both are telling the truth.…
EXPLAIN reports the plan and the optimiser’s estimates, and the estimates are frequently wrong — a query planned for 40 rows that reads 400,000 looks entirely healthy. The…
The editor re-runs save() on load and compares the result with what is stored in the post. Any difference is a validation error, and the block offers to…
A cycle in the data — a category set as its own ancestor through the admin — recurses until cte_max_recursion_depth stops it with an error, and the default…
One identifier generated at the edge and attached to every log line turns an incident into a single query — and the hop most implementations lose is the…
The @expectedException annotation asserts the exception happened somewhere in the method, which passes when it is thrown by the arrangement rather than by the thing under test. Placing…
Since 7.2 count() warns on anything that is not an array or Countable, and the guard everybody wrote by hand is now in the standard library. A generator…
An entry delivered to a consumer and never acknowledged stays in the pending entries list indefinitely, which is the mechanism that makes recovery possible and the one that…
Anything an effect starts — a subscription, a timer, a fetch, an event listener — outlives the component unless the effect returns something that stops it. The cleanup…