Fix flaky testUsernameStatistics timing assertion

[codeling]

Problem

DatabaseHelperTest::testUsernameStatistics failed intermittently in CI, with first_attempt off by one second (21:11:29 expected, 21:11:28 actual).

Cause

The failed-login timestamps are generated from time() when the rows are inserted. The assertions then compared them against a second time() reading taken at assertion time. If a second boundary passed between the two reads, the values differed by one second.

Fix

The test now records time() before and after the inserts. It asserts that the stored first_attempt and last_attempt fall within that window, shifted by 30 and 10 minutes. This holds no matter when the clock ticks over.

Only the test changes; there is no production code change.

Testing

I couldn't run PHPUnit in my environment, only a PHP syntax check (php -l). CI will run the full suite.

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https://claude.ai/code/session_01Qy73oCK2ZQyvqMP9DKoFkN

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