Graham McIntire 581955bd69 fix: prevent contacts_dedup_idx collisions in parallel async tests ... Create shared ContactsFixtures module with globally-unique qso_timestamp seconds to prevent unique-constraint violations when async test modules run in parallel and insert contacts with identical dedup-key columns. The qso_timestamp column is timestamp(0), so microsecond offsets were truncated — use System.unique_integer monotonic seconds instead. Also make count-asserting tests resilient to sandbox-leaked contacts from prior tests by using >= assertions or status-based checks rather than exact counts. Includes automated DateTime.add → DateTime.shift migration from mix format.		2026-08-04 17:05:16 -05:00
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features.ex	fix: prevent contacts_dedup_idx collisions in parallel async tests	2026-08-04 17:05:16 -05:00