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Louis King
cf5add9924
Dashboard charts (activity, message-activity, node-count) rendered as flat zeros on Postgres because func.date() returns a str on SQLite but a datetime.date on Postgres — the dict lookup by string key always missed. Fixed with a dialect-neutral _date_bucket_key() helper and pinned the Postgres session timezone to UTC at the engine level. Also adds dual-backend test infrastructure (TEST_DATABASE_BACKEND env var), per-worker Postgres databases for pytest-xdist isolation, and strengthened regression tests asserting non-zero date buckets.