Delete row sig_d42eb1455633 from signals

id sig_d42eb1455633
event_id evt_a6537831779e
watcher_id NULL
signal_type macro_yield_curve_snapshot
value {"as_of":"01/02/2026","date ...
threshold NULL
direction NULL
severity NULL
window NULL
source treasury
reason_trace {}
dedupe_key macro_yield_curve_snapshot:509ac8a5e90fb54f
throttle_s 0
created_at 2026-04-21T08:30:29.975153+00:00
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