Delete row sig_8975244f50a5 from signals

id sig_8975244f50a5
event_id evt_b5fca62bac2f
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:52777720803b613d
throttle_s 0
created_at 2026-04-22T05:14:49.294757+00:00
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