Delete row sig_1f3cebb7874e from signals

id sig_1f3cebb7874e
event_id evt_4eaa9a4b3f0f
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:1730af8e62ec615b
throttle_s 0
created_at 2026-04-17T22:00:46.170647+00:00
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