Delete row sig_3aa4e73bad96 from signals

id sig_3aa4e73bad96
event_id evt_69863e128407
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:b69716ca80888121
throttle_s 0
created_at 2026-04-14T19:34:59.423808+00:00
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