Delete row sig_c9c9124094e9 from signals

id sig_c9c9124094e9
event_id evt_39b9f4e0aee4
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:00899f67879046cf
throttle_s 0
created_at 2026-04-11T20:22:31.947969+00:00
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