Delete row sig_8bdb95c4d69a from signals

id sig_8bdb95c4d69a
event_id evt_46d675a9d419
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:00fa50c3a39a8f22
throttle_s 0
created_at 2026-04-19T22:31:26.732862+00:00
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