Delete row sig_686372364761 from signals

id sig_686372364761
event_id evt_87b5b5db6755
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:9ef9f7001f5cc786
throttle_s 0
created_at 2026-04-09T12:52:06.336813+00:00
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