Delete row sig_8956d47f6a5e from signals

id sig_8956d47f6a5e
event_id evt_a4f4c8753534
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:56e97b025ce5b8d0
throttle_s 0
created_at 2026-04-08T08:22:15.201286+00:00
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