Delete row sig_4477ec07b871 from signals

id sig_4477ec07b871
event_id evt_ab071ddbc0a3
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:5447904aa94f4f11
throttle_s 0
created_at 2026-04-20T10:16:21.201795+00:00
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