Delete row sig_8970e77affaa from signals

id sig_8970e77affaa
event_id evt_50fc0e7bef2d
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:d642b0cb526b40d5
throttle_s 0
created_at 2026-04-09T17:20:49.115654+00:00
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