Delete row sig_8f9e6253e73f from signals

id sig_8f9e6253e73f
event_id evt_1bedf543c22d
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:57daacb42574167d
throttle_s 0
created_at 2026-04-20T16:34:41.871419+00:00
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