Delete row sig_1f0dda33de16 from signals

id sig_1f0dda33de16
event_id evt_69d835c7df09
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:34dc9f7ba5372153
throttle_s 0
created_at 2026-04-08T05:49:44.189050+00:00
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