Delete row sig_ff74c83d3919 from signals

id sig_ff74c83d3919
event_id evt_db321dde1e14
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:fe5e11acc17a0c62
throttle_s 0
created_at 2026-04-18T13:45:54.833669+00:00
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