Delete row sig_b64521a0a4a8 from signals

id sig_b64521a0a4a8
event_id evt_f2a371027600
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:18bc6bfca43d1c14
throttle_s 0
created_at 2026-04-20T06:41:56.575118+00:00
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