Delete row sig_77dda8ce8bd0 from signals

id sig_77dda8ce8bd0
event_id evt_c3b532a3c1af
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:e509ce0ffeadf9b5
throttle_s 0
created_at 2026-04-06T23:46:33.826070+00:00
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