Delete row sig_0efaba53ff24 from signals

id sig_0efaba53ff24
event_id evt_89d12bdea447
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:5b85e49e2b3fb336
throttle_s 0
created_at 2026-04-20T00:34:34.377474+00:00
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