Delete row sig_b84f365497a4 from signals

id sig_b84f365497a4
event_id evt_5d8731ba8a5b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T23:58:02.835506+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6bfd8a971029b895
throttle_s 0
created_at 2026-04-11T23:58:02.835506+00:00
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