Delete row sig_4309aaa119db from signals

id sig_4309aaa119db
event_id evt_84c016dd06be
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T02:17:31.052873+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c5d1960ef159f6e3
throttle_s 0
created_at 2026-04-20T02:17:31.052873+00:00
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