Delete row sig_998bc8576c05 from signals

id sig_998bc8576c05
event_id evt_dd517beea89d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T22:33:27.470669+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1773a22cdbe80619
throttle_s 0
created_at 2026-04-09T22:33:27.470669+00:00
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