Delete row sig_d9f424213925 from signals

id sig_d9f424213925
event_id evt_6ae66ca1a713
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T07:29:55.687200+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:47cd1813c253ae1f
throttle_s 0
created_at 2026-04-20T07:29:55.687200+00:00
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