Delete row sig_9f8794c010f7 from signals

id sig_9f8794c010f7
event_id evt_429216025a1d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T11:24:53.204961+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:01d23d415c0aa732
throttle_s 0
created_at 2026-04-22T11:24:53.204961+00:00
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