Delete row sig_9290c706345b from signals

id sig_9290c706345b
event_id evt_a523faed54d0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T09:25:29.815414+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8773f837625c614b
throttle_s 0
created_at 2026-04-19T09:25:29.815414+00:00
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