Delete row sig_90e3c649ab71 from signals

id sig_90e3c649ab71
event_id evt_6406a0a54ba8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T14:14:51.045014+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:88d7653ec4ba7aab
throttle_s 0
created_at 2026-04-20T14:14:51.045014+00:00
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