Delete row sig_ffa2ead9c882 from signals

id sig_ffa2ead9c882
event_id evt_6c164552ca33
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T04:56:54.876746+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:eb43c4d223081ecf
throttle_s 0
created_at 2026-04-20T04:56:54.876746+00:00
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