Delete row sig_b65883f463aa from signals

id sig_b65883f463aa
event_id evt_18b361afcadc
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T06:52:06.605091+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a82f7f27fb3fdb46
throttle_s 0
created_at 2026-04-18T06:52:06.605091+00:00
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