Delete row sig_a8ae9ead35c2 from signals

id sig_a8ae9ead35c2
event_id evt_d17bb51ec632
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T06:40:09.606665+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cac02689a991cd7f
throttle_s 0
created_at 2026-04-11T06:40:09.606665+00:00
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