Delete row sig_8aa7344a082b from signals

id sig_8aa7344a082b
event_id evt_239a4f711659
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T09:25:56.739885+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bc7ee0a16d975d34
throttle_s 0
created_at 2026-04-20T09:25:56.739885+00:00
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