Delete row sig_ad8efd8a8c96 from signals

id sig_ad8efd8a8c96
event_id evt_3b9bfeaf6139
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T19:15:38.033834+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a13b06a505d6114d
throttle_s 0
created_at 2026-04-19T19:15:38.033834+00:00
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