Delete row sig_8d5ff3f54b61 from signals

id sig_8d5ff3f54b61
event_id evt_5781f81a8d73
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T04:58:07.203959+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b0cac35482479d18
throttle_s 0
created_at 2026-04-18T04:58:07.203959+00:00
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