Delete row sig_7b8670eaceee from signals

id sig_7b8670eaceee
event_id evt_16e7dd87bb91
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:27:17.109220+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5d099630b68a48b9
throttle_s 0
created_at 2026-04-09T23:27:17.109220+00:00
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