Delete row sig_f8c7e18f819e from signals

id sig_f8c7e18f819e
event_id evt_10dad243fe75
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T08:39:00.480438+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b39a58764e5cdd74
throttle_s 0
created_at 2026-04-18T08:39:00.480438+00:00
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