Delete row sig_4fa331c6c9ca from signals

id sig_4fa331c6c9ca
event_id evt_5f83762ee31c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T08:11:15.503662+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0b54858e76fc09bd
throttle_s 0
created_at 2026-04-20T08:11:15.503662+00:00
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