Delete row sig_3f2a98457586 from signals

id sig_3f2a98457586
event_id evt_51b0485e842f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T12:37:41.920233+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:41042e97d687111d
throttle_s 0
created_at 2026-04-09T12:37:41.920233+00:00
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