Delete row sig_4481f95e4379 from signals

id sig_4481f95e4379
event_id evt_d6def09e2848
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T01:12:50.607912+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f1d5f3ba9bd1264b
throttle_s 0
created_at 2026-04-20T01:12:50.607912+00:00
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