Delete row sig_4527339af3eb from signals

id sig_4527339af3eb
event_id evt_b91df3a4e2cb
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T07:33:09.991860+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:51d87b7eea33d012
throttle_s 0
created_at 2026-04-09T07:33:09.991860+00:00
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