Delete row sig_27c0d19b6533 from signals

id sig_27c0d19b6533
event_id evt_3e0f22407268
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T08:01:14.004733+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:042b604e9a203963
throttle_s 0
created_at 2026-04-20T08:01:14.004733+00:00
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