Delete row sig_539505a45365 from signals

id sig_539505a45365
event_id evt_648b1f48bc3a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T07:00:33.136961+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:f755893d3a09389c
throttle_s 0
created_at 2026-04-21T07:00:33.136961+00:00
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