Delete row sig_ac46dd363ea2 from signals

id sig_ac46dd363ea2
event_id evt_ba4557cc5848
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T02:27:55.744530+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:2d51dab9f1c5c8b9
throttle_s 0
created_at 2026-04-09T02:27:55.744530+00:00
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