Delete row sig_9954fb6889a1 from signals

id sig_9954fb6889a1
event_id evt_8df70e91e96c
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T23:11:06.957007+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:90c6b3ea06ad1725
throttle_s 0
created_at 2026-04-18T23:11:06.957007+00:00
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