Delete row sig_ee41c9522eac from signals

id sig_ee41c9522eac
event_id evt_40ea91a36e74
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T16:46:22.888191+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:428b8dacfa2119ef
throttle_s 0
created_at 2026-04-13T16:46:22.888191+00:00
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