Delete row sig_e341fe613350 from signals

id sig_e341fe613350
event_id evt_0ab4be18d047
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-22T04:07:09.423580+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9c13a34f5b245c09
throttle_s 0
created_at 2026-04-22T04:07:09.423580+00:00
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