Delete row sig_4d0347d883d9 from signals

id sig_4d0347d883d9
event_id evt_91bcdc44318d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T19:00:23.005605+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:75ac38a9876de874
throttle_s 0
created_at 2026-04-13T19:00:23.005605+00:00
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