Delete row sig_2dcffed16f26 from signals

id sig_2dcffed16f26
event_id evt_2366a391758e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T05:25:09.063979+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:e69204d2fe7b16b9
throttle_s 0
created_at 2026-04-11T05:25:09.063979+00:00
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