Delete row sig_783574f6fc18 from signals

id sig_783574f6fc18
event_id evt_ad87ab3f61ab
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_73bc8e720 ...
dedupe_key signal_enriched:market_headline_delta:f1c3c90fe124 ...
throttle_s 0
created_at 2026-04-13T05:10:32.360451+00:00
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