Delete row sig_89ab3778dcd5 from signals

id sig_89ab3778dcd5
event_id evt_ecb749cc3dc2
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_18f3ca34e ...
dedupe_key signal_enriched:market_headline_delta:ee1ae4a44327 ...
throttle_s 0
created_at 2026-04-20T04:02:39.755229+00:00
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