Delete row sig_18228ff6faaf from signals

id sig_18228ff6faaf
event_id evt_1341a1a57d63
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_ed64c2405 ...
dedupe_key signal_enriched:news_delta:86af23e1f14cd9ff
throttle_s 0
created_at 2026-04-17T19:38:48.968423+00:00
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