Delete row sig_ecf6e26021b8 from signals

id sig_ecf6e26021b8
event_id evt_5dcf77f36903
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_3ae9b618b ...
dedupe_key signal_enriched:news_delta:3129a122429474f6
throttle_s 0
created_at 2026-04-19T11:09:37.654570+00:00
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