Delete row sig_e77ecb40fae0 from signals

id sig_e77ecb40fae0
event_id evt_09f27474bb19
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_6612484f3 ...
dedupe_key signal_enriched:news_delta:483aa8f267ddba91
throttle_s 0
created_at 2026-04-18T19:32:52.172421+00:00
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