Delete row sig_89a77da238e1 from signals

id sig_89a77da238e1
event_id evt_fe766ae6dd1c
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_e6f6c519e ...
dedupe_key signal_enriched:news_delta:49391c8172fd6fd5
throttle_s 0
created_at 2026-04-18T10:33:05.629467+00:00
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