Delete row sig_77ef20ba7bd9 from signals

id sig_77ef20ba7bd9
event_id evt_5fa7751a9e22
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_ac6f68dbb ...
dedupe_key signal_enriched:news_delta:b4481b354dfd66a8
throttle_s 0
created_at 2026-04-13T09:40:13.993146+00:00
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