Delete row sig_7aa6e56d8788 from signals

id sig_7aa6e56d8788
event_id evt_f8ba12c2c417
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_1ad97056f ...
dedupe_key signal_enriched:news_delta:eb7571c381caec07
throttle_s 0
created_at 2026-04-20T20:05:38.951334+00:00
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