Delete row sig_c8aae2c07a90 from signals

id sig_c8aae2c07a90
event_id evt_af5b700af185
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_ff4166008 ...
dedupe_key signal_enriched:news_delta:1d9fc0b3f53f4768
throttle_s 0
created_at 2026-04-09T15:01:33.815292+00:00
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