Delete row sig_2c308e2c98aa from signals

id sig_2c308e2c98aa
event_id evt_3eb9cde40d02
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_86eab73c0 ...
dedupe_key signal_enriched:news_delta:f3a433f10547b02b
throttle_s 0
created_at 2026-04-15T06:03:51.273440+00:00
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