Delete row sig_2c7a1b7044d5 from signals

id sig_2c7a1b7044d5
event_id evt_b83156206609
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_1b7c66796 ...
dedupe_key signal_enriched:news_delta:aac104c423892917
throttle_s 0
created_at 2026-04-19T07:31:03.498797+00:00
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