Delete row sig_e2cbed2ccfa5 from signals

id sig_e2cbed2ccfa5
event_id evt_c202cca8a507
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_1b83c9aa1 ...
dedupe_key signal_enriched:news_delta:bdd4e0f6f9471c6c
throttle_s 0
created_at 2026-04-20T11:15:52.201752+00:00
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