Delete row sig_e8892b690541 from signals

id sig_e8892b690541
event_id evt_0b83c245a560
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_7a316350f ...
dedupe_key signal_enriched:news_delta:f607f51b2f5e6cb9
throttle_s 0
created_at 2026-04-10T07:49:15.172032+00:00
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