Delete row sig_e548e927ca71 from signals

id sig_e548e927ca71
event_id evt_3198fe2d66dd
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_6e217b0fe ...
dedupe_key signal_enriched:news_delta:6dde6be49fa11c78
throttle_s 0
created_at 2026-04-18T22:33:11.863243+00:00
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