Delete row sig_fa1b19b2eab9 from signals

id sig_fa1b19b2eab9
event_id evt_b9ffba362190
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_39f83b713 ...
dedupe_key signal_enriched:news_delta:91f7c1f5c9189d2c
throttle_s 0
created_at 2026-04-17T16:09:34.412203+00:00
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