Delete row sig_1216d1291f67 from signals

id sig_1216d1291f67
event_id evt_bdc8e82051ab
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_ff7715e53 ...
dedupe_key signal_enriched:news_delta:2171f2e576d04f45
throttle_s 0
created_at 2026-04-17T23:34:43.594160+00:00
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