Delete row sig_5216936a3195 from signals

id sig_5216936a3195
event_id evt_ae9b4556856b
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_54850a46b ...
dedupe_key signal_enriched:news_delta:7ccba9447c7f82c0
throttle_s 0
created_at 2026-04-12T11:23:23.465647+00:00
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