Delete row sig_dca257f98d6b from signals

id sig_dca257f98d6b
event_id evt_b13962ee4a19
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_5cf8588e3 ...
dedupe_key signal_enriched:news_delta:9a74aec2ee76283c
throttle_s 0
created_at 2026-04-12T03:16:46.849506+00:00
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