Delete row sig_fc7bb93280d5 from signals

id sig_fc7bb93280d5
event_id evt_b21f3125a07c
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_ddba6a1fe ...
dedupe_key signal_enriched:news_delta:d3a02cfc1a3c5057
throttle_s 0
created_at 2026-04-08T23:28:56.284502+00:00
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