Delete row sig_15578cb7ecf1 from signals

id sig_15578cb7ecf1
event_id evt_2702331670b7
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_e2e5ea575 ...
dedupe_key signal_enriched:news_delta:4d45c8cdd5174b5a
throttle_s 0
created_at 2026-04-21T01:31:11.752875+00:00
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