Delete row sig_e68681760f6c from signals

id sig_e68681760f6c
event_id evt_18eff7206dc9
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_cb1d1e850 ...
dedupe_key signal_enriched:news_delta:76fb3f18169eb216
throttle_s 0
created_at 2026-04-13T11:10:14.385911+00:00
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