Delete row sig_100487ec19fa from signals

id sig_100487ec19fa
event_id evt_5ae412416450
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_e52474738 ...
dedupe_key signal_enriched:market_headline_delta:203a5cc76754 ...
throttle_s 0
created_at 2026-04-22T12:19:20.559483+00:00
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