Delete row sig_384471997d58 from signals

id sig_384471997d58
event_id evt_1bad0f1a990d
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_e81ec6f76 ...
dedupe_key signal_enriched:market_headline_delta:52214ccb7c46 ...
throttle_s 0
created_at 2026-04-09T18:49:35.310952+00:00
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