Delete row sig_e915f7792138 from signals

id sig_e915f7792138
event_id evt_9986593cd4c4
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_1ae2dd4af ...
dedupe_key signal_enriched:market_headline_delta:d8757ee4724d ...
throttle_s 0
created_at 2026-04-16T23:58:22.146775+00:00
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