Delete row sig_8a3b6cc276de from signals

id sig_8a3b6cc276de
event_id evt_720a7803f528
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_0f64c8a8d ...
dedupe_key signal_enriched:market_headline_delta:f18cfed03aee ...
throttle_s 0
created_at 2026-04-17T14:05:35.702484+00:00
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