Delete row sig_e502cd17f3ad from signals

id sig_e502cd17f3ad
event_id evt_a336acc8f96b
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_e3dc9f1c2 ...
dedupe_key signal_enriched:discovery_ipo_delta:e7a2e9c24ad07f ...
throttle_s 0
created_at 2026-04-19T09:46:35.333003+00:00
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