Delete row sig_e7cc5e6b7f49 from signals

id sig_e7cc5e6b7f49
event_id evt_a0afb3fddefd
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_1b49596e2 ...
dedupe_key signal_enriched:discovery_ipo_delta:6872e07983e558 ...
throttle_s 0
created_at 2026-04-19T09:46:35.333003+00:00
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