Delete row sig_77c261c4a1ce from signals

id sig_77c261c4a1ce
event_id evt_432e5a688788
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_5036332ef ...
dedupe_key signal_enriched:discovery_ipo_delta:6fced760043067 ...
throttle_s 0
created_at 2026-04-19T00:47:45.189143+00:00
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