Delete row sig_77c6f94169b3 from signals

id sig_77c6f94169b3
event_id evt_8ab3ec735057
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_fc98b8818 ...
dedupe_key signal_enriched:discovery_ipo_delta:e59b1a7e6ab89c ...
throttle_s 0
created_at 2026-04-18T15:49:14.474663+00:00
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