Delete row sig_28bd6f850547 from signals

id sig_28bd6f850547
event_id evt_4230e2fc61df
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T20:13:28.692859+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:3c1a5b788d37b66f
throttle_s 0
created_at 2026-04-20T20:13:28.692859+00:00
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