Delete row sig_89c88fd6952f from signals

id sig_89c88fd6952f
event_id evt_ca3e4083a119
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T15:15:23.171542+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:cf980e76b6514f18
throttle_s 0
created_at 2026-04-22T15:15:23.171542+00:00
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