Delete row sig_d89b7891700d from signals

id sig_d89b7891700d
event_id evt_6ba9db47f747
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T15:12:40.329769+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:52ef6271b8aa5c46
throttle_s 0
created_at 2026-04-18T15:12:40.329769+00:00
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