Delete row sig_89b876679b1f from signals

id sig_89b876679b1f
event_id evt_e611d7a4498e
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T14:14:30.996926+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:c95b7f95b8ba249f
throttle_s 0
created_at 2026-04-21T14:14:30.996926+00:00
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