Delete row sig_d2b4ae8a5e56 from signals

id sig_d2b4ae8a5e56
event_id evt_cac804a9ccac
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T15:24:22.719842+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:76de5c27e88c0505
throttle_s 0
created_at 2026-04-19T15:24:22.719842+00:00
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