Delete row sig_c302f950c503 from signals

id sig_c302f950c503
event_id evt_da9afe5f9e6b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T09:14:29.085628+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:62f5f24b5ad48bcd
throttle_s 0
created_at 2026-04-21T09:14:29.085628+00:00
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