Delete row sig_8cbaab49729c from signals

id sig_8cbaab49729c
event_id evt_eeefe3783264
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T13:54:42.950593+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:564fcaab257bcfd5
throttle_s 0
created_at 2026-04-19T13:54:42.950593+00:00
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