Delete row sig_215d07379299 from signals

id sig_215d07379299
event_id evt_321073799b61
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T14:10:47.391012+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:cba168c4c22fa625
throttle_s 0
created_at 2026-04-18T14:10:47.391012+00:00
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