Delete row sig_b6d2608ad09b from signals

id sig_b6d2608ad09b
event_id evt_e4c1c26c8d96
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T21:09:36.365566+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:44eeb3017799a782
throttle_s 0
created_at 2026-04-12T21:09:36.365566+00:00
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